blob: 51c63d47223dc649c6b11e21292fd7652b83d94a (
plain)
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
|
package filesys
type WriterPattern struct {
isStreaming bool
lastWriteOffset int64
chunkSize int64
}
// For streaming write: only cache the first chunk
// For random write: fall back to temp file approach
// writes can only change from streaming mode to non-streaming mode
func NewWriterPattern(chunkSize int64) *WriterPattern {
return &WriterPattern{
isStreaming: true,
lastWriteOffset: -1,
chunkSize: chunkSize,
}
}
func (rp *WriterPattern) MonitorWriteAt(offset int64, size int) {
if rp.lastWriteOffset > offset {
rp.isStreaming = false
}
if rp.lastWriteOffset == -1 {
if offset != 0 {
rp.isStreaming = false
}
}
rp.lastWriteOffset = offset
}
func (rp *WriterPattern) IsStreamingMode() bool {
return rp.isStreaming
}
func (rp *WriterPattern) IsRandomMode() bool {
return !rp.isStreaming
}
func (rp *WriterPattern) Reset() {
rp.isStreaming = true
rp.lastWriteOffset = -1
}
|
