package page_writer import ( "github.com/seaweedfs/seaweedfs/weed/util" "github.com/seaweedfs/seaweedfs/weed/util/mem" "sync" "sync/atomic" ) var ( _ = PageChunk(&MemChunk{}) memChunkCounter int64 ) type MemChunk struct { sync.RWMutex buf []byte usage *ChunkWrittenIntervalList chunkSize int64 logicChunkIndex LogicChunkIndex activityScore *ActivityScore } func NewMemChunk(logicChunkIndex LogicChunkIndex, chunkSize int64) *MemChunk { atomic.AddInt64(&memChunkCounter, 1) return &MemChunk{ logicChunkIndex: logicChunkIndex, chunkSize: chunkSize, buf: mem.Allocate(int(chunkSize)), usage: newChunkWrittenIntervalList(), activityScore: NewActivityScore(), } } func (mc *MemChunk) FreeResource() { mc.Lock() defer mc.Unlock() atomic.AddInt64(&memChunkCounter, -1) mem.Free(mc.buf) } func (mc *MemChunk) WriteDataAt(src []byte, offset int64, tsNs int64) (n int) { mc.Lock() defer mc.Unlock() innerOffset := offset % mc.chunkSize n = copy(mc.buf[innerOffset:], src) mc.usage.MarkWritten(innerOffset, innerOffset+int64(n), tsNs) mc.activityScore.MarkWrite() return } func (mc *MemChunk) ReadDataAt(p []byte, off int64, tsNs int64) (maxStop int64) { mc.RLock() defer mc.RUnlock() memChunkBaseOffset := int64(mc.logicChunkIndex) * mc.chunkSize for t := mc.usage.head.next; t != mc.usage.tail; t = t.next { logicStart := max(off, memChunkBaseOffset+t.StartOffset) logicStop := min(off+int64(len(p)), memChunkBaseOffset+t.stopOffset) if logicStart < logicStop { if t.TsNs >= tsNs { copy(p[logicStart-off:logicStop-off], mc.buf[logicStart-memChunkBaseOffset:logicStop-memChunkBaseOffset]) maxStop = max(maxStop, logicStop) } else { println("read old data1", tsNs-t.TsNs, "ns") } } } mc.activityScore.MarkRead() return } func (mc *MemChunk) IsComplete() bool { mc.RLock() defer mc.RUnlock() return mc.usage.IsComplete(mc.chunkSize) } func (mc *MemChunk) ActivityScore() int64 { return mc.activityScore.ActivityScore() } func (mc *MemChunk) WrittenSize() int64 { mc.RLock() defer mc.RUnlock() return mc.usage.WrittenSize() } func (mc *MemChunk) SaveContent(saveFn SaveToStorageFunc) { mc.RLock() defer mc.RUnlock() 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(mc.logicChunkIndex)*mc.chunkSize+t.StartOffset, t.Size(), t.TsNs, func() { }) } }