CN102571427B - The name of CIM resource and analytic method in a kind of distributed system - Google Patents

Abstract

The invention discloses a CIM resource naming and analysis method in a distributed system. The CIM resource reference name includes a resource name identifier describing an entity resource and a resource naming expression describing a virtual resource; the naming analysis service in the system is distributed in each distribution In the server, according to the resource name identifier in the resource reference name, the deployment object to which the resource belongs is determined, and the local naming resolution server is located, and the local naming resolution server resolves the resource reference name. In this way, it is ensured that the resource reference name can cover all CIM entity resources and virtual resources in the system, and in a distributed environment, the resource name can be quickly resolved to the entity pointed to by the name, and the resource entity in the distributed environment can be efficiently searched.

Description

A method for naming and analyzing CIM resources in a distributed system

technical field

The invention relates to a public information model resource naming analysis technology

Background technique

Names play an important role in all computer systems, especially in distributed systems. They are used to share resources, uniquely identify entities, point to locations, etc. To resolve names, a naming system needs to be implemented.

Naming systems generally focus on two types of issues: namely 1) the organization and implementation of user-friendly names, typical examples such as URI names for the World Wide Web and the file system; 2) how names can be implemented to locate entities in a manner independent of their current location.

Common resource naming methods mainly include random identifier method and hierarchical method.

The random identifier method is as follows:

In many cases, identifiers are just random strings. An important property of this naming style is that it does not contain any information about how to locate the access point of its related entities. In some cases, this name works well, and it is often used because of its convenient naming method. A typical example of this naming method is the access of various machines in a local area network. Locating an entity in this environment is a very simple matter: a message containing the identifier used by the entity is broadcast to each machine, and each A machine checks to see if it owns the entity, and only the machine that provides the entity with an access point will send a reply message containing the address of the access point. As the network swells, broadcasting becomes inefficient. One possible solution is to switch to multicast, by using multicast, only a group of hosts that meet the criteria will receive the request.

The layering method is as follows:

In a hierarchical scheme, a network of named entities is partitioned into a set of domains. There is a top-level domain that covers the entire web. Each domain can be further divided into multiple smaller sub-domains. Each domain has an associated directory node. Nodes keep track of entities in the domain, thus forming a tree of directory nodes. The directory node of the top-level domain becomes the root (directory) node, which includes all entities.

To track the location of entities, each entity within the current domain is represented by a location record in the corresponding directory node. The directory node of the parent domain has a pointer to the directory node of the underlying subdomain.

In this hierarchical naming scheme, name lookup and location operations are carried out locally, that is, the search for entities is carried out in a gradually increasing ring centered on the user who issued the lookup request. Whenever a lookup request is forwarded to a higher-level directory node, the search area is enlarged. In the worst case, the search continues until the request reaches the root node. Since the superior node has the location records of all entities below it, the request can simply be forwarded along a downward pointer route to the initial leaf node.

The existing Common Information Model (Common Information Model, referred to as "CIM") resources include the following characteristics:

1. CIM modeling objects include entities in the real world (such as substations, transformers, air conditioners, RTUs, etc.), software entities in the information world (such as various systems, services, etc.), and virtual information points (such as data acquisition point, control point, etc.), these CIM entities have certain business meanings;

2. The CIM model is a "tree" with a hierarchical structure. If the security control strategy factors of the application system are considered, the CIM model can be expressed as a directed acyclic graph.

Therefore, the CIM resource naming service is faced with the problem of how to efficiently search for CIM resources in addition to solving the two types of problems common to the above-mentioned general naming systems. This is because the data accessed by the application system is not only the CIM entity object, but also virtual objects such as the reference object's attributes, measurements, auxiliary object resources and related attributes related to the object. This requires resolving these attached resource descriptions into references related to the object. At the same time, the schema replaceability of the CIM database (a characteristic of the schema-driven architecture) makes it very difficult to achieve such a relatively common name naming and resolution.

Contents of the invention

The technical problem mainly solved by the present invention is to provide a method for naming and resolving CIM resources in a distributed system, so that all CIM entity resources and virtual resources in the system can be covered, and resource names can be quickly resolved into the name of the name in a distributed environment. The entity pointed to can efficiently search for resource entities in a distributed environment.

In order to solve the above technical problems, the present invention provides a method for naming and analyzing CIM resources in a distributed system. The CIM resources in the system are stored in each distributed server. The CIM resources in the system include physical resources and virtual resources, and the virtual resources belong to Entity resources: Entity resources are divided into deployment objects and ordinary resource objects. The ordinary resource objects in the system are subordinate to the deployment objects. There are affiliation relationships between each ordinary resource object and each ordinary resource object, and between each deployment object. Common resource objects and/or deployment objects are stored in the same server as their superior deployment objects, and the method includes the following steps:

Assign a resource reference name to each CIM resource. The resource reference name includes a resource name identifier and a default resource naming expression. The resource name identifier is used to describe a physical resource, and the resource naming expression is used to describe a virtual resource. ;The resource name identifier of the deployment object at least includes the name of the deployment object, and the resource name identifier of the common resource object at least includes the name of the common resource object and the name of at least one superior deployment object to which it belongs; the resource reference name of the virtual resource is determined by its The resource name identifier of the entity resource to which it belongs and the resource naming expression of the virtual resource;

The naming resolution service in the system is distributed in each distributed server. When receiving a resource access request from a client, according to the resource name identifier in the resource reference name in the request, determine the deployment object to which the resource belongs, and locate the deployment object The corresponding local naming resolution server resolves the resource reference name and returns the resolution result to the client.

As a further improvement, the resource naming expression includes at least one of the following:

An expression of a static property of an entity resource; and/or

An expression of a dynamic property of an entity resource; and/or

A resource or resource property lookup expression; and/or

Directory service query expression.

As a further improvement, after receiving a resource access request from the client, according to the resource name identifier in the resource reference name in the request, determine the deployment object to which the resource belongs, and locate the local name resolution server corresponding to the deployment object. Root name resolution executed by the server; this step contains the following substeps:

Pre-save the deployment object structure tree in the root naming resolution server;

When the root naming resolution server receives a resource access request, it extracts the resource reference name in the request, decomposes the resource reference name to obtain the resource name identifier, and searches the deployment object structure tree according to the deployment object name in the resource name identifier, Determine the local naming resolution server corresponding to the deployment object.

As a further improvement, the deployment object structure tree includes the subordinate hierarchy of each deployment object in the system, and the local naming resolution server information corresponding to each deployment object.

As a further improvement, the deployment object structure tree includes the subordinate hierarchy of each deployment object in the system, and the resource ID corresponding to each deployment object;

In the step of searching the deployment object structure tree according to the deployment object name in the resource name identifier, and determining the local naming resolution server corresponding to the deployment object, the resource location server locates the local naming resolution server corresponding to the resource ID.

As a further improvement, if the root naming resolution server decomposes the resource reference name, only the resource name identifier is obtained without the resource naming expression; and the resource name identifier only contains the name of the deployment object, then the root naming resolution server will After the object name searches the deployment object structure tree, the resource ID corresponding to the deployment object is directly returned to the client.

As a further improvement, the local naming resolution server resolves the resource reference name, and the step of returning the resolution result to the client includes the following substeps:

The local naming resolution server resolves the resource reference name. If the resource reference name only contains the resource name identifier, the local naming resolution server obtains the corresponding resource according to the deployment object name and/or common resource object name in the resource name identifier ID, return the resource ID to the client, and the client accesses the entity resource according to the resource ID.

As a further improvement, the local naming resolution server resolves the resource reference name, and the step of returning the resolution result to the client includes the following substeps:

The local naming resolution server analyzes the resource reference name. If the resource reference name contains the resource name identifier and resource naming expression, it searches for the resource naming expression according to preset rules, obtains the corresponding virtual resource content, and feeds back to the client.

As a further improvement, after the root naming resolution server locates the local naming resolution server corresponding to the resource ID through the resource location server, the following steps are further included:

The corresponding relationship between the resource ID and the local naming resolution server is saved, and when the local naming resolution server corresponding to the deployment object needs to be determined, the corresponding relationship stored locally is preferentially searched.

As a further improvement, when the resource access request contains at least two resource reference names, merge the resource name identifiers in each resource reference name, and perform a step of locating the local naming resolution server once for the same resource name identifier, by The local naming resolution server respectively resolves resource reference names with the same resource name identifier.

Compared with the prior art, the embodiment of the present invention has the main difference and its effect in that: a resource reference name is assigned to each CIM resource, and the resource reference name includes a resource name identifier and a default resource naming expression. The name identifier is used to describe the entity resource, and the resource naming expression is used to describe the virtual resource; the resource name identifier of the deployment object at least includes the name of the deployment object, and the resource name identifier of the common resource object includes at least the name of the common resource object and other The name of at least one superior deployment object to which it belongs; the resource reference name of a virtual resource is composed of the resource name identifier of the entity resource to which it belongs and the resource naming expression of the virtual resource; the naming resolution service in the system is distributed in each distributed server , when receiving a resource access request from the client, determine the deployment object to which the resource belongs according to the resource name identifier in the resource reference name in the request, locate the local naming resolution server corresponding to the deployment object, and the local naming resolution server Parse the resource reference name, and return the parsing result to the client. In this way, it is ensured that the resource reference name can cover all CIM entity resources and virtual resources in the system, and the resource name can be quickly resolved into the entity pointed to by the name in a distributed environment, so as to efficiently search for resource entities in a distributed environment.

Description of drawings

Fig. 1 is a schematic diagram of the CIM resource structure of XXXX power supply bureau in the first embodiment of the present invention;

FIG. 2 is a flow chart of the CIM resource name resolution method according to the first embodiment of the present invention.

detailed description

In order to make the purpose, technical solution and advantages of the present invention clearer, the following will further describe the implementation of the present invention in detail in conjunction with the accompanying drawings.

The first embodiment of the present invention relates to a method for naming and analyzing CIM resources in a distributed system. The "resources" described in this embodiment include physical resources in the real world (such as substations, transformers, air conditioners, RTUs, etc.), software physical resources in the information world (such as various systems, services, etc.), and virtual resources. (such as object attributes, measurements, auxiliary object resources and attributes, and search for associated resources, etc.), these resources and their interrelationships are formed based on CIM modeling, and are information models necessary for the operation of information systems.

Specifically, CIM resources in the system include physical resources and virtual resources, and virtual resources are subordinate to physical resources, including object attributes, measurements, auxiliary object resources and attributes, and search for associated resources of physical resource objects.

The distribution of CIM entity resources is a "tree" with a hierarchical structure. There is a subordinate relationship between each object resource. The main object resource contains multiple subordinate object resources, and the subordinate object resources can further contain the next level subordinate object resources. . For example, for a power system, the power supply bureau itself is an object resource, and it can also include object resources such as substations, monitoring centers, power bureau substation network structure diagrams, and system login diagrams. Substations can also include main wiring diagrams and network structures. Object resources such as graphs. In this embodiment, these object resources are divided into deployment objects and ordinary resource objects, where the deployment objects are generally the main object resources or the relatively main subordinate object resources, such as substations, monitoring centers, etc.; others are ordinary resource objects, such as power bureaus Substation network structure diagram, main wiring diagram, etc., as shown in Figure 1. In practical applications, it can be divided according to needs. Ordinary resource objects in the system are subordinate to deployment objects. There can be affiliation between each ordinary resource object and between each deployment object and deployment object. Ordinary resource objects, lower-level deployment objects and their upper-level deployment objects are stored in In the same server; resources belonging to different deployment objects can be stored in different distributed servers.

Considering the characteristics of CIM resources and the distributed requirements based on CIM applications, in this embodiment, the CIM resource naming (resource reference name) mainly includes two parts: the resource name identifier Resource-Identifier, and the resource naming expression Naming-Expression, using The following syntax forms:

<Resource-Identifier>[.Naming-Expression]

Among them, the resource naming expression represented by "[]" can be omitted according to the specific application environment; the resource name identifier in "<...>" is the actual naming part and cannot be omitted.

The resource name identifier is used to describe the entity resource, and the resource naming expression is used to describe the virtual resource; thus, the resource reference name of the entity resource only needs to include the resource name identifier part, and the resource reference name of the virtual resource must include the resource name identifier and the resource naming expression two parts.

Among them, the resource name identifier of the deployment object includes at least the name of the deployment object, and the name of its superior deployment object can be omitted, and the following syntax is used:

[.Superior Deployment Object[...]].This Deployment Object

The resource name identifier of an ordinary resource object includes at least the name of the ordinary resource object and the name of at least one upper-level deployment object to which it belongs, and the name of the upper-level ordinary resource object to which the ordinary resource object belongs and the upper/lower level of the deployment object to which it belongs can be omitted Deployment object name, in the following syntax form:

Deployment object[.lower-level deployment object[…]].[.superior entity resource object[…]].This entity resource object

This naming method uses the deployment object as a structural level to organize the naming of entities, and "flatten" the other entity resources below the deployment object, which simplifies the reference of CIM entities and is more convenient and user-friendly to use.

In the CIM resource schematic diagram shown in Figure 1, "XXXX Power Supply Bureau", "Substation 1", and "Substation 2" are system deployment objects. Examples of resource reference names that conform to the above naming rules are as follows:

"Substation 2" > "110kV Section 1" > "Unit 504" > "Protection Device 504":

Substation 2.504 protection device

The introduction of "resource naming expression (Naming Expression)" in this embodiment is to solve many complex resource naming issues such as object attributes, measurements, auxiliary object resources and attributes, and search for associated resources of entity resource objects.

The syntax for a resource naming expression is as follows: function-name(parameter-list).[attribute]

The following types of named expressions are currently supported:

1) For the static attribute of the entity resource object, its expression is: A (attribute name), such as "XXXX power supply bureau.Substation 2.504 protection device.A(name)" means referencing "name attribute of 504 protection device";

2) For the dynamic attribute of the entity resource object (i.e. measurement), since in the CIM model, the measurement itself is an object resource, but it is also a subsidiary attribute of the superior entity resource, so its naming expression is: M(measurement name).[value|quality|property], such as "substation 2.workstation 1.M(CPU usage).value", means ".the simulated measurement value of the CPU usage of workstation 1".

3) Support named resource lookup expressions, these resources include:

——The expression of the object resource is: search template function name (object), where object is a fixed parameter name, such as "substation 2.MEAS(object)", that is, to search for all measurement objects under substation 2; "substation 2. IED(object)" means to find all IED objects under substation 2.

——The expression of object resource attribute is: search template function name (object). attribute, such as "substation 2.MEAS(object).value", which refers to the value attribute of all measurement objects under substation 2.

4) Support directory service query expressions

Directory service query expressions include queries for a class of resources in the directory, and queries for resources that meet the same conditions. Its expression is: DIR (subject, assertion, object), wherein "DIR" is the keyword of the function name of the directory service, and the resource queried by the directory service is described by the triplet of "subject, assertion, object". Such triples include "class, attribute, value", "attribute URI, relational expression, value", etc., such as "substation 2.DIR(AnalogLimitSet, type, ROC)", which means to find all the alarms set as the rate of change The measurement object for the event.

The application of the "resource naming expression" basically realizes the universality goal of the CIM resource naming service in the face of diverse resource name resolution. Therefore, it is ensured that the resource reference name in this embodiment can cover all CIM entity resources and virtual resources in the system.

The specific naming resolution process is shown in Figure 2. In a distributed deployment environment, there may be multiple naming resolution services distributed in different naming resolution servers. The system includes a public root naming resolution server. Save the address of the root naming resolution server.

In step 201, the root naming resolution server pre-stores the deployment object structure tree. The deployment object structure tree includes the subordinate hierarchy structure of each deployment object in the system, and the local naming resolution server information corresponding to each deployment object.

In step 202, the client sends a resource access request to the root naming resolution server, and the resource reference name is included in the request.

In step 203, when the root naming resolution server receives the resource access request, it extracts the resource reference name in the request, decomposes the resource reference name to obtain the resource name identifier, and searches for the deployment object according to the deployment object name in the resource name identifier structure tree to determine the local naming resolution server corresponding to the deployment object.

In step 204, the resource reference name is resolved by the local naming resolution server.

If the resource reference name only contains the resource name identifier, the local naming resolution server obtains the corresponding resource ID according to the deployment object name and/or common resource object name in the resource name identifier, and returns the obtained resource ID to the client, The client accesses the entity resource according to the resource ID. (The resource IDs of the deployment objects and common resource objects under the server are pre-stored in the local naming resolution server).

If the resource reference name includes a resource name identifier and a resource naming expression, the resource naming expression is searched according to preset rules, corresponding virtual resource content is acquired, and fed back to the client.

In this way, it is ensured that the resource name can be quickly resolved into the entity pointed to by the name in the distributed environment, and the resource entity in the distributed environment can be efficiently searched.

For the manner in which the above-mentioned client accesses the entity resource according to the resource ID, reference may be made to patent 201010295955.6 "A Resource Locating Method in a Distributed Environment".

It should be noted that, in this embodiment, when the resource access request of the client includes multiple resource reference names, the root naming resolution server merges the resource name identifiers in each resource reference name, and executes A step of locating a local naming resolution server, which respectively resolves resource reference names with the same resource name identifier. This simplifies the process and improves the overall resolution speed.

The second embodiment of the present invention also relates to a method for naming and parsing CIM resources in a distributed system, which is roughly the same as the first embodiment, the difference being that in the first embodiment, the deployment object structure tree includes each deployment object in the system The subordinate hierarchical structure of the deployment object and the local naming resolution server information corresponding to each deployment object can directly locate the local naming resolution server corresponding to the deployment object according to the deployment object structure number; in this embodiment, the deployment object structure tree includes the The subordinate hierarchical structure of the object, and the resource ID corresponding to each deployment object, the root naming resolution server locates the local naming resolution server corresponding to the resource ID through the resource location server. Moreover, the root naming resolution server saves the correspondence between the resource ID and the local naming resolution server, and when it is necessary to determine the local naming resolution server corresponding to the deployment object next time, it will preferentially search from the locally saved correspondence.

In this embodiment, if the resource reference name requested by the client to be resolved is the name of the deployment object, that is, the root naming resolution server decomposes the resource reference name, and only obtains the resource name identifier without the resource naming expression; and the resource If the name identifier only contains the name of the deployment object, the root naming resolution server searches the deployment object structure tree according to the name of the deployment object, and directly returns the resource ID corresponding to the deployment object to the client.

Although the present invention has been illustrated and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the present invention. The spirit and scope of the invention.

Claims (10)

1. the name of common information model resource and an analytic method in distributed system, in system CIM resource is stored in each distributed server, it is characterised in that in described system, CIM resource comprises Actual resource and virtual resource, virtual resource is subordinated to actual resource；Actual resource is divided into deployment object With common resources object, the common resources object in described system is subordinated to dispose object, each common resources Between object and common resources object, between each deployment object and deployment object, comprise membership relation respectively, Common resources object and/or dispose the object higher level affiliated with it and dispose object and be stored in same server, The method includes the steps of:

Distributing a quoting resource title for each CIM resource, this quoting resource title includes resource name mark The resource designational expression known and can be default, this resource name mark is used for describing actual resource, this money Source designational expression is used for describing virtual resource；Dispose the resource name mark of object including at least this deployment The title of object, the resource name mark of common resources object is including at least the title of this common resources object At least one higher level affiliated with it disposes the title of object；The quoting resource title of described virtual resource by The resource name mark of actual resource belonging to it and the resource designational expression of this virtual resource are constituted；

Naming resolution service in described system is distributed in each distributed server, is receiving from client During the resource access request held, extract the quoting resource title in this request, this quoting resource title is entered Row decomposition obtains resource name mark, and the deployment object oriented in identifying according to this resource name is searched and disposed Object structure tree, determines the deployment object belonging to this resource, positions the local name that this deployment object is corresponding Resolution server, is resolved this quoting resource title by this this locality Naming resolution server, will resolve Result returns to described client.

The name of CIM resource and analytic method in distributed system the most according to claim 1, its Being characterised by, described resource designational expression is including at least one below:

The expression formula of the static attribute of actual resource；And/or

The expression formula of the dynamic attribute of actual resource；And/or

Resource or Resource Properties search expression formula；And/or

Directory services query expression formula.

The name of CIM resource and analytic method in distributed system the most according to claim 1, its It is characterised by, described is receiving from the resource access request of client, according to quoting resource in this request Resource name mark in title, determines the deployment object belonging to this resource, positions this deployment object corresponding Local Naming resolution server step by root Naming resolution server perform；This step comprises following son Step:

Described Naming resolution server pre-saves deployment object structure tree；

Described Naming resolution server is when receiving resource access request, and the resource extracted in this request is drawn By title, this quoting resource title is carried out decomposition and obtains resource name mark, according to this resource name mark Deployment object oriented in knowledge searches described deployment object structure tree, determines this locality that this deployment object is corresponding Naming resolution server.

The name of CIM resource and analytic method in distributed system the most according to claim 3, its Be characterised by, described deployment object structure tree comprises in system each dispose object subordinate layer aggregated(particle) structure, The local Naming resolution server info corresponding with each deployment object.

The name of CIM resource and analytic method in distributed system the most according to claim 3, its Be characterised by, described deployment object structure tree comprises in system each dispose object subordinate layer aggregated(particle) structure, The resource ID corresponding with each deployment object；

It is described according to the deployment object oriented described deployment object structure tree of lookup in this resource name mark, Determine in the step of the local Naming resolution server that this deployment object is corresponding, pass through resource locator server Local Naming resolution server corresponding to this resource ID is positioned.

The name of CIM resource and analytic method in distributed system the most according to claim 5, its It is characterised by, if this quoting resource title is decomposed by described Naming resolution server, has to Resource name identifies, and does not comprises resource designational expression；And it is right only to comprise deployment in this resource name mark The title of elephant, the most described Naming resolution server searches described deployment object knot according to disposing object oriented After Broussonetia papyrifera, directly resource ID corresponding for this deployment object is returned to described client.

The name of CIM resource and analytic method in distributed system the most according to claim 1, its Being characterised by, this quoting resource title is resolved by described local Naming resolution server, parsing is tied Fruit returns in the step of described client, comprises following sub-step:

This quoting resource title is resolved by described local Naming resolution server, if this quoting resource Title only comprises resource name mark, then during this this locality Naming resolution server identifies according to resource name Dispose object oriented and/or common resources object oriented obtain the resource ID of correspondence, by described resource ID Returning to described client, described client accesses this actual resource according to described resource ID.

The name of CIM resource and analytic method in distributed system the most according to claim 1, its Being characterised by, this quoting resource title is resolved by described local Naming resolution server, parsing is tied Fruit returns in the step of described client, comprises following sub-step:

This quoting resource title is resolved by described local Naming resolution server, if this quoting resource Title comprises resource name mark and resource designational expression, then according to this resource of rule searching preset Designational expression, obtains corresponding virtual resource content, feeds back to described client.

The name of CIM resource and analytic method in distributed system the most according to claim 5, its Being characterised by, described Naming resolution server passes through resource locator server to corresponding to this resource ID After local Naming resolution server carries out the step positioned, also comprise the steps of

Preserve the corresponding relation of this resource ID and local Naming resolution server, it needs to be determined that dispose object During corresponding local Naming resolution server, preferentially make a look up from the corresponding relation that this locality preserves.

CIM resource name in distributed system the most as claimed in any of claims 1 to 9 And analytic method, it is characterised in that in described resource access request, comprise at least two quoting resource name During title, the resource name in described each quoting resource title is identified and carries out merger, to identical resource name Claim mark, perform the step of one-time positioning this locality Naming resolution server, by this this locality Naming resolution service Device identifies identical quoting resource title to described each resource name respectively and resolves.