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