mirror of
https://github.com/seaweedfs/seaweedfs.git
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113 lines
2.6 KiB
Go
113 lines
2.6 KiB
Go
package filesys
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import (
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"github.com/chrislusf/seaweedfs/weed/filesys/page_writer"
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"github.com/chrislusf/seaweedfs/weed/glog"
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)
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type PageWriter struct {
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fh *FileHandle
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collection string
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replication string
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chunkSize int64
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writerPattern *WriterPattern
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randomWriter page_writer.DirtyPages
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streamWriter page_writer.DirtyPages
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}
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var (
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_ = page_writer.DirtyPages(&PageWriter{})
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)
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func newPageWriter(fh *FileHandle, chunkSize int64) *PageWriter {
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pw := &PageWriter{
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fh: fh,
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chunkSize: chunkSize,
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writerPattern: NewWriterPattern(chunkSize),
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randomWriter: newMemoryChunkPages(fh, chunkSize),
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}
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return pw
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}
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func (pw *PageWriter) AddPage(offset int64, data []byte) {
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glog.V(4).Infof("%v AddPage [%d, %d) streaming:%v", pw.fh.f.fullpath(), offset, offset+int64(len(data)), pw.writerPattern.IsStreamingMode())
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chunkIndex := offset / pw.chunkSize
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for i := chunkIndex; len(data) > 0; i++ {
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writeSize := min(int64(len(data)), (i+1)*pw.chunkSize-offset)
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pw.addToOneChunk(i, offset, data[:writeSize])
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offset += writeSize
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data = data[writeSize:]
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}
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}
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func (pw *PageWriter) addToOneChunk(chunkIndex, offset int64, data []byte) {
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if chunkIndex > 0 {
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if pw.writerPattern.IsStreamingMode() && pw.streamWriter != nil {
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pw.streamWriter.AddPage(offset, data)
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return
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}
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}
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pw.randomWriter.AddPage(offset, data)
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}
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func (pw *PageWriter) FlushData() error {
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pw.writerPattern.Reset()
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if pw.streamWriter != nil {
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if err := pw.streamWriter.FlushData(); err != nil {
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return err
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}
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}
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return pw.randomWriter.FlushData()
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}
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func (pw *PageWriter) ReadDirtyDataAt(data []byte, offset int64) (maxStop int64) {
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glog.V(4).Infof("ReadDirtyDataAt %v [%d, %d)", pw.fh.f.fullpath(), offset, offset+int64(len(data)))
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chunkIndex := offset / pw.chunkSize
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for i := chunkIndex; len(data) > 0; i++ {
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readSize := min(int64(len(data)), (i+1)*pw.chunkSize-offset)
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if pw.streamWriter != nil {
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m1 := pw.streamWriter.ReadDirtyDataAt(data[:readSize], offset)
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maxStop = max(maxStop, m1)
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}
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m2 := pw.randomWriter.ReadDirtyDataAt(data[:readSize], offset)
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maxStop = max(maxStop, m2)
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offset += readSize
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data = data[readSize:]
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}
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return
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}
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func (pw *PageWriter) GetStorageOptions() (collection, replication string) {
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if pw.writerPattern.IsStreamingMode() && pw.streamWriter != nil {
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return pw.streamWriter.GetStorageOptions()
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}
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return pw.randomWriter.GetStorageOptions()
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}
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func (pw *PageWriter) Destroy() {
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if pw.streamWriter != nil {
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pw.streamWriter.Destroy()
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}
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pw.randomWriter.Destroy()
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}
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func max(x, y int64) int64 {
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if x > y {
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return x
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}
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return y
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}
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func min(x, y int64) int64 {
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if x < y {
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return x
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}
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return y
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}
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