WO2017126105A1 - Download system, communication device, download method, and computer program - Google Patents

Abstract

[Problem] To reduce processing load on a server device which stores a file, when segmenting and downloading the file. [Solution] A primary storage server 10 carries out a call for data via threads 14a - 14d to a secondary storage server 20 which stores a file 15 to be downloaded, said data being included in a first region 15a through a fourth region 15d of the file 15. The secondary storage server 20 reads out data 150a - 150d from each of the regions 15a - 15d based on the call, and transmits said data to the primary storage server 10 via the threads 14a - 14d. The primary storage server 10 stores the each of the received instances of data 150a - 150d in a first storage region 15a through a fourth storage region 15d of a stored file 15.

Description

Download system, communication device, download method, and computer program

The present invention relates to a download system, a communication device, a download method, and a computer program that can reduce the processing load on the server device side that records a file to be downloaded when the file is divided and downloaded.

Conventionally, a file stored in a server device such as a storage server is generally downloaded via a network. In addition, when the file to be downloaded has a large capacity, etc., the file to be downloaded is generally divided and downloaded. In this case, the file is divided to reduce the time required for downloading. The divided files are also downloaded by parallel processing.

In Patent Document 1, a file server that stores an original file to be downloaded divides the original file into a plurality of files, and downloads each divided file to a client terminal in parallel through a plurality of data connections. The terminal discloses that when the downloading of a plurality of files is completed, the original files are generated by combining the files.

Also, the following Patent Document 2 discloses that a file stored in a file server is divided into a plurality of areas, and data transfer of the divided areas is performed in parallel. Furthermore, Patent Document 3 below discloses that data to be transmitted is divided when a server transfers data to a client. Furthermore, Patent Document 4 below discloses that the download server device divides a file to be downloaded into a plurality of sectors and transmits the positions of the files in each sector to a plurality of terminals in pairs with the sectors. Is done.

On the other hand, a system in which a plurality of storage servers are linked in a network to store a file has been conventionally used (for example, a system according to HSM (Hierarchical Storage Management) in which a plurality of storages are hierarchically provided) In such a system, a dummy file (or stub file) may be used. The dummy file is a file with a reduced data capacity that does not include the actual data, and is generally stored in the first storage server (primary storage server) on the side that receives access from the user, and corresponds to the dummy file. The actual file including the actual data is stored in the second storage server (secondary storage server) linked with the first storage server, thereby securing the free capacity of the first storage server. Such a dummy file is often used for an image file having a large capacity.

The dummy file appears to the user accessing the primary storage server as if the original file was stored in the primary storage server, and when the primary storage receives a read request from the user, the actual file Therefore, the dummy file usually includes information indicating the storage location of the actual file, information indicating the size capacity of the actual file, and the like.

Examples of processing for downloading an actual file using such a dummy file (stub file) are shown in Patent Documents 5 and 6 below. In Patent Document 7 below, when downloading a stored file, the file storage side divides the file to be downloaded into N pieces, the receiving apparatus generates a dummy file, and the file write area It is disclosed to ensure the above.

Japanese Patent Laid-Open No. 11-242640 Japanese Patent Laid-Open No. 11-15720 JP 2001-350683 A Japanese Patent Application Laid-Open No. 2004-287731 JP-A-8-314789 JP 2006-164211 A JP 2000-322309 A

In Patent Documents 1 to 4 described above, when a file to be downloaded is divided and transmitted, it is necessary to perform file division processing on a file transmission source device (such as a file server) that stores the file. In the original apparatus, there is a problem that a processing load is generated according to the file division processing. Further, as shown in Patent Document 7, when a dummy file is used and a file to be downloaded is divided, the file dividing process is also performed on the side of the file transmission source device that stores the file to be downloaded. A corresponding processing burden arises.

The present invention has been made in view of such circumstances, and an apparatus on the side of receiving a file specifies a file as a plurality of areas and calls data included in each area, thereby allowing a file such as a file server to be It is an object of the present invention to provide a download system, a communication device, a download method, and a computer program that do not require a transmission source device to perform file division processing.

In addition, when downloading a real file corresponding to a dummy file, a download system and a communication device which do not require the device on the side of providing the real file to perform division processing when the real file is divided and downloaded. An object is to provide a download method and a computer program.

In order to solve the above problems, a download system according to the present invention is a download system comprising a server device and a communication device for downloading a file stored in the server device, wherein the communication device has a capacity of a file to be downloaded. Means for transmitting confirmation information for confirming to the server device, and when the server device receives the confirmation information, the server device performs processing for transmitting notification information to notify the capacity of the file to the communication device. The communication device further includes means for specifying a plurality of areas for dividing the file to be downloaded based on the capacity of the file notified by the notification information when receiving the notification information, and a plurality of specified areas. A means for generating a storage file containing a plurality of corresponding storage areas, and a file to be downloaded Means for performing a process of transmitting request information for requesting data to the server device so as to simultaneously download the data included in each of the plurality of areas according to the simultaneously processable number, the server device comprising: Further, when the request information is received, the communication device includes means for performing processing for simultaneously transmitting the data included in each of the plurality of areas in the file to be downloaded to the communication device according to the simultaneously processable number, The apparatus further includes means for storing each received data in each storage area of the storage file corresponding to each area in which each received data is received when each data is received. It is characterized by providing.

The download system according to the present invention includes a communication device that stores a dummy file and a server device that stores a real file corresponding to the dummy file, and the dummy file has a file capacity compared to the real file. In the download system in which the communication device downloads the actual file from the server device, the communication device includes the actual information indicated by the capacity information included in the dummy file. Means for identifying a plurality of areas into which the actual file is divided based on the capacity of the file; means for expanding the capacity of the dummy file so as to include a plurality of storage areas corresponding to the specified areas; Number of data that can be processed simultaneously in each of the multiple areas in the file Therefore, it comprises means for performing processing for transmitting request information for requesting data to the server device so as to be downloaded simultaneously, and when the server device receives the request information, the plurality of areas in the real file Means for simultaneously transmitting the data included in each of the data to the communication device according to the simultaneously processable number, and the communication device further receives each data when each data is received. A means for storing each received data in each storage area of the dummy file corresponding to each included area is provided.

The communication apparatus according to the present invention includes a means for performing processing for transmitting confirmation information for confirming a capacity of a file to be downloaded to an external server apparatus in a communication apparatus for downloading a file stored in the external server apparatus, and a confirmation In response to the transmission of information, when notification information for notifying the file size is received from an external server device, a plurality of areas for dividing the file to be downloaded are specified based on the file size notified by the notification information Means for generating a storage file including a plurality of storage areas corresponding to the plurality of specified areas, and simultaneously downloading data included in each of the plurality of areas in the file to be downloaded according to the number that can be processed simultaneously The process of transmitting the request information for requesting data to an external server device In response to the transmission of the request information, when each data is received from an external server device, each received data is stored in each storage area of the storage file corresponding to each area in which each received data is included. And means for performing processing for storing each of the data.

A communication device according to the present invention stores a dummy file and downloads a real file corresponding to the dummy file from an external server device. The dummy file has a file capacity compared to the real file. Means for specifying a plurality of areas for dividing the actual file based on the capacity of the actual file indicated by the capacity information included in the dummy file, Means for expanding the capacity of the dummy file so as to include a plurality of storage areas corresponding to the area, and simultaneously downloading the data included in the plurality of areas in the real file according to the simultaneously processable number Means for performing processing for transmitting request information for requesting data to an external server device In response to transmission of request information, when each data is received from an external server device, each received data is stored in each storage area of the dummy file corresponding to each area in which each received data is included. And a means for performing processing for storing each of the above.

The communication apparatus according to the present invention includes means for generating the same number of threads that can be processed simultaneously, transmits request information for each generated thread, and receives data for each generated thread. It is characterized by that.
Further, the communication device according to the present invention is configured such that a thread for transmitting a plurality of request information is generated when the number of the plurality of specified areas exceeds the simultaneously processable number, and each of the plurality of request information Is characterized by requesting data contained in different areas.
Furthermore, in the communication apparatus according to the present invention, when the number of the plurality of specified areas exceeds the number of simultaneously processable threads, a thread for transmitting request information for requesting data included in the plurality of different areas is generated. It is characterized by that.

In the communication apparatus according to the present invention, the means for specifying the plurality of areas is configured to specify a plurality of areas based on a file capacity and a division size, and the means for receiving a numerical value related to the division size is received. Means for setting a numerical value as the division size.
The communication apparatus according to the present invention is characterized in that the request information includes information for designating a position range related to the specified area.

The download method according to the present invention includes a step of performing a process of transmitting confirmation information for confirming a capacity of a file to be downloaded to the external server device in the download method in which the communication device downloads the file from the external server device. In response to the transmission of the confirmation information, when notification information for notifying the file size is received from an external server device, a plurality of areas for dividing the file to be downloaded are divided based on the file size notified by the notification information. A step of specifying, a step of generating a storage file including a plurality of storage areas corresponding to the plurality of specified areas, and data included in each of the plurality of areas in the file to be downloaded simultaneously according to the number of simultaneously processable Request information requesting data externally to be downloaded to When each data is received from the external server device in response to the transmission of the request information and the step of transmitting to the server device, each of the storage file corresponding to each area in which each data was included And a step of performing a process of storing each received data in the storage area.

The download method according to the present invention is a download method in which a communication device that stores a dummy file downloads an actual file corresponding to the dummy file from an external server device. Specifying a plurality of areas having a small capacity and including capacity information indicating the capacity of the actual file, and dividing the actual file based on the capacity of the actual file indicated by the capacity information included in the dummy file; The step of expanding the capacity of the dummy file so as to include a plurality of storage areas corresponding to a plurality of areas, and simultaneously downloading the data included in each of the plurality of areas in the real file according to the simultaneously processable number Request information to request data from an external server When each data is received from an external server device in response to the transmission of the request information and the step of transmitting to the device, the dummy file corresponding to each area in which each received data is included And a step of storing each received data in each storage area.

A computer program according to the present invention is a computer program for causing a computer having a communication function to perform processing of downloading a file from an external server device. The computer program includes confirmation information for confirming a capacity of a file to be downloaded. When the notification information for notifying the file size is received from the external server device in response to the transmission of the confirmation information and the step of transmitting to the external server device, the file capacity notified by the notification information A step of identifying a plurality of areas into which the file to be downloaded is divided, a step of generating a storage file including a plurality of storage areas corresponding to the plurality of identified areas, and the plurality of areas in the file to be downloaded Data contained in each can be processed simultaneously The process of transmitting request information for requesting data to an external server device so that the data is downloaded simultaneously according to the above, and receiving each data from the external server device in response to the transmission of the request information And a step of performing a process of storing each received data in each storage area of the storage file corresponding to each area in which each of the data has been included.

A computer program according to the present invention is a computer program for causing a computer having a communication function and storing a dummy file to perform a process of downloading an actual file corresponding to the dummy file from an external server device. Includes capacity information indicating that the capacity of the file is smaller than that of the actual file and indicating the capacity of the actual file, and the actual file is stored in the computer based on the capacity of the actual file indicated by the capacity information included in the dummy file. Identifying a plurality of areas to be divided, a step of expanding the capacity of the dummy file to include a plurality of storage areas corresponding to the identified plurality of areas, and a plurality of areas in the real file, respectively The number of data that can be processed simultaneously Therefore, the step of transmitting the request information for requesting data to the external server device so as to download simultaneously, and the reception when each data is received from the external server device in response to the transmission of the request information And a step of executing a process of storing each received data in each storage area of the dummy file corresponding to each area in which each of the data has been included.

In the present invention, when the communication device confirms the capacity of the file to be downloaded, a plurality of areas in the file to be downloaded are identified based on the confirmed capacity, and a plurality of areas corresponding to the plurality of identified areas are identified. A storage file including a storage area is generated, and then, for the file to be downloaded, request information is transmitted to the server device in order to simultaneously call (read) data corresponding to the plurality of specified areas. Thus, by downloading a plurality of data in parallel and storing them in each storage area of the storage file, the communication device can obtain the file to be downloaded. At this time, the server device that stores the file to be downloaded simply sends data corresponding to the request information to the communication device in response to the request information from the communication device, so the file is not divided. The processing load on the server device side does not increase as compared with the conventional file division processing.

In the present invention, the communication device specifies a plurality of areas in the actual file stored in the server device based on the capacity information included in the dummy file, and a plurality of storage areas corresponding to the specified plurality of areas In order to simultaneously call (read) data corresponding to a plurality of specified areas for the real file, the dummy file is expanded to include The data is downloaded in parallel and stored in each storage area of the dummy file, so that the actual file can be obtained by the communication device. At this time, the server device that stores the actual file simply sends the data corresponding to the request information to the communication device in response to the request information from the communication device, so the file is not divided, so the dummy file Even in the case where is used, the processing load on the server device side does not increase as compared with the conventional file division processing.

In the present invention, the number of threads corresponding to the number that can be processed simultaneously is generated, and the request information is transmitted and the data is received for each thread. Can be downloaded simultaneously. Note that a thread means an execution unit of program processing corresponding to parallel processing. In the present invention, in a time division process of download processing, it is virtually generated as an execution unit for simultaneous processing. Yes.

In the present invention, when the number of the specified plurality of areas exceeds the simultaneously processable number, it is not possible to call all the data corresponding to the plurality of areas in one simultaneous process. By creating a thread that sends request information, such a thread can repeat the simultaneous processing and receive all the data, and a large-capacity file (actual file) that exceeds the number that can be processed simultaneously Even so, it can be reliably downloaded using the present invention.

In the present invention, when the number of the specified plurality of areas exceeds the simultaneously processable number, by generating a thread for transmitting request information for requesting data included in the plurality of different areas, In such a thread, the request information is transmitted once, and the data contained in different areas is downloaded sequentially, exceeding the number that can be processed simultaneously without sending the request information multiple times for each thread. A file with a capacity (actual file) can be downloaded reliably.

In the present invention, when specifying a plurality of areas based on the capacity and division size of a file, a numerical value related to the division size is received and the received numerical value is set as the division size. Depending on the actual file) capacity, communication environment, communication congestion at the time of download, etc., the division size can be set appropriately, and the area range for dividing the file (including the actual file) can be changed accordingly. This ensures a flexible download situation.

In the present invention, since the information specifying the position range of the specified area is included in the request information, the data included in the area in the file to be downloaded (or actual file) can be reliably called, The server apparatus side also reads data from the area in which the position range is designated, so that reliable data reading can be performed.

In the present invention, the communication device calls the data corresponding to a plurality of areas in the file to be downloaded from the server device simultaneously, downloads the plurality of data in parallel, and stores each of the generated storage files Since the file is stored in the area, the server device storing the file to be downloaded only reads and transmits the file according to the call from the communication device, and the processing burden associated with the conventional file division processing is reduced. Increase can be avoided.

In the present invention, the communication device calls the data corresponding to the plurality of areas in the real file corresponding to the dummy file from the server device, downloads the plurality of data in parallel, and expands the size. Since it is stored in each storage area of the dummy file, the server device side that stores the actual file only performs the file reading and transmission processing in response to the call from the communication device, even when the dummy file is used. Thus, it is possible to avoid an increase in the processing burden associated with the conventional file division process, and to effectively use the dummy file and obtain the original real file with the communication device.

In the present invention, the number of threads corresponding to the number that can be processed simultaneously is generated, and request information is transmitted and data is received for each thread. Therefore, it is possible to reliably download a plurality of data in units of threads. Can process.
Further, in the present invention, when the number of the specified plurality of areas exceeds the simultaneously processable number, a thread that performs transmission of request information multiple times is generated, so that the simultaneous processing is repeated and all the processes are performed. Data can be received, so even large files (actual files) can be downloaded reliably.
Furthermore, in the present invention, when the number of the specified plurality of areas exceeds the simultaneously processable number, a thread for transmitting request information for requesting data included in the plurality of different areas is generated. In such a thread, the request information can be transmitted once, and the data contained in the different areas can be downloaded sequentially, and with the efficient transmission of request information, a large-capacity file exceeding the number that can be processed simultaneously (actual file) ) Can be downloaded reliably.

In the present invention, when a plurality of areas are specified based on the file capacity and the division size, a numerical value related to the division size is received and the received numerical value is set as the division size. The division range of the file (including the actual file) can be changed as appropriate by appropriately setting the division size of the file, thereby ensuring a flexible download situation.
In the present invention, since the request information includes information specifying the position range of each area, the data included in the area in the file to be downloaded (actual file) can be called reliably, Also, the server device side can cope with the download process by a general read process of reading data included in the area in which the position range is designated.

It is the schematic which shows the whole structure of the download system which concerns on 1st Embodiment of this invention. (A) is a schematic diagram showing a state in which data is called in parallel processing, (b) is a schematic diagram showing a state in which data is downloaded in parallel processing, and (c) is a diagram showing each storage area of a storage file for downloaded data. It is the schematic which shows the state stored. It is the schematic which shows the area | region which divided | segmented the file of download object. It is a block diagram which shows the main internal structures of a primary storage server. It is a functional block diagram which shows each function by an agent. It is a block diagram which shows the main internal structures of a secondary storage server. It is a 1st flowchart which shows the process sequence of the download method which concerns on this invention. (A) is a schematic diagram showing a menu screen for setting the division size, (b) is a schematic diagram showing a case where the division size is enlarged and the number of division areas of the file is reduced, and (c) is a diagram showing the division size being reduced. FIG. 6 is a schematic diagram showing a case where the number of file division areas is increased. (A) is a schematic diagram showing a state in which the number of divided areas of a file exceeds the number of generated threads, and (b) is a time chart showing a case where the simultaneous download process is performed twice. It is a 2nd flowchart which shows the process sequence of the download method in the case of repeating a simultaneous download process in multiple times. It is a block diagram which shows the main internal structures of a user terminal. It is the schematic which shows the schematic structure of the download system which concerns on 2nd Embodiment of this invention. It is the schematic which shows the condition which concerns on the simultaneous download of 2nd Embodiment. It is a 3rd flowchart which shows the process sequence of the download method which concerns on 2nd Embodiment.

FIG. 1 shows an overall outline of a download system 1 according to the first embodiment of the present invention. The download system 1 includes a primary storage server 10 (corresponding to a communication device) and a secondary storage server 20. (Corresponding to a server device). The primary storage server 10 can communicate with the secondary storage server 20 through a network, and uses the secondary storage server 20 as a backup server for storing various files.

The primary storage server 10 of the present embodiment includes a primary storage 11 (first storage device) that has a high read / write speed but a small storage capacity as a storage device, while the secondary storage server 20 has a read / write speed compared to the primary storage 11. Is provided with a secondary storage 21 (second storage device) that is slow but has a large storage capacity. In order to store the file stored in the primary storage 11 in the secondary storage 21, it is transmitted to the secondary storage server 20, The primary storage server 10 performs a process for securing the storage capacity of the primary storage 11 by moving the file stored in the storage 11.

Further, the primary storage server 10 can receive access from the external user terminal 40 used by a general user or the like via the network, and when a request for a file moved to the secondary storage 21 is received from the user terminal 40. The primary storage server 10 performs processing for downloading the target file from the secondary storage server 20. Thus, when downloading a file from the secondary storage server 20, if the capacity of the file to be downloaded is larger than a certain capacity, the file, which is a feature of the present invention, is divided into a plurality of data and simultaneously in time division (time At the same time, the download system 1 performs the download process.

FIGS. 2A to 2C show an outline of a process for downloading a plurality of data constituting a file, which is a feature of the present invention, and the file 15 stored in the secondary storage 20 is downloaded to the primary storage server 10. It represents the flow of situations. First, as shown in FIG. 2A, the primary storage server 10 generates the storage file 5 corresponding to the file 15 to be downloaded, and simultaneously (parallelly) the file 15 to be downloaded in a time division manner. The first thread 14a to the fourth thread 14d for downloading are established (generated), and request information for requesting data is transmitted to each of the threads 14a to 14d, thereby the first area of the file 15 to be downloaded. 15a to the fourth area 15d (refer to FIG. 3) are processed to call data simultaneously (simultaneously) in time.

Next, as shown in FIG. 2B, when the secondary storage server 20 receives the request information corresponding to the data call included in each of the areas 15a to 15d of the file 15, the data 150a to 150d is read from each of the areas 15a to 15d, and the read data 150a to 150d is transmitted to the primary storage server 10 through the threads 14a to 14d used in the call. Note that the process of transmitting the data to be called to the caller apparatus in response to such a data call is a general process for the server apparatus.

As shown in FIG. 2C, when the primary storage server 10 receives the data 150a to 150d sent from the secondary storage server 20 for each of the first thread 14a to the fourth thread 14d, The data 150a to 150d are stored in storage areas (first storage area 15a to fourth storage area 15d) corresponding to the respective data 150a to 150d in the storage file 5. As a result, the storage file 5 has the same contents as the file 15 to be downloaded, and the storage file 5 having such contents can be used as the file 15. Hereinafter, the primary storage server 10 and the like constituting the download system 1 that performs the above processing will be described in detail.

FIG. 4 shows the main internal configuration of the primary storage server 10 (communication device). A server computer is applied to the primary storage server 10 of the present embodiment, and various devices and the like are connected to the MPU 10a that performs overall control and various processes by an internal connection line 10h. Includes a communication module 10b, a RAM 10c, a ROM 10d, an input interface 10e, an output interface 10f, a storage unit 10g, a primary storage 11, and the like.

The communication module 10b is a communication device corresponding to a network connection module and conforms to a required communication standard (for example, a LAN module). The communication module 10b is connected to the network via a required communication device (not shown, for example, a router or the like), enables communication with the secondary storage server 20, and the user terminal 40 outside the system. Communication with is also possible.

The RAM 10c temporarily stores contents and files associated with the processing of the MPU 10a, and the ROM 10d stores programs and the like that define the basic processing contents of the MPU 10a. The input interface 10e is connected to a keyboard 10i, a mouse, and the like for receiving an operation instruction from a system administrator or the like, and transmits the operation instruction received from the system administrator or the like of the primary storage server 10 to the MPU 10a. The output interface 10f is connected to a display 10j (display output device), and outputs contents associated with the processing of the MPU 10a to the display 10j so that a system administrator or the like can check the current processing contents. .

The storage unit 10g stores programs and the like. Specifically, the storage unit 10g stores various programs such as a server program P1 and a processing program P2, and also sets a division threshold f1 and a setting value used in a file download process. The division size f2 and the like are also stored. Note that the division threshold f1 and the division size f2 are set to initial values by default, and the division threshold f1 is set to 300 MB (megabyte, the same applies hereinafter), and the division size f2 is set to 100 MB, for example, as default initial values. (Each value is an example).

Further, the server program P1 stored in the storage unit 10g defines various processes according to the operating system for the server computer. The MPU 10a performs processes based on the specified contents, whereby the primary storage server 10 Serves as a server computer. The processing program P2 is a computer program that defines that the MPU 10a controls various processes of the download method according to the present invention. In each of the processes shown in FIGS. 2 (a) to 2 (c), The content of control processing performed by the primary storage server 10 is programmed. Such a processing program P2 can be installed in the primary storage server 10 through a storage medium (for example, a storage disk such as a DVD) in which the processing program P2 is stored. In the present embodiment, the MPU 10a performs various functions as the agent 12 by defining the control processing content of the MPU 10a with the program content of the processing program P2.

FIG. 5 shows a block diagram of functions performed by the MPU 10a as the agent 12, and the MPU 10a functions as means for performing the contents (1) to (7) in the figure. Specific functions of the agent 12 include “(1) file capacity confirmation function”, “(2) file division determination function”, “(3) division area specifying function”, and “(4) thread generation function”. , “(5) storage file generation function”, “(6) data request function”, and “(7) data storage function”.

The “(1) file capacity confirmation function” is used to confirm the capacity of a file to be downloaded with the secondary storage server 20 when the primary storage server 10 determines to download a file stored in the secondary storage server 20. It is processing. Specifically, the MPU 10a sends confirmation information including an instruction (command or the like) for confirming and inquiring about the capacity of the download target file to the secondary storage server 20 together with information (file name or the like) specifying the download target file. It has a function corresponding to the process of performing transmission control.

When “(2) File division determination function” receives notification information from the secondary storage server 20 in response to the transmission of the confirmation information, the file notified by the notification information is received. When the capacity is compared with the division threshold f1 stored in the storage unit 10g and the file capacity exceeds a set value (for example, 300 MB) of the division threshold f1, the file to be downloaded is divided. It is a function to identify. If the file capacity is equal to or less than the set value of the division threshold f1 (if it does not exceed), the primary storage server 10 will download the file from the secondary storage server 20 without dividing, and there is no such division. When downloading, the processing is the same as in the prior art, so details are not described.

The “(3) division area specifying function” is a process for specifying a plurality of areas into which the file 15 to be downloaded is divided based on the file capacity notified by the notification information. By using the stored setting value of the divided size f2 as the size of the divided region range, the divided region is specified by the file capacity and the divided size f2. Specifically, by sequentially adding a set value (for example, 100 MB) of the division size f2 to the first 0 MB in the file to be downloaded, the start byte and end byte of the area into which the file 15 to be downloaded is divided are set. Thus, the number of areas into which the file is divided and the position range of each area are specified.

As shown in FIG. 3, when the file capacity of the file 15 to be downloaded is 400 MB, 99 MB obtained by adding the set value (100 MB) of the division size f2 to the start byte (0 MB) of the first area (first area 15a) Is determined as the end byte of the first area 15a, the next 100MB is set as the start byte of the second area 15b, and 199MB obtained by adding the set value of the division size f2 to the start byte is also set as the second area 15b. As the end byte of 15b, 200MB following 199MB is set as the start byte of the third area 15c, 299MB added with the set value of the division size f2 is specified as the end byte of the third area 15c, and 300MB following 299MB is specified. 399 MB obtained by adding the set value of the division size f2 as the start byte of the fourth area 15d is set to the fourth area 15 To identify as of the end byte. The position range of each region is determined by such a specific method.

In addition to the above, a plurality of methods are assumed as a method of specifying the area into which the file is divided. For example, in the file 15 to be downloaded, by dividing the file capacity by the division size f2, first, the file It is also possible to specify the position range of each area by specifying the number to divide all 15 areas and then adding the division size sequentially to the start byte of the file. In addition, a lookup table that specifies the position range of the file division area is prepared (a table that specifies the start and end bytes from the first area to the Nth area (N is an integer of 2 or more), and the like. Based on the specified contents, it is also possible to make a specification for specifying a divided area of a file to be downloaded. Thus, when using a lookup table etc., use of division | segmentation size f2 can be abbreviate | omitted.

“(4) Thread generation function” generates a thread so that processing corresponding to the number of areas specified for the file to be downloaded can be performed in parallel in a time-sharing manner (time sharing). (Established for parallel processing). The upper limit of the number of threads to be generated is determined by the processing capacity of the CPU 40a, the capacity of the RAM 10c, and the like. In this embodiment, up to four threads can be generated. For this reason, when the number of divided areas of the file to be downloaded falls within the maximum number of threads that can be generated, this “(4) thread generation function” generates the same number of threads as the number of divided areas of the file.

Therefore, as shown in FIG. 3, when the file 15 to be downloaded is divided into a total of four areas, the first area 15a to the fourth area 15d, the number of threads generated by “(4) thread generation function” is The number is equal to 4 as the number of divided regions (see FIG. 2A, etc.). In this case, with respect to the generated first thread 14a to fourth thread 14d, the first first thread 14a is set for processing with respect to the first area 15a of the file 15 by “(4) Thread generation function”. The second second thread 14b is for processing the second area 15b, the third third thread 14c is for processing the third area 15c, and the fourth fourth thread 14d is for processing the fourth area 15d. Is set.

If the number of divided areas of the file to be downloaded is three, the number of threads to be generated is three. If the number of divided areas of the file to be downloaded is two, the number of threads to be generated is two. When the number of divided areas of the file to be downloaded exceeds the upper limit of the number of threads that can be generated (4 in the present embodiment), the number of threads to be generated becomes the upper limit of 4 (for example, the file to be downloaded) Even when the number of divided areas is six, the number of threads generated in the present embodiment remains four).

The number of threads (number of threads) generated in this way corresponds to the number that can be processed simultaneously in the download system 1, and the number (time that can be processed in parallel by time division between the primary storage server 10 and the secondary storage server 20. Thus, the number that can be processed at the same time) is equal to the number of threads. In this embodiment, the upper limit of the number of threads is set to 4 depending on the processing capacity of the CPU 40a and the capacity of the RAM 10c. However, the upper limit of the number of threads can be generated when using the MPU 10a having a higher processing capacity, the RAM 10c having a larger capacity, It is also possible to increase the upper limit of the number of threads to more than 4 (for example, the number of threads can be 8 or 16, etc.). Note that the processing (downloading processing) of the generated thread 14a and the like is basically performed in the same time zone, but since the processing proceeds independently with each thread, the processing end time may not be the same period. is there.

The “(5) storage file generation function” is a function for generating a storage file for storing the downloaded file. With this function, the download target specified by the “(3) divided area specifying function” described above is used. The storage file 5 (see FIG. 2A) having the first storage area 5a to the fourth storage area 5d corresponding to the first area 15a to the fourth area 15d of the file 15 is generated in the primary storage 11. The correspondence relationship between the areas of both files is set by “(5) storage file generation function”. Specifically, the first storage area 5a of the storage file 5 corresponds to the first area 15a of the file 15 to be downloaded. Hereinafter, the second storage area 5a of the storage file 5 corresponds to the second area 15b of the file 15, the third storage area 5c of the storage file 5 corresponds to the third area 15c of the file 15, and the storage file 5 The fourth storage area 5d is set to correspond to the fourth area 15d of the file 15. Such a storage file 5 has only storage areas 5a to 5d having the same size (same capacity) as the areas 15a to 15d of the file 15 to be downloaded. These storage areas 5a The contents of ˜5d are empty at the time of generation.

The “(6) data request function” is configured to simultaneously execute data corresponding to each area in the file 15 by parallel processing according to the number of threads 14a to 14d generated by the above “(4) thread generation function”. It is a function to call. Note that performing parallel processing at the same time is because time-sharing processing is performed, strictly speaking, each processing is not simultaneous, and some time deviation is allowed. Therefore, the term “simultaneous” is used in the sense of including a slight time shift due to such time-sharing processing.

The specific content of the “(6) data request function” is a data call (so that data included in each of the areas 15a to 15d of the file 15 to be downloaded is downloaded simultaneously according to the simultaneously processable number ( This is a processing function for performing control for the MPU 10 to transmit request information for performing (request) to the secondary storage server 20. In this function, request information is transmitted in parallel processing through each of the threads 14a to 14d, so that the number of simultaneous processing is simultaneous (in this case, the number of simultaneous processing is 4 which is the same as the number of threads). Each data will be called. Each request information includes information for specifying the position range of the area to be called in the file 15 to be downloaded, and an instruction for calling data included in the area of the specified position range.

The information specifying the position range of the area specifies the start byte (start position) and end byte (end position) in the area range specified by the “(3) division area specifying function” above. Thereby, it becomes possible to call up data included in the position range of the designated area.

“(7) Data storage function” indicates that data included in the first area 15a to the fourth area 15d is transmitted from the secondary storage server 20 in response to the transmission of the request information by “(6) Data request function” described above. When the data is downloaded through the threads 14a to 14d, the data is received, and the received data is stored in the storage areas 5a of the storage file 5 generated by the “(5) storage file generation function”. It becomes a function to store each in 5d. At this time, the first data 150a included in the first area 15a is stored in the first storage area 5a corresponding to the first area 15a. Hereinafter, the second data 150b is stored in the second area 15a. Stored in the second storage area 5b corresponding to 15b, the third data 150c is stored in the third storage area 5c corresponding to the third area 15c, and the fourth data 150d is stored in the fourth area 15d. It is stored in the corresponding fourth storage area 5d.

The storage status of these data 150a to 150d is as follows from the secondary storage server 20 to the first area 15a to the fourth area 15d of the file 15 to be downloaded through the threads 14a to 14d as shown in FIG. Each of the included data 150a to 150d is downloaded to the primary storage server 10 in a time-sharing manner in parallel, and accordingly, in the storage file 5, the first storage area corresponding to each thread 14a to 14d The storage processing of the data 150a to 150d in 5a to the fourth storage area 5d is also performed in parallel. Next, the secondary storage server 20 in the download system 1 will be described.

FIG. 6 shows a main internal configuration of the secondary storage server 20 (corresponding to the server device) constituting the download system 1. Similarly to the primary storage server 10, a general server computer is applied to the secondary storage server 20 of the present embodiment, and various devices are connected to the MPU 20a that performs overall control and various processing via the internal connection line 20h. Various devices include a communication module 20b, a RAM 20c, a ROM 20d, an input interface 20e, an output interface 20f, a storage unit 20g, a secondary storage 21, and the like. The secondary storage 21 stores a file 15 to be downloaded in the present invention.

Since the communication module 20b to the output interface 20f are the same as the communication module 10b to the output interface 10f of the primary storage server 10 shown in FIG. 4, description thereof is omitted (the keyboard 20i connected to the input interface 20e and the output). The display 20i connected to the interface 20f is the same as that of the primary storage server 10).

Further, the storage unit 20g of the secondary storage server 20 stores a server program P5, a storage program P6, and the like. The server program P5 defines various processes in accordance with the operating system for the server computer. The server program P5 defines processes that are basically equivalent to the server program P1 of the primary storage server 10 shown in FIG. When the MPU 20a performs the processing based on the secondary storage server 20, the secondary storage server 20 functions as a server computer.

The storage program P6 defines the processing contents performed by the MPU 20a of the secondary storage server 20 in response to the various processes performed by the MPU 10a of the primary storage server 10 as the agent 12. The storage program P6 The standard storage server process is specified.

That is, when the secondary storage server 20 receives confirmation information for inquiring about the capacity of the file 15 through the communication module 20b, the MPU 20a stores the inquiry target file in the secondary storage 21 based on the file name indicated in the confirmation information. The storage program P6 specifies that the file capacity of the specified file (for example, the file 15) is specified as well as specifying from among those specified. The storage program P6 also defines a process in which the MPU 20a generates notification information for notifying the specified file capacity as described above, and transmits the generated notification information to the device that has transmitted the confirmation information. ing.

As described above, the secondary storage server 20 only performs various processes based on the information from the primary storage server 10, and the process for specifying the areas 15a to 15d of the file 15 is also performed as shown in FIG. Since the processing is only performed by the server 10 and the secondary storage server 20 does not perform the process of specifying the area to divide the file, the processing load on the secondary storage server 20 is reduced as compared with the conventional file division download. .

Further, when the storage program P6 receives the request information corresponding to the data request (call) specifying the area in the file, the MPU 20a stores the data included in the file area specified by the request information in the secondary storage. The process of reading out from 21 and transmitting the request information to the transmission source apparatus is defined. In this case, when a plurality of pieces of request information are received simultaneously (in parallel) in a time-sharing process through a plurality of threads, the storage program P2 reads and transmits the data described above based on each thread. It is stipulated that processing at the same time. Therefore, as shown in FIGS. 2A and 2B, when a total of four threads 14a to 14d are used, they are included in the respective areas 15a to 15d included in the file 15 to be downloaded according to the number of threads. The data 150a to 150d to be transmitted to the primary storage server 10 simultaneously.

FIG. 7 is a first flowchart showing a series of processing procedures of the download method by the download system 1 configured by the primary storage server 10 and the secondary storage server 20 that perform the processing as described above (in the first flowchart). Among them, each processing performed on the primary storage server 10 side shows a processing procedure of a download method by the primary storage server 10 (communication device) (the same applies hereinafter). The download method will be described below according to the first flowchart.

First, the primary storage server 10 (the agent 12 by the MPU 10a) sends confirmation information for confirming the file capacity to the secondary storage server 20 storing the file to be downloaded by the above-mentioned “(1) File capacity confirmation function”. Transmit (S1).

The secondary storage server 20 (MPU 20a) is initially in a stage of determining whether or not confirmation information has been received (S11). If it has not been received (S11: NO), the secondary storage server 20 (MPU 20a) is in a reception waiting state. When the information is received (S11: YES), the file to be confirmed is identified, the file capacity of the identified file is detected, and notification information for notifying the detected file capacity is generated to generate the primary storage server 10 (S12).

The primary storage server 10 is in a stage of determining whether or not the notification information from the secondary storage server 20 has been received in response to the transmission of the confirmation information in the stage of S1 (S2). (S2: NO), a state of waiting for reception, on the other hand, when the notification information is received (S2: YES), the file capacity notified by the received notification information by the “(2) file division determination function” described above, The division threshold f1 stored in the storage unit 10g is compared, and it is determined whether or not the file capacity exceeds the division threshold f1 (S3).

When the file capacity does not exceed the division threshold f1 (S3: NO), the primary storage server 10 performs a normal download process without dividing the file (this download process is the same as the conventional one, and will not be described in detail). . Further, when the file capacity exceeds the division threshold f1 (S3: YES), the primary storage server 10 uses the above-mentioned “(3) division area specifying function” to give the areas 15a to 15d (divided areas 15a-15d (divided) to be downloaded). 3) is specified (S4), and the above-described “(4) thread generation function” generates the first thread 14a to the fourth thread 14d (see FIG. 2A, etc.) based on the number of divided areas. (S5).

The primary storage server 10 stores the storage file 5 having the storage areas 5a to 5d corresponding to the areas 15a to 15d of the file 15 to be downloaded (see FIG. 2 (FIG. 2). a)) is generated (S6). It should be noted that the processing order of the process of S6 for generating the storage file 5 and the above-described process of S5 for thread generation can be interchanged.

Then, as shown in FIG. 2A, the primary storage server 10 uses the above-described “(6) data request function” to store a plurality of data 150a to 150a included in each of the plurality of areas 15a to 15d in the file 15 to be downloaded. Request information for requesting data is transmitted to the secondary storage server 20 via the threads 14a to 14d so as to call 150d simultaneously (S7). By the processing in step S7, the request information is transmitted according to the number of threads 14a to 14d (the number that can be processed simultaneously) (the number of request information transmitted simultaneously is the number of threads 14a to 14d). And the number of data called at a time is the same as the number of threads 14a to 14d.

The secondary storage server 20 is in a stage of determining whether or not the request information from the primary storage server 10 has been received in response to the transmission of the notification information in the stage of S12 (S13). S13: NO), a reception waiting state is entered. On the other hand, when the request information is received (S13: YES), the secondary storage server 20 stores the data 150a to 150d included in each of the plurality of areas 15a to 15d in the download target file 15 specified by the received request information. As shown in FIG. 2B, a process of simultaneously transmitting to the primary storage server 10 through the threads 14a to 14d is performed (S14). Note that the number of data 150a to 150d transmitted simultaneously at the same time is the same as the number of threads 14a to 14d (the number depends on the number of threads). Further, when the secondary storage server 20 completes the transmission of the data 150a to 150d, the processing in the download method ends.

The primary storage server 10 receives the data 150a to 150d simultaneously through the threads 14a to 14d in response to the transmission of the request information in the step S7, and receives the received data 150a to 150d. The storage processing is performed in the storage areas 5a to 5d of the storage file 5 corresponding to the areas 15a to 15d of the file 15 in which 150a to 150d were included (S8). By this processing, as shown in FIGS. 2B and 2C, the first data 150a in the first area 15a is stored in the first storage area 5a, and the second data 150b in the second area 15b is stored in the second storage. Stored in the area 5b, the third data 150c in the third area 15c is stored in the third storage area 5c, and the fourth data 150d in the fourth area 15d is stored in the fourth storage area 5d.

Then, the primary storage server 10 determines whether or not the total data capacity of each data 150a to 150d is stored in comparison with the file capacity notified by the notification information (S9), and the total data capacity is not stored. If this is the case (S9: NO), the process returns to the step S8 to continue the data reception and storage process. If the total data capacity of each data 150a to 150d is stored (S9: YES), the process ends. .

The storage file 5 in a state where each data 150a to 150d is stored is configured by the data 150a to 150d. On the other hand, the file 5 to be downloaded also includes the data 150a to 150d. Since the contents of the files are the same, the storage file 5 in which the data 150a to 150d are stored can be used as the download target file 15 (the download target file 15). Will be the same).

In the download according to the present invention described above, the processing via the threads 14a to 14d is started at the same time and most of the download processing is performed at the same time, but each thread 14a to 14d Since the processing is executed independently, even if the download target data capacity is the same, the download completion is not possible due to differences in the actual communication status (congestion level) during the download processing and the processing status related to each thread. The timing may not be the same period and may vary from thread to thread (the download completion time may not be synchronized between threads).

As described above, the secondary storage server 20 (server device) that stores the download target file only performs processing in accordance with the instruction from the primary storage server 10, and the secondary storage server 20 mainly performs the download target. Therefore, there is an advantage that the processing load on the server device side can be reduced as compared with the conventional method of dividing the file to be downloaded. In addition, this invention is not limited to embodiment mentioned above, Various modifications can be assumed.

FIG. 8A shows a menu screen 16 according to a modified example. This menu screen 16 defaults the setting value of the division size f2 stored in the storage unit 10g of the primary storage server 10 shown in FIG. 4 described above. This is for changing the value from one value to another, and is provided as one of the functions of the processing program P2 that makes it possible to accept a numerical value related to the division size to be changed. When the system administrator of the primary storage server 10 performs a predetermined operation using the keyboard 10i or the like, the menu screen 16 is displayed on the display 10j.

The menu screen 16 has a set value input field 16a, a selectable OK button 16b, and a return button 16c. When the system administrator operates the keyboard 10i, etc., and performs the selection operation of the OK button 16b with a mouse or the like in a state where a desired numerical value is input to the set value input field 16a, the primary storage server 10 (MPU) 10a has received the numerical value input in the set value input field 16a, and stores and sets the received numerical value as the division size f2 in the storage unit 10g. In the subsequent processing, as a new setting value, The numerical value of the division size f2 stored in the storage unit 10g is used.

FIGS. 8B and 8C show that the area to be divided and the number of divisions are changed by changing the division size f2 as described above. Similarly to the above-described embodiment, the file 15 to be downloaded is assumed to have a file capacity of 400 MB. When the division size f2 is initially 100 MB as in the above-described embodiment, Although divided into a total of four areas, the first area 15a to the fourth area 15d (see FIG. 3), when the division size f2 is changed to increase to 200 MB through the operation of the menu screen 16 described above, The file 15 is divided into a total of two areas, a first area 15a ′ and a second area 15b ′ (see FIG. 8B). In this case, the start address of the first area 15a ′ is 0 MB and the end address 199 MB, and the start address of the second area 15b ′ is 200 MB and the end address 399 MB.

In addition, when the division size f2 is changed from the default value 100 MB to 50 MB through the operation of the menu screen 16 described above, the file 15 having a file capacity of 400 MB is stored in the first area as shown in FIG. The area is divided into a total of 8 areas, 15a ″ to 8th area 15h ″. In this case, the start address of the first area 15a ″ is 0 MB and the end address is 49 MB. Hereinafter, the start address of the second area 15b ″ is 50 MB, the end address is 99 MB, the start address of the third area 15c ″ is 100 MB, and the end address is 149 MB. The start address of the fourth area 15d "is 150 MB, the end address is 199 MB, the start address of the fifth area 15e" is 200 MB, the end address is 249 MB, the start address of the sixth area 15f "is 250 MB, the end address is 299 MB, and the seventh area 15g The start address of ″ is 300 MB, the end address is 349 MB, the start address of the eighth area 15 h ″ is 350 MB, and the end address is 399 MB.

In this way, by appropriately changing the numerical value of the division size on the menu screen 16, an appropriate division size can be set according to the processing performance of each server 10, 20, communication specifications, changing communication environment, or the like. It can be set as appropriate, and a flexible download environment can be secured. Note that the change of the setting value is not limited to the division size f2, and the numerical value of the division threshold f1 stored in the storage unit 10g of the primary storage server 10 is also determined by a menu screen equivalent to the menu screen 16 described above. It is also possible for the system administrator to make appropriate changes.

Also, if the number of divided areas of a file exceeds the upper limit number of threads (number of simultaneous processes) due to the relationship between the number of divided areas of the file and the maximum number of threads that can be generated, a thread that repeats the download process multiple times may occur. Become.

FIG. 9A shows an outline of the download process when the file 35 to be downloaded is divided into a total of eight first areas 35a to eighth areas 35h, and the total number of threads generated is four. In this case, the storage file 25 generated on the primary storage server 10 side has the same number of first storage areas 25a to 8h as the number of divided areas of the file 35 to be downloaded. In such a case, the download process (download method) is that the number of areas of the file 35 is eight with respect to the number of threads, and therefore, the simultaneous download process is performed twice for each thread. Become.

That is, in the first simultaneous download process in the time chart of FIG. 9B, the data 140a to 140d included in each of the first area 35a to the fourth area 35d of the file 35 is changed to a total of four threads 14a to 14a. 14d is downloaded simultaneously from the secondary storage server 20 to the primary storage server 10 in a time-sharing manner, and the downloaded data 140a to 140d are stored in the first storage area 25a to the fourth storage area 25d of the storage file 25. .

When the first simultaneous download processing is completed, next, the second simultaneous download processing in the time chart of FIG. 9B includes each of the fifth area 35e to the eighth area 35h of the file 35. The data 140e to 140h are downloaded from the secondary storage server 20 to the primary storage server 10 simultaneously in a time division manner according to the total of four threads 14a to 14d, and the downloaded data 140a to 140d are stored in the fifth storage file 25. It is stored in the storage area 25e to the eighth storage area 25h. As a result, all of the data 140a to 140h included in the areas 35a to 35h of the file 35 are downloaded to the primary storage server 10.

The second flowchart of FIG. 10 shows the processing procedure when the number of divisions of the file area to be downloaded exceeds the number of threads to be generated (processing of the download method) as shown in FIGS. 9 (a) and 9 (b). Content). The processes of S21 to S26 of the primary storage server 10 in this second flowchart are basically the same as the processes of S1 to S6 in the first flowchart of FIG. 7, and the secondary storage server 20 in the second flowchart is also the same. The processes of S41 and S42 are basically the same as the processes of S11 and S12 in the first flowchart of FIG. At the stage of S27 in the second flowchart of FIG. 10, in the case shown in FIG. 9A, the primary storage server 10 starts with the first area 35a to the fourth area 35d in the file 35 for each thread 14a to 14d. The request information for requesting the data 140a to 140d included in each is transmitted to the secondary storage server 20.

When the secondary storage server 20 determines whether or not the request information has been received (S43), if the request information has not been received (S43: NO), the secondary storage server 20 is in a reception waiting state, while receiving the request information. If this is the case (S43: YES), the data 140a to 140d included in the first area 35a to the fourth area 35d in the file 35 specified by the received request information are simultaneously transferred to the primary storage server through the threads 14a to 14d. 10 is transmitted (S44).

The primary storage server 10 receives the data 140a to 140d simultaneously through the threads 14a to 14d, and receives the received data 140a to 140d in the first file 35 in which the data 140a to 140d was included. A process of storing in the first storage area 25a to the fourth storage area 25d of the storage file 25 corresponding to the area 35a to the fourth area 35d is performed (S28). Then, the primary storage server 10 determines whether or not all the data capacities of the data 140a to 140d called by the request information transmitted in the step S27 are stored, in the storage status of the first storage area 25a to the fourth storage area 25d. (S29), if the entire data capacity is not stored (S29: NO), the process returns to the step S28, and the data reception and storage processes are continued.

Further, when the total data capacity of each data 140a to 140d is stored (S29: YES), the primary storage server 10 stores the data in the storage file 25 as to whether or not all the data of the file 35 to be downloaded has been received. A determination is made based on the presence or absence of storage areas that have not been made (S30). At this stage, data is stored in the first storage area 25a to the fourth storage area 25d of the storage file 25, but no data is stored in the fifth storage area 25e to the sixth storage area 25h. The storage area in which no data is stored remains, and as a result, the primary storage server 10 determines that all data of the file has not been received (S30: NO), and returns the process to the stage of S27. .

In the returned S27 stage, the primary storage server 10 provides the request information for requesting the data 140e to 140h included in the remaining fifth area 35e to eighth area 35h in the file 35 for each thread 14a to 14d. Transmit to the storage server 20. As in the case described above, when the secondary storage server 20 determines whether or not the request information has been received (S43), if the request information has not been received (S43: NO), the secondary storage server 20 enters a reception waiting state. When the information is received (S43: YES), the data 140e to 140h included in the fifth area 35e to the eighth area 35h in the file 35 specified by the received request information are simultaneously transmitted through the threads 14a to 14d. To the primary storage server 10 is performed (S44).

When the primary storage server 10 receives the data 140e to 140h simultaneously through the threads 14a to 14d, the primary storage server 10 receives the received data 140e to 140h, and the fifth area of the file 35 in which the data 140e to 140h is included. Processing for storing in the fifth storage area 25e to the eighth storage area 25h of the storage file 25 corresponding to 35e to the eighth area 35h is performed (S28). Then, the primary storage server 10 determines whether or not all the data capacities of the data 140e to 140h for the amount called by the request information transmitted in the latest step S27 are stored in the fifth storage area 25e to the eighth storage area 25h. Judging from the storage status (S29), if the entire data capacity is not stored (S29: NO), the process returns to the step S28, and the data reception and storage processes are continued.

Further, when the total data capacity of each data 140e to 140h is stored (S29: YES), the primary storage server 10 determines again whether or not all data of the file 35 has been received (S30). At this stage, since data is stored in all of the first storage area 25a to the eighth storage area 25h of the storage file 25, it is determined that all data of the file 35 has been received (S30: YES). In the description of the second flowchart described above, the process from the first S27 to S43, S44, S28, S29, and S30 corresponds to the first simultaneous download process in the time chart of FIG. The process from the second S27 to S43, S44, S28, S29, and S30 corresponds to the second simultaneous download process in the time chart of FIG. 9B.

Thus, as shown in the second flowchart, if the request information transmission process is performed (repeated) a plurality of times, the present invention can be applied even when the number of divisions of the file area to be downloaded exceeds the number of threads to be generated. The download method concerning can be applied. The example in which the number of divisions of the file area to be downloaded exceeds the number of generated threads is not limited to the case shown in FIG. 9A (the number of divided areas is 8 and the number of threads is 4). In other cases (for example, when the number of divided areas is 10 and the number of threads is 4, when the number of divided areas is 5 and the number of threads is 2, etc.), the processing can be similarly performed based on the second flowchart.

For example, if the number of divided areas to be downloaded is 6 and the number of threads to be generated is 4, two of the four threads send request information twice, and send them to different areas according to each request information. While the two included data are received, the remaining two of the four threads transmit one request information and receive one data according to the request information. Thus, depending on the relationship between the number of divided areas and the number of threads, a thread that transmits a plurality of request information and a thread that transmits a single request information are generated, and the number of transmissions of request information (and the number of data receptions) between threads. ) May make a difference. Depending on the relationship between the number of divided areas and the number of threads, the number of simultaneous download processing repetitions may exceed two (for example, the number of divided areas is 10 and the number of threads is 4). When the number of divided areas to be downloaded is 8 and the number of threads to be generated is 4, each of the four threads transmits request information twice (see FIG. 9A).

Even in the download in the second flowchart shown in FIG. 10 described above, the processing of each of the threads 14a to 14d is executed independently, so the completion time of the first simultaneous download process may not be the same period. For this reason, the second request information is transmitted at the stage of S27 so that the second request information is transmitted at any time as each thread 14a to 14d completes the first download process. Also good. In this case, the contents of all data reception and storage in the determination step (S30) for proceeding to the second request information transmission step (S27) are determined for each thread.

That is, it is determined whether or not a storage area in which no data is stored remains in each storage area corresponding to each of the threads 14a to 14d. When a storage area in which no data is stored remains (S30: NO), go to S27, and if there is no storage area where no data is stored (S30: YES), the download process in that thread is terminated. Specifically, in the first thread 14a, the first thread 14a corresponds to the first storage area 25a and the fifth storage area 25e. Therefore, in the stage of S29, the first thread 14a moves to the first storage area 25a. If the data 140a is stored (S29: YES), it is next determined in S30 whether or not the data 140e is stored in the remaining fifth storage area 25e. If the data 140e is not stored (S30). : NO), the process returns to S27 to transmit the second request information, and when the data 140e is stored (S30: YES), the download process in the first thread 14a is terminated.

The above processing is the same for other threads. In the second thread 14b, when the data 140b is stored in the second storage area 25b (S29: YES), the data is stored in the remaining sixth storage area 25f in S30. It is determined whether 140f is stored. If the data 140f is not stored (S30: NO), the process returns to S27, the second request information is transmitted, and the data 140f is stored (S30: YES). Then, the download process in the second thread 14b ends. Even in the third thread 14c, when the data 140c is stored in the third storage area 25c (S29: YES), it is determined in S30 whether the data 140g is stored in the remaining seventh storage area 25g, and the data 140g is stored in the third thread 14c. If not stored (S30: NO), the process returns to S27, the second request information is transmitted, and when the data 140g is stored (S30: YES), the download process in the third thread 14c is terminated.

In the fourth thread 14d, when the data 140d is stored in the fourth storage area 25d (S29: YES), it is determined in S30 whether the data 140h is stored in the remaining eighth storage area 25h. If 140h is not stored (S30: NO), the process returns to S27 and the second request information is transmitted. If data 140h is stored (S30: YES), the download process in the fourth thread 14c ends. It becomes. In such processing, there may be a difference in the end timing of the download processing in each of the threads 14a to 14d, but it is not necessary to wait for the processing of other threads, so that the processing time for each thread can be shortened. .

In the above description, at step S30 in the second flowchart, it is determined whether or not a storage area in which data is not stored remains, and the request information is transmitted for the second and subsequent times in S27. However, the determination in step S30 may be performed by counting the number of transmissions of request information and determining whether to return to step S27 depending on whether the required number of request information has been transmitted. That is, since the number of file divisions is determined by specifying the file division area in step S24 in FIG. 9, the number of transmissions of request information necessary for each thread is determined. Therefore, when request information is transmitted by each thread in the step S27, the number of transmissions is stored for each thread, and in the step S30, the stored number of transmissions of request information reaches the necessary number of transmissions. If not reached, the process returns to S27, and if reached, the download process in the thread may be terminated.

Further, in the above-described processing, as shown in FIG. 9A, when the number of file area divisions exceeds the number of threads (the number that can be processed simultaneously), the request information is transmitted a plurality of times for each thread. However, if the processing status shown in the time chart of FIG. 9B can be instructed by a single transmission of request information, the first process shown in FIG. In the flow of the flowchart, it becomes possible to cope with the download process when the number of divided areas of the file to be downloaded exceeds the upper limit number of threads that can be generated. In this case, a thread for transmitting request information for requesting data included in a plurality of different areas is generated in the file to be downloaded.

That is, when the number of divided areas of the file 35 is 8 and the number of threads is 4, as shown in FIG. 9A, when the processing procedure of the first flowchart of FIG. Thus, the request information transmitted via the first thread 14a requests the data 140a included in the first area 35a in the first simultaneous download and is included in the fifth area 35e in the second simultaneous download. The request information to be transmitted through the second thread 14b including the instruction to request the data 140e is called the data 140b included in the second area 35b in the first simultaneous download and the second simultaneous download. The request information to be transmitted via the third thread 14c includes an instruction to call the data 140f included in the sixth area 35f. The request information to be transmitted via the fourth thread 14d includes an instruction to call the data 140c included in the third area 35c in the second download and the instruction to call the data 140g included in the seventh area 35g in the second simultaneous download. In addition, the data 140d included in the fourth area 35d is called in the first simultaneous download, and the instruction to call the data 140h included in the eighth area 35h is included in the second simultaneous download.

In step S14, the secondary storage server 20 first performs data transmission by the first simultaneous download. The first thread 14a transmits the data 140a included in the first area 35a, and the second thread. The data 140b included in the second area 35b is transmitted at 14b, the data 140c included in the third area 35c is transmitted at the third thread 14c, and the data 140d included in the fourth area 35d is transmitted at the fourth thread 14d. .

In step S8, the primary storage server 10 stores the data 140a transmitted from the secondary storage server 20 in the first storage area 25a of the storage file 25, and stores the data 140b in the second storage area 25b. 140c is stored in the third storage area 25c, and data 140d is stored in the fourth storage area 25d. Then, at the stage of S9, the primary storage server 10 determines whether or not the entire data capacity of the file 35 to be downloaded has been stored. If all the data has not been stored (S9: NO), the process continues to S8. Data is received and stored in stages.

In the secondary storage server 20, when the first simultaneous download is completed, the first thread 14a performs the second simultaneous download in the step S14 based on the instruction content of the request information sent in the step S7. The data 140e included in the fifth area 35e is transmitted, the data 140f included in the sixth area 35f is transmitted by the second thread 14b, the data 140g included in the seventh area 35g is transmitted by the third thread 14c, and the data The data 140h included in the eighth area 35h is transmitted by the four threads 14d.

The primary storage server 10 stores the transmitted data 140e in the fifth storage area 25e of the storage file 25 and stores the data 140f in the sixth storage area 25f in step S8 in the second simultaneous download. Then, the data 140g is stored in the seventh storage area 25g, the data 140h is stored in the eighth storage area 25h, and then it is determined in step S9 whether or not the entire data capacity of the download target file 35 has been stored. Then, since there is no free storage area of the storage file 25 in the second simultaneous download, it is determined that the entire data capacity has been stored (S9: YES), and the download process ends.

Even when the simultaneous download process is repeated in accordance with the first flowchart of FIG. 7, the data contained in a plurality of different areas may be changed depending on the relationship between the number of file divisions and the number of threads (the number of simultaneous processes). There may be a requesting thread and a thread requesting data contained in a single area. For example, if the number of divided areas to be downloaded is 6 and the number of threads to be generated is 4, two of the four threads transmit request information included in two different areas, while The remaining two only transmit request information contained in a single region. As described above, depending on the relationship between the number of divided areas and the number of threads, a difference may occur between threads in the number of data requested by one piece of request information to be transmitted.

Furthermore, even when the simultaneous download process is repeated according to the first flowchart of FIG. 7, the processes of the respective threads 14a to 14d are executed independently, so that the first simultaneous download process is completed. Since the timing may not be the same period between threads, in such a case, the download process may be executed sequentially in succession with the completion of the simultaneous download process. Is preferred. In this case, the secondary storage server 20 side sequentially transmits the data included in the plurality of areas specified by the received request information to the primary storage server 10, and the data of a certain area specified by the request information When transmission is completed, transmission of data in the next area specified by the request information is started. In this way, the download process is progressed sequentially for each thread, so that the download process may not be completed at the same time between threads, but overall the processing load is reduced and the processing time is shortened. The merit that can be achieved is generated.

In the above description, the file download is performed between the server devices of the primary storage server 10 and the secondary storage server 20 shown in FIG. 1, but the object of the present invention is limited to the download between the server devices. For example, the present invention can be applied to a case where a file stored in the primary storage server 10 in FIG. 1 is downloaded to the user terminal 40. In this case, the download system according to the present invention is configured by the primary storage server 10 (corresponding to the server apparatus) and the user terminal 40 (apparatus in the communication apparatus).

FIG. 11 is a block diagram showing a main configuration of the user terminal 40. As the user terminal 40, a communication terminal device capable of communicating with the primary storage server 10 and processing files can be applied. Specifically, a personal computer, a tablet, a smartphone or the like having a communication function can be used as the user terminal 40. FIG. 11 shows a main configuration when a personal computer is used as the user terminal 40, but the basic configuration is the same as that of FIG. 11 even when a tablet, a smartphone, or the like is used as the user terminal 40.

The user terminal 40 is configured by connecting various devices and the like to the CPU 40a that performs overall control and various processes through an internal connection line 40h. The various devices and the like include a communication module 40b, a RAM 40c, a ROM 40d, and an input interface. 40e, an output interface 40f, and a storage unit 40g.

The communication module 40b is a communication device corresponding to a connection module with a network, and conforms to a required communication standard (for example, a LAN module), and a required communication device (not shown; for example, a router or the like). By connecting to the network via the network, communication with the primary storage server 10 is enabled.

The RAM 40c temporarily stores contents, files, and the like accompanying the processing of the CPU 40a, and the ROM 40d stores programs and the like that define the basic processing contents of the CPU 40a. The input interface 40e is connected to a keyboard 40i, a mouse, and the like for receiving an operation instruction from the user, and transmits the operation instruction received from the user to the CPU 40a. The output interface 40f is connected to the display 40j, and outputs the contents accompanying the processing of the CPU 40a to the display 40j so that the user can visually confirm the operation contents, the processing contents of the user terminal 40, and the like. .

The storage unit 40g is a storage device configured by an HDD (Hard Disk Drive) or SSD (Solid State Drive), and stores programs such as a basic program P20 and a terminal processing program P21, a division threshold f1, a division size f2, and the like. Remember. The basic program P20 defines basic processing performed by the CPU 40a to cause the user terminal 40 to function as a computer. The basic program P20 performs file management (file copy, movement, change, etc.). Functions, browser functions for browsing websites, and the like.

The terminal processing program P21 defines the same content as the content defined by the processing program P2 shown in FIG. This terminal processing program P21 can be installed as an application program on the user terminal 40 via a storage medium (such as an optical disk) in addition to being installed on the user terminal 40 through communication download. The contents are programmed to control processing to function as the agent 12 shown in FIG. Note that the storage file 45 generated by the CPU 40a as the agent storage file generation function is stored in the storage unit 40g according to the provisions of the terminal processing program P21 (see FIG. 11). Further, the division threshold f1 and the division size f2 stored in the storage unit 40g are the same as those stored in the primary storage server 10 illustrated in FIG.

On the other hand, the primary storage server 10 in the case of configuring the user terminal 40 and the download system has the same hardware configuration as that shown in FIG. 4, but the content stored in the storage unit 10g is the secondary storage server in FIG. Similarly to the server 20, the server program P5 and the storage program P6 are stored, and the primary storage 11 stores a file to be downloaded (for example, the file 15).

By configuring the download system with the user terminal 40 and the primary storage server 10 configured as described above, the file (for example, the file 15) stored in the primary storage server 10 is processed by the same processing as that of the download system 1 described above. Can be downloaded to the user terminal 40. Note that the various modifications described above can be applied to the download system including the user terminal 40 and the primary storage server 10 as well.

FIG. 12 shows an overall outline of the download system 50 according to the second embodiment of the present invention. The download system 50 according to the second embodiment is characterized by using a dummy file 55, and the download system according to the first embodiment shown in FIG. In addition to being equivalent to the hardware configuration in FIG. 1, various processes (such as file area division processing and simultaneous download processing of divided data) are also equivalent to those in the first embodiment. Components equivalent to those in the first embodiment will be described using the same reference numerals as those in the first embodiment.

The download system 50 according to the second embodiment is also configured by a primary storage server 10 (corresponding to a communication device) and a secondary storage server 20 (corresponding to a server device). As a feature of the second embodiment, the primary storage server A dummy file 55 is stored in the primary storage 11 of the ten, and a real file 65 corresponding to the dummy file 55 is stored in the secondary storage 21 of the secondary storage server 20, and this real file 65 becomes a file to be downloaded. .

A dummy file is a file also called a stub file, and is presented as an original file to an external client terminal (for example, the user terminal 40 shown in FIG. 1) so as to replace the original file. It includes information that can identify itself as a dummy file, and reference information that is referred to when acquiring (downloading) the original file (corresponding to the real file 65) from the secondary storage 21. . The reference information included in the dummy file includes information indicating the storage destination of the actual file 65 corresponding to the dummy file, information indicating the file capacity of the actual file 65, and the like.

The file capacity of the dummy file is smaller than that of the original file (actual file 65), thereby contributing to securing the free capacity of the primary storage 11. Examples of actual files that can be replaced with dummy files include document data files, spreadsheet data files, and image data files generated by various application software. Image data files such as detailed photographs have a general data amount. Therefore, it is significant to replace the dummy file with a small amount of data by archiving.

As a trigger for the primary storage server 10 to start the process of downloading the actual file 65, it is possible to accept access from the external user terminal 40 to the actual file 65 according to the dummy file 55. . Also in the second embodiment, the MPU 10a functions as an agent according to the specified contents of the processing program P2. In the second embodiment, since the dummy file 55 exists in the primary storage 11, Instead of generating the storage file 5 as described above, a pre-existing dummy file 55 is used as a storage file. Further, since the dummy file 55 includes information indicating the file capacity of the actual file 65 to be downloaded, the “(1) file capacity check function” in the agent 12 of the first embodiment is unnecessary. Hereinafter, the agent function of the CPU 40a of the second embodiment will be described based on the agent 12 (see FIG. 5) of the first embodiment.

Similarly to the “(2) File division determination function” of the first embodiment, the agent of the second embodiment uses the file capacity of the actual file 65 included in the dummy file 55 and the division threshold f1 stored in the storage unit 10g. And a function of determining whether or not the actual file 65 is divided. In addition, the agent of the second embodiment divides the real file 65 based on the file capacity of the real file 65 included in the dummy file 55, as in “(3) Divided area specifying function” of the first embodiment. A processing function for specifying

Further, the agent of the second embodiment, like the “(4) thread generation function” of the first embodiment, time-divides each data included in each area specified for the file to be downloaded (time sharing). In order to be able to download in parallel at the same time, it has a function to generate threads. Furthermore, the agent of the second embodiment expands the dummy file 55 to the same capacity as that of the real file 65 as a characteristic function (dummy file extension function) of the second embodiment, and specifies the divided area. By the function, it has a processing function for forming a plurality of storage areas respectively corresponding to the areas into which the real file 65 is divided.

Then, the agent of the second embodiment, like the “(6) Data request function” of the first embodiment, transmits the data included in each area corresponding to the real file 65 via the generated threads. In order to enable downloading according to the number that can be processed at the same time, it has a function of transmitting request information for requesting data to the secondary storage server 20. Finally, the agent of the second embodiment receives the data when the data of each area is downloaded from the secondary storage server 20 as in “(7) Data storage function” of the first embodiment. Each received data is stored in each storage area of the dummy file 55 corresponding to each area of the actual file 65 in which the data is included.

On the other hand, the processing of the secondary storage server 20 is almost the same as that of the first embodiment except that transmission of notification information is omitted. That is, when the secondary storage server 20 receives the request information corresponding to the data call specifying the area in the real file, the MPU 20a converts the data included in the real file area specified by the request information to the secondary storage. 21 and transmits the request information to the transmission source device. Also at this time, when receiving a plurality of request information simultaneously (in parallel) in a time-sharing process through a plurality of threads, the secondary storage server 20 reads and transmits the data described above in a time-sharing manner according to the threads. It will be processed simultaneously.

FIG. 13 shows a state obtained by each function of the agent of the second embodiment described above, and the real file 65 stored in the secondary storage server 20 is divided into the first area 65a to the fourth area 65d. In addition, in the primary storage server 10, the dummy file 65 is expanded to include the first storage area 55a to the fourth storage area 55d. A total of four first threads 74a to fourth threads 74d are generated (established).

FIG. 14 is a third flowchart showing a series of processing procedures in the download method of the download system 50 according to the second embodiment, which is based on the first flowchart of the first embodiment of FIG. In the flowchart 3, the process starts from the stage when it is determined to download the actual file 65.

First, the primary storage server 10 (agent by the MPU 10a) compares the file capacity of the real file 65 included in the reference information of the dummy file 55 with the division threshold f1 stored in the storage unit 10g, and the file capacity sets the division threshold f1. It is determined whether or not it exceeds (S50). When the file capacity does not exceed the division threshold f1 (S50: NO), the primary storage server 10 performs a normal download process. On the other hand, when the file capacity exceeds the division threshold f1 (S50: YES), the primary storage server 10 Specifies areas 65a to 65d (see FIG. 13) into which the real file 65 is divided (S51), and a total of four first threads according to the number of simultaneously processable processes according to the processing capacity of the CPU 40a and the capacity of the RAM 10c. 74a to fourth thread 74d (see FIG. 13) are generated (S52).

Then, the primary storage server 10 expands the dummy file 55 according to the file size of the real file 65 of the reference information, and generates storage areas 55a to 55d corresponding to the areas 55a to 55d of the real file 55 (S53). Then, the primary storage server 10 transmits request information for requesting a plurality of data included in each of the plurality of areas 55a to 55d in the real file 55 to the secondary storage server 20 for each of the first thread 74a to the fourth thread 74d. (S54).

The secondary storage server 20 is in a stage of determining whether or not the request information from the primary storage server 10 has been received (S60), and if not received (S60: NO), the secondary storage server 20 enters a state of waiting for reception. On the other hand, when the request information is received (S60: YES), the secondary storage server 20 converts each of the data included in each of the plurality of areas 55a to 55d in the real file 55 specified by the received request information. A process of simultaneously transmitting to the primary storage server 10 through the threads 74a to 74d is performed (S61).

When the primary storage server 10 receives the data simultaneously through the threads 74a to 74d in response to the transmission of the request information at the stage of S54, the received data is included in the received data. The storage process is performed in the storage areas 65a to 65d of the dummy file 65 corresponding to the areas 65a to 65d of the real file 65 (S55). Then, the primary storage server 10 determines whether or not the total data capacity of each data is stored in comparison with the file capacity of the actual file 55 included in the reference information (S56), and the total data capacity is not stored. In the case (S56: NO), the process returns to the stage of S55 to continue the data reception and storage processing. When the entire data capacity is stored (S56: YES), the processing is terminated. The second embodiment is the same as the first embodiment except as described above.

As described above, in the download system 50 according to the second embodiment, since the already existing dummy file is used, the primary storage server 10 does not have to create a new storage file as in the first embodiment. There is an advantage that the processing load on the server 10 side can be reduced. Also in the second embodiment, various modifications described in the first embodiment can be applied.

INDUSTRIAL APPLICABILITY The present invention is preferably used for the case where the file to be downloaded is divided and downloaded in parallel processing, so that the processing load on the server device storing the file to be downloaded can be reduced as compared with the conventional system. Is possible.

DESCRIPTION OF SYMBOLS 1,50 Download system 5 Storage file 5a-5d 1st storage area-4th storage area 10 Primary storage server 11 Primary storage 12 Agent 14a-14d Thread 15 (Download object) File 15a-15d 1st area-4th area 20 secondary storage server 21 secondary storage 40 user terminal f1 division threshold f2 division size P1 server program P2 processing program

Claims (13)

In a download system comprising a server device and a communication device for downloading a file stored in the server device,
The communication device
Means for performing a process of transmitting confirmation information for confirming the capacity of a file to be downloaded to the server device;
The server device
When the confirmation information is received, the information processing apparatus includes a unit that performs processing for transmitting notification information to notify the file capacity to the communication device,
The communication device further includes:
When receiving notification information, based on the capacity of the file notified in the notification information, a means for identifying a plurality of areas into which the file to be downloaded is divided,
Means for generating a storage file including a plurality of storage areas corresponding to the plurality of specified areas;
Means for performing a process of transmitting request information for requesting data to the server device so as to simultaneously download the data included in each of the plurality of areas in the file to be downloaded according to the simultaneously processable number,
The server device further includes:
When the request information is received, it comprises means for performing processing for simultaneously transmitting data included in each of the plurality of areas in the file to be downloaded to the communication device according to the simultaneously processable number,
The communication device further includes:
When each data is received, there is provided means for performing a process of storing each received data in each storage area of the storage file corresponding to each area in which each received data was included. Download system. A communication device that stores a dummy file; and a server device that stores a real file corresponding to the dummy file. The dummy file has a smaller file size than the real file and indicates the capacity of the real file. In a download system that includes capacity information and the communication device downloads the actual file from the server device,
The communication device
Means for identifying a plurality of areas into which the actual file is divided based on the capacity of the actual file indicated by the capacity information included in the dummy file;
Means for expanding the capacity of the dummy file so as to include a plurality of storage areas corresponding to the plurality of specified areas;
Means for performing a process of transmitting request information for requesting data to the server device so as to simultaneously download data included in each of the plurality of areas in the real file according to a simultaneously processable number,
The server device
When request information is received, the apparatus includes means for performing processing for simultaneously transmitting data included in each of the plurality of areas in the real file to the communication device according to the simultaneously processable number,
The communication device further includes:
When each data is received, there is provided means for performing a process of storing each received data in each storage area of the dummy file corresponding to each area in which each received data is included. Download system. In a communication device that downloads a file stored in an external server device,
Means for performing processing for transmitting confirmation information for confirming the capacity of a file to be downloaded to an external server device;
In response to the transmission of confirmation information, when notification information notifying the file size is received from an external server device, multiple areas for dividing the file to be downloaded are identified based on the file size notified by the notification information Means to
Means for generating a storage file including a plurality of storage areas corresponding to the plurality of specified areas;
Means for performing a process of transmitting request information for requesting data to an external server device so as to simultaneously download the data included in each of the plurality of areas in the file to be downloaded according to the simultaneously processable number;
In response to transmission of request information, when each data is received from an external server device, each received data is stored in each storage area of the storage file corresponding to each area in which each received data is included. Means for storing each of the communication devices. In a communication device that stores a dummy file and downloads an actual file corresponding to the dummy file from an external server device,
The dummy file has a capacity smaller than that of the actual file and includes capacity information indicating the capacity of the actual file,
Means for identifying a plurality of areas into which the actual file is divided based on the capacity of the actual file indicated by the capacity information included in the dummy file;
Means for expanding the capacity of the dummy file so as to include a plurality of storage areas corresponding to the plurality of specified areas;
Means for performing a process of transmitting request information for requesting data to an external server device so as to simultaneously download the data included in each of the plurality of areas in the real file according to the simultaneously processable number;
When each data is received from an external server device in response to the transmission of the request information, each received data is stored in each storage area of the dummy file corresponding to each area in which each received data is included. Means for storing each of the communication devices. Means for generating the same number of threads that can be processed simultaneously;
5. The communication apparatus according to claim 3, wherein request information is transmitted for each generated thread and data is received for each generated thread. If the number of specified areas exceeds the number that can be processed simultaneously, a thread for transmitting a plurality of request information is generated.
The communication apparatus according to claim 5, wherein each of the plurality of pieces of request information requests data included in a different area. 6. The communication apparatus according to claim 5, wherein when the number of the specified plurality of areas exceeds the simultaneously processable number, a thread for transmitting request information for requesting data included in the plurality of different areas is generated. The means for specifying the plurality of areas is configured to specify a plurality of areas based on a file capacity and a division size.
Means for receiving a numerical value relating to the division size;
The communication apparatus according to any one of claims 3 to 7, further comprising: means for setting an accepted numerical value as the division size. The communication apparatus according to any one of claims 3 to 8, wherein the request information includes information specifying a position range related to the specified area. In a download method in which a communication device downloads a file from an external server device,
A step of performing a process of transmitting confirmation information for confirming the capacity of a file to be downloaded to an external server device;
In response to the transmission of confirmation information, when notification information notifying the file size is received from an external server device, multiple areas for dividing the file to be downloaded are identified based on the file size notified by the notification information And steps to
Generating a storage file including a plurality of storage areas corresponding to the plurality of specified areas;
Performing a process of transmitting request information for requesting data to an external server device so as to simultaneously download the data included in each of the plurality of areas in the file to be downloaded according to the simultaneously processable number;
When each data is received from an external server device in response to the transmission of the request information, each received data is transferred to each storage area of the storage file corresponding to each area in which each data was included. A download method comprising: a step of performing a storing process. In a download method in which a communication device that stores a dummy file downloads an actual file corresponding to the dummy file from an external server device,
The dummy file has a capacity smaller than that of the actual file and includes capacity information indicating the capacity of the actual file,
Identifying a plurality of areas into which the actual file is divided based on the capacity of the actual file indicated by the capacity information included in the dummy file;
Expanding the capacity of the dummy file to include a plurality of storage areas corresponding to the plurality of specified areas;
Performing a process of transmitting request information for requesting data to an external server device so as to simultaneously download data included in each of the plurality of areas in the real file according to a simultaneously processable number;
When each data is received from an external server device in response to the transmission of the request information, each received data is stored in each storage area of the dummy file corresponding to each area in which each received data is included. A download method comprising: performing a process of storing each of them. In a computer program for causing a computer having a communication function to perform processing for downloading a file from an external server device,
In the computer,
A step of performing a process of transmitting confirmation information for confirming the capacity of a file to be downloaded to an external server device;
In response to the transmission of confirmation information, when notification information notifying the file size is received from an external server device, multiple areas for dividing the file to be downloaded are identified based on the file size notified by the notification information And steps to
Generating a storage file including a plurality of storage areas corresponding to the plurality of specified areas;
Performing a process of transmitting request information for requesting data to an external server device so as to simultaneously download the data included in each of the plurality of areas in the file to be downloaded according to the simultaneously processable number;
In response to transmission of request information, when each data is received from an external server device, each received data is stored in each storage area of the storage file corresponding to each area in which each received data is included. And a step of executing a process of storing each of them. In a computer program for causing a computer having a communication function and storing a dummy file to perform processing of downloading an actual file corresponding to the dummy file from an external server device, the dummy file is compared with the actual file. The file size is small and includes capacity information indicating the capacity of the actual file,
In the computer,
Identifying a plurality of areas into which the actual file is divided based on the capacity of the actual file indicated by the capacity information included in the dummy file;
Expanding the capacity of the dummy file to include a plurality of storage areas corresponding to the plurality of specified areas;
Performing a process of transmitting request information for requesting data to an external server device so as to simultaneously download data included in each of the plurality of areas in the real file according to a simultaneously processable number;
When each data is received from an external server device in response to the transmission of the request information, each received data is stored in each storage area of the dummy file corresponding to each area in which each received data is included. And a step of executing a process of storing each of them.

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