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detect sequential mode with a counter

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This commit is contained in:
chrislu 2022-07-13 02:20:03 -07:00
parent 578c8aea0e
commit 6e90f7bdd0
1 changed files with 10 additions and 19 deletions
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29
weed/filer/reader_pattern.go
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@ -1,8 +1,8 @@
package filer
type ReaderPattern struct {
isStreaming bool
lastReadOffset int64
isSequentialCounter int64
lastReadStopOffset int64
}
// For streaming read: only cache the first chunk
@ -10,29 +10,20 @@ type ReaderPattern struct {
func NewReaderPattern() *ReaderPattern {
return &ReaderPattern{
isStreaming: true,
lastReadOffset: -1,
isSequentialCounter: 0,
lastReadStopOffset: 0,
}
}
func (rp *ReaderPattern) MonitorReadAt(offset int64, size int) {
isStreaming := true
if rp.lastReadOffset > offset {
isStreaming = false
if rp.lastReadStopOffset == offset {
rp.isSequentialCounter++
} else {
rp.isSequentialCounter--
}
if rp.lastReadOffset == -1 {
if offset != 0 {
isStreaming = false
}
}
rp.lastReadOffset = offset
rp.isStreaming = isStreaming
}
func (rp *ReaderPattern) IsStreamingMode() bool {
return rp.isStreaming
rp.lastReadStopOffset = offset + int64(size)
}
func (rp *ReaderPattern) IsRandomMode() bool {
return !rp.isStreaming
return rp.isSequentialCounter >= 0
}