Method Compact

internal/utils/bfs/meta_file.go:304–341

Compact the meta file TODO 考虑自动Compact的时机（脏数据比例？）

()

// Compact the meta file
// TODO 考虑自动Compact的时机（脏数据比例？）
func (this *MetaFile) Compact() error {
	this.mu.Lock()
	defer this.mu.Unlock()

	var buf = bytes.NewBuffer(nil)
	for hash, lazyHeader := range this.headerMap {
		header, err := lazyHeader.FileHeaderUnsafe()
		if err != nil {
			return err
		}

		blockBytes, err := header.Encode(hash)
		if err != nil {
			return err
		}
		buf.Write(blockBytes)
	}

	AckWriteThread()
	err := this.fp.Truncate(int64(buf.Len()))
	ReleaseWriteThread()
	if err != nil {
		return err
	}

	AckReadThread()
	_, err = this.fp.Seek(0, io.SeekStart)
	ReleaseReadThread()
	if err != nil {
		return err
	}

	AckWriteThread()
	_, err = this.fp.Write(buf.Bytes())
	ReleaseWriteThread()
	this.isModified = true
	return err
}

func (this *MetaFile) SyncUnsafe() error {
	if !this.isModified {