refactor

weed/filesys/dirty_pages_continuous.go

@@ -0,0 +1,150 @@
+package filesys
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"sync"
+	"time"
+
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+)
+
+type ContinuousDirtyPages struct {
+	intervals      *ContinuousIntervals
+	f              *File
+	writeOnly      bool
+	writeWaitGroup sync.WaitGroup
+	chunkAddLock   sync.Mutex
+	lastErr        error
+	collection     string
+	replication    string
+}
+
+func newContinuousDirtyPages(file *File, writeOnly bool) *ContinuousDirtyPages {
+	dirtyPages := &ContinuousDirtyPages{
+		intervals: &ContinuousIntervals{},
+		f:         file,
+		writeOnly: writeOnly,
+	}
+	return dirtyPages
+}
+
+func (pages *ContinuousDirtyPages) AddPage(offset int64, data []byte) {
+
+	glog.V(4).Infof("%s AddPage [%d,%d)", pages.f.fullpath(), offset, offset+int64(len(data)))
+
+	if len(data) > int(pages.f.wfs.option.ChunkSizeLimit) {
+		// this is more than what buffer can hold.
+		pages.flushAndSave(offset, data)
+	}
+
+	pages.intervals.AddInterval(data, offset)
+
+	if pages.intervals.TotalSize() >= pages.f.wfs.option.ChunkSizeLimit {
+		pages.saveExistingLargestPageToStorage()
+	}
+
+	return
+}
+
+func (pages *ContinuousDirtyPages) flushAndSave(offset int64, data []byte) {
+
+	// flush existing
+	pages.saveExistingPagesToStorage()
+
+	// flush the new page
+	pages.saveToStorage(bytes.NewReader(data), offset, int64(len(data)))
+
+	return
+}
+
+func (pages *ContinuousDirtyPages) FlushData() error {
+
+	pages.saveExistingPagesToStorage()
+	pages.writeWaitGroup.Wait()
+	if pages.lastErr != nil {
+		return fmt.Errorf("flush data: %v", pages.lastErr)
+	}
+	return nil
+}
+
+func (pages *ContinuousDirtyPages) saveExistingPagesToStorage() {
+	for pages.saveExistingLargestPageToStorage() {
+	}
+}
+
+func (pages *ContinuousDirtyPages) saveExistingLargestPageToStorage() (hasSavedData bool) {
+
+	maxList := pages.intervals.RemoveLargestIntervalLinkedList()
+	if maxList == nil {
+		return false
+	}
+
+	entry := pages.f.getEntry()
+	if entry == nil {
+		return false
+	}
+
+	fileSize := int64(entry.Attributes.FileSize)
+
+	chunkSize := min(maxList.Size(), fileSize-maxList.Offset())
+	if chunkSize == 0 {
+		return false
+	}
+
+	pages.saveToStorage(maxList.ToReader(), maxList.Offset(), chunkSize)
+
+	return true
+}
+
+func (pages *ContinuousDirtyPages) saveToStorage(reader io.Reader, offset int64, size int64) {
+
+	mtime := time.Now().UnixNano()
+	pages.writeWaitGroup.Add(1)
+	writer := func() {
+		defer pages.writeWaitGroup.Done()
+
+		reader = io.LimitReader(reader, size)
+		chunk, collection, replication, err := pages.f.wfs.saveDataAsChunk(pages.f.fullpath(), pages.writeOnly)(reader, pages.f.Name, offset)
+		if err != nil {
+			glog.V(0).Infof("%s saveToStorage [%d,%d): %v", pages.f.fullpath(), offset, offset+size, err)
+			pages.lastErr = err
+			return
+		}
+		chunk.Mtime = mtime
+		pages.collection, pages.replication = collection, replication
+		pages.chunkAddLock.Lock()
+		defer pages.chunkAddLock.Unlock()
+		pages.f.addChunks([]*filer_pb.FileChunk{chunk})
+		glog.V(3).Infof("%s saveToStorage [%d,%d)", pages.f.fullpath(), offset, offset+size)
+	}
+
+	if pages.f.wfs.concurrentWriters != nil {
+		pages.f.wfs.concurrentWriters.Execute(writer)
+	} else {
+		go writer()
+	}
+}
+
+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
+}
+
+func (pages *ContinuousDirtyPages) ReadDirtyDataAt(data []byte, startOffset int64) (maxStop int64) {
+	return pages.intervals.ReadDataAt(data, startOffset)
+}
+
+func (pages *ContinuousDirtyPages) GetStorageOptions() (collection, replication string) {
+	return pages.collection, pages.replication
+}