just refactoring

weed/filesys/page_writer/page_chunk.go

@@ -1,12 +1,64 @@
 package page_writer
 
 import (
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"github.com/chrislusf/seaweedfs/weed/util/mem"
 	"io"
 )
 
 type SaveToStorageFunc func(reader io.Reader, offset int64, size int64, cleanupFn func())
 
+type PageChunk interface {
+	FreeResource()
+	WriteDataAt(src []byte, offset int64) (n int)
+	ReadDataAt(p []byte, off int64, logicChunkIndex LogicChunkIndex, chunkSize int64) (maxStop int64)
+	IsComplete(chunkSize int64) bool
+	SaveContent(saveFn SaveToStorageFunc, logicChunkIndex LogicChunkIndex, chunkSize int64)
+}
+
+var (
+	_ = PageChunk(&MemChunk{})
+)
+
 type MemChunk struct {
 	buf   []byte
 	usage *ChunkWrittenIntervalList
 }
+
+func (mc *MemChunk) FreeResource() {
+	mem.Free(mc.buf)
+}
+
+func (mc *MemChunk) WriteDataAt(src []byte, offset int64) (n int) {
+	n = copy(mc.buf[offset:], src)
+	mc.usage.MarkWritten(offset, offset+int64(n))
+	return
+}
+
+func (mc *MemChunk) ReadDataAt(p []byte, off int64, logicChunkIndex LogicChunkIndex, chunkSize int64) (maxStop int64) {
+	memChunkBaseOffset := int64(logicChunkIndex) * chunkSize
+	for t := mc.usage.head.next; t != mc.usage.tail; t = t.next {
+		logicStart := max(off, int64(logicChunkIndex)*chunkSize+t.StartOffset)
+		logicStop := min(off+int64(len(p)), memChunkBaseOffset+t.stopOffset)
+		if logicStart < logicStop {
+			copy(p[logicStart-off:logicStop-off], mc.buf[logicStart-memChunkBaseOffset:logicStop-memChunkBaseOffset])
+			maxStop = max(maxStop, logicStop)
+		}
+	}
+	return
+}
+
+func (mc *MemChunk) IsComplete(chunkSize int64) bool {
+	return mc.usage.IsComplete(chunkSize)
+}
+
+func (mc *MemChunk) SaveContent(saveFn SaveToStorageFunc, logicChunkIndex LogicChunkIndex, chunkSize int64) {
+	if saveFn == nil {
+		return
+	}
+	for t := mc.usage.head.next; t != mc.usage.tail; t = t.next {
+		reader := util.NewBytesReader(mc.buf[t.StartOffset:t.stopOffset])
+		saveFn(reader, int64(logicChunkIndex)*chunkSize+t.StartOffset, t.Size(), func() {
+		})
+	}
+}

weed/filesys/page_writer/upload_pipeline.go

@@ -15,7 +15,7 @@ type LogicChunkIndex int
 type UploadPipeline struct {
 	filepath             util.FullPath
 	ChunkSize            int64
-	writableChunks       map[LogicChunkIndex]*MemChunk
+	writableChunks       map[LogicChunkIndex]PageChunk
 	writableChunksLock   sync.Mutex
 	sealedChunks         map[LogicChunkIndex]*SealedChunk
 	sealedChunksLock     sync.Mutex
@@ -28,7 +28,7 @@ type UploadPipeline struct {
 }
 
 type SealedChunk struct {
-	chunk            *MemChunk
+	chunk            PageChunk
 	referenceCounter int // track uploading or reading processes
 }
 
@@ -36,14 +36,14 @@ func (sc *SealedChunk) FreeReference(messageOnFree string) {
 	sc.referenceCounter--
 	if sc.referenceCounter == 0 {
 		glog.V(4).Infof("Free sealed chunk: %s", messageOnFree)
-		mem.Free(sc.chunk.buf)
+		sc.chunk.FreeResource()
 	}
 }
 
 func NewUploadPipeline(filepath util.FullPath, writers *util.LimitedConcurrentExecutor, chunkSize int64, saveToStorageFn SaveToStorageFunc) *UploadPipeline {
 	return &UploadPipeline{
 		ChunkSize:         chunkSize,
-		writableChunks:    make(map[LogicChunkIndex]*MemChunk),
+		writableChunks:    make(map[LogicChunkIndex]PageChunk),
 		sealedChunks:      make(map[LogicChunkIndex]*SealedChunk),
 		uploaders:         writers,
 		uploaderCountCond: sync.NewCond(&sync.Mutex{}),
@@ -68,8 +68,7 @@ func (cw *UploadPipeline) SaveDataAt(p []byte, off int64) (n int) {
 		}
 		cw.writableChunks[logicChunkIndex] = memChunk
 	}
-	n = copy(memChunk.buf[offsetRemainder:], p)
-	memChunk.usage.MarkWritten(offsetRemainder, offsetRemainder+int64(n))
+	n = memChunk.WriteDataAt(p, offsetRemainder)
 	cw.maybeMoveToSealed(memChunk, logicChunkIndex)
 
 	return
@@ -86,7 +85,7 @@ func (cw *UploadPipeline) MaybeReadDataAt(p []byte, off int64) (maxStop int64) {
 	}
 	cw.sealedChunksLock.Unlock()
 	if found {
-		maxStop = readMemChunk(sealedChunk.chunk, p, off, logicChunkIndex, cw.ChunkSize)
+		maxStop = sealedChunk.chunk.ReadDataAt(p, off, logicChunkIndex, cw.ChunkSize)
 		glog.V(4).Infof("%s read sealed memchunk [%d,%d)", cw.filepath, off, maxStop)
 		sealedChunk.FreeReference(fmt.Sprintf("%s finish reading chunk %d", cw.filepath, logicChunkIndex))
 	}
@@ -98,7 +97,7 @@ func (cw *UploadPipeline) MaybeReadDataAt(p []byte, off int64) (maxStop int64) {
 	if !found {
 		return
 	}
-	writableMaxStop := readMemChunk(writableChunk, p, off, logicChunkIndex, cw.ChunkSize)
+	writableMaxStop := writableChunk.ReadDataAt(p, off, logicChunkIndex, cw.ChunkSize)
 	glog.V(4).Infof("%s read writable memchunk [%d,%d)", cw.filepath, off, writableMaxStop)
 	maxStop = max(maxStop, writableMaxStop)
 
@@ -174,13 +173,13 @@ func (cw *UploadPipeline) waitForCurrentWritersToComplete() {
 	cw.uploaderCountCond.L.Unlock()
 }
 
-func (cw *UploadPipeline) maybeMoveToSealed(memChunk *MemChunk, logicChunkIndex LogicChunkIndex) {
-	if memChunk.usage.IsComplete(cw.ChunkSize) {
+func (cw *UploadPipeline) maybeMoveToSealed(memChunk PageChunk, logicChunkIndex LogicChunkIndex) {
+	if memChunk.IsComplete(cw.ChunkSize) {
 		cw.moveToSealed(memChunk, logicChunkIndex)
 	}
 }
 
-func (cw *UploadPipeline) moveToSealed(memChunk *MemChunk, logicChunkIndex LogicChunkIndex) {
+func (cw *UploadPipeline) moveToSealed(memChunk PageChunk, logicChunkIndex LogicChunkIndex) {
 	atomic.AddInt32(&cw.uploaderCount, 1)
 	glog.V(4).Infof("%s uploaderCount %d ++> %d", cw.filepath, cw.uploaderCount-1, cw.uploaderCount)
 
@@ -200,7 +199,7 @@ func (cw *UploadPipeline) moveToSealed(memChunk *MemChunk, logicChunkIndex Logic
 
 	cw.uploaders.Execute(func() {
 		// first add to the file chunks
-		cw.saveOneChunk(sealedChunk.chunk, logicChunkIndex)
+		sealedChunk.chunk.SaveContent(cw.saveToStorageFn, logicChunkIndex, cw.ChunkSize)
 
 		// notify waiting process
 		atomic.AddInt32(&cw.uploaderCount, -1)
@@ -226,30 +225,6 @@ func (cw *UploadPipeline) moveToSealed(memChunk *MemChunk, logicChunkIndex Logic
 	})
 }
 
-func (cw *UploadPipeline) saveOneChunk(memChunk *MemChunk, logicChunkIndex LogicChunkIndex) {
-	if cw.saveToStorageFn == nil {
-		return
-	}
-	for t := memChunk.usage.head.next; t != memChunk.usage.tail; t = t.next {
-		reader := util.NewBytesReader(memChunk.buf[t.StartOffset:t.stopOffset])
-		cw.saveToStorageFn(reader, int64(logicChunkIndex)*cw.ChunkSize+t.StartOffset, t.Size(), func() {
-		})
-	}
-}
-
-func readMemChunk(memChunk *MemChunk, p []byte, off int64, logicChunkIndex LogicChunkIndex, chunkSize int64) (maxStop int64) {
-	memChunkBaseOffset := int64(logicChunkIndex) * chunkSize
-	for t := memChunk.usage.head.next; t != memChunk.usage.tail; t = t.next {
-		logicStart := max(off, int64(logicChunkIndex)*chunkSize+t.StartOffset)
-		logicStop := min(off+int64(len(p)), memChunkBaseOffset+t.stopOffset)
-		if logicStart < logicStop {
-			copy(p[logicStart-off:logicStop-off], memChunk.buf[logicStart-memChunkBaseOffset:logicStop-memChunkBaseOffset])
-			maxStop = max(maxStop, logicStop)
-		}
-	}
-	return
-}
-
 func (p2 *UploadPipeline) Shutdown() {
 
 }