mirror of
https://github.com/seaweedfs/seaweedfs.git
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87 lines
2.2 KiB
Go
87 lines
2.2 KiB
Go
package storage
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import (
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"fmt"
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"io"
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"os"
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"sync"
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"github.com/chrislusf/seaweedfs/weed/storage/idx"
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"github.com/chrislusf/seaweedfs/weed/storage/needle_map"
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. "github.com/chrislusf/seaweedfs/weed/storage/types"
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)
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type NeedleMapKind int
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const (
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NeedleMapInMemory NeedleMapKind = iota
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NeedleMapLevelDb // small memory footprint, 4MB total, 1 write buffer, 3 block buffer
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NeedleMapLevelDbMedium // medium memory footprint, 8MB total, 3 write buffer, 5 block buffer
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NeedleMapLevelDbLarge // large memory footprint, 12MB total, 4write buffer, 8 block buffer
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)
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type NeedleMapper interface {
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Put(key NeedleId, offset Offset, size Size) error
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Get(key NeedleId) (element *needle_map.NeedleValue, ok bool)
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Delete(key NeedleId, offset Offset) error
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Close()
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Destroy() error
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ContentSize() uint64
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DeletedSize() uint64
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FileCount() int
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DeletedCount() int
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MaxFileKey() NeedleId
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IndexFileSize() uint64
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Sync() error
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ReadIndexEntry(n int64) (key NeedleId, offset Offset, size Size, err error)
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}
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type baseNeedleMapper struct {
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mapMetric
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indexFile *os.File
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indexFileAccessLock sync.Mutex
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}
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func (nm *baseNeedleMapper) IndexFileSize() uint64 {
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stat, err := nm.indexFile.Stat()
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if err == nil {
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return uint64(stat.Size())
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}
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return 0
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}
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func (nm *baseNeedleMapper) appendToIndexFile(key NeedleId, offset Offset, size Size) error {
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bytes := needle_map.ToBytes(key, offset, size)
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nm.indexFileAccessLock.Lock()
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defer nm.indexFileAccessLock.Unlock()
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if _, err := nm.indexFile.Seek(0, 2); err != nil {
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return fmt.Errorf("cannot seek end of indexfile %s: %v",
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nm.indexFile.Name(), err)
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}
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_, err := nm.indexFile.Write(bytes)
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return err
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}
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func (nm *baseNeedleMapper) Sync() error {
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return nm.indexFile.Sync()
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}
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func (nm *baseNeedleMapper) ReadIndexEntry(n int64) (key NeedleId, offset Offset, size Size, err error) {
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bytes := make([]byte, NeedleMapEntrySize)
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var readCount int
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if readCount, err = nm.indexFile.ReadAt(bytes, n*NeedleMapEntrySize); err != nil {
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if err == io.EOF {
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if readCount == NeedleMapEntrySize {
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err = nil
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}
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}
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if err != nil {
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return
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}
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}
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key, offset, size = idx.IdxFileEntry(bytes)
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return
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}
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