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add writer pattern object for later use

pull/2532/head
chrislu 3 years ago
parent
commit
b21a67bbe6
  1. 31
      weed/filesys/page_writer/writer_pattern.go

31
weed/filesys/page_writer/writer_pattern.go

@ -0,0 +1,31 @@
package page_writer
type WriterPattern struct {
isStreaming bool
lastWriteOffset int64
}
// For streaming write: only cache the first chunk
// For random write: fall back to temp file approach
func NewWriterPattern() *WriterPattern {
return &WriterPattern{
isStreaming: true,
lastWriteOffset: 0,
}
}
func (rp *WriterPattern) MonitorWriteAt(offset int64, size int) {
if rp.lastWriteOffset > offset {
rp.isStreaming = false
}
rp.lastWriteOffset = offset
}
func (rp *WriterPattern) IsStreamingMode() bool {
return rp.isStreaming
}
func (rp *WriterPattern) IsRandomMode() bool {
return !rp.isStreaming
}
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