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37 lines
849 B
37 lines
849 B
package mount
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type WriterPattern struct {
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isSequentialCounter int64
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lastWriteStopOffset int64
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chunkSize int64
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}
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const ModeChangeLimit = 3
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// For streaming write: only cache the first chunk
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// For random write: fall back to temp file approach
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func NewWriterPattern(chunkSize int64) *WriterPattern {
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return &WriterPattern{
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isSequentialCounter: 0,
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lastWriteStopOffset: 0,
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chunkSize: chunkSize,
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}
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}
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func (rp *WriterPattern) MonitorWriteAt(offset int64, size int) {
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if rp.lastWriteStopOffset == offset {
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if rp.isSequentialCounter < ModeChangeLimit {
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rp.isSequentialCounter++
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}
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} else {
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if rp.isSequentialCounter > -ModeChangeLimit {
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rp.isSequentialCounter--
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}
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}
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rp.lastWriteStopOffset = offset + int64(size)
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}
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func (rp *WriterPattern) IsSequentialMode() bool {
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return rp.isSequentialCounter >= 0
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}
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