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44 lines
929 B
44 lines
929 B
package mount
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type WriterPattern struct {
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isStreaming bool
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lastWriteOffset int64
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chunkSize int64
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}
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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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// writes can only change from streaming mode to non-streaming mode
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func NewWriterPattern(chunkSize int64) *WriterPattern {
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return &WriterPattern{
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isStreaming: true,
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lastWriteOffset: -1,
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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.lastWriteOffset > offset {
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rp.isStreaming = false
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}
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if rp.lastWriteOffset == -1 {
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if offset != 0 {
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rp.isStreaming = false
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}
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}
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rp.lastWriteOffset = offset
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}
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func (rp *WriterPattern) IsStreamingMode() bool {
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return rp.isStreaming
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}
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func (rp *WriterPattern) IsRandomMode() bool {
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return !rp.isStreaming
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}
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func (rp *WriterPattern) Reset() {
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rp.isStreaming = true
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rp.lastWriteOffset = -1
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}
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