-
Notifications
You must be signed in to change notification settings - Fork 10
Expand file tree
/
Copy pathtime_window_reader.go
More file actions
80 lines (72 loc) · 2.01 KB
/
time_window_reader.go
File metadata and controls
80 lines (72 loc) · 2.01 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
/*
* Copyright 2020 Saffat Technologies, Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package unitdb
import (
"io"
)
type _WindowReader struct {
winBlock _WinBlock
windowIdx int32
fs *_FileSet
winFile *_File
offset int64
}
func newWindowReader(fs *_FileSet) *_WindowReader {
w := &_WindowReader{windowIdx: -1, fs: fs}
winFile, err := fs.getFile(_FileDesc{fileType: typeTimeWindow})
if err != nil {
return w
}
w.winFile = winFile
if winFile.currSize() > 0 {
w.windowIdx = int32(winFile.currSize() / int64(blockSize))
}
return w
}
func (r *_WindowReader) readWindowBlock() (_WinBlock, error) {
buf, err := r.winFile.slice(r.offset, r.offset+int64(blockSize))
if err != nil {
return _WinBlock{}, err
}
if err := r.winBlock.unmarshalBinary(buf); err != nil {
return _WinBlock{}, err
}
return r.winBlock, nil
}
// blockIterator iterates all window blocks from disk.
func (r *_WindowReader) blockIterator(f func(startSeq, topicHash uint64, off int64) (bool, error)) (err error) {
windowIdx := int32(0)
nBlocks := r.windowIdx
for windowIdx <= nBlocks {
r.offset = winBlockOffset(windowIdx)
b, err := r.readWindowBlock()
if err != nil {
if err == io.EOF {
return nil
}
return err
}
windowIdx++
if b.entryIdx == 0 || b.next != 0 {
continue
}
// fmt.Println("timeWindow.blockIterator: topicHash, seq ", b.topicHash, b.entries[0].sequence)
if stop, err := f(b.entries[0].sequence, b.topicHash, r.offset); stop || err != nil {
return err
}
}
return nil
}