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83 lines
2.4 KiB
83 lines
2.4 KiB
package storage
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import (
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"fmt"
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"io/ioutil"
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"os"
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"sync"
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"github.com/chrislusf/seaweedfs/weed/storage/needle"
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. "github.com/chrislusf/seaweedfs/weed/storage/types"
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"github.com/chrislusf/seaweedfs/weed/util"
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)
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type NeedleMapType int
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const (
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NeedleMapInMemory NeedleMapType = 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 uint32) error
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Get(key NeedleId) (element *needle.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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IndexFileContent() ([]byte, error)
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IndexFileName() string
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}
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type baseNeedleMapper struct {
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indexFile *os.File
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indexFileAccessLock sync.Mutex
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mapMetric
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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) IndexFileName() string {
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return nm.indexFile.Name()
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}
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func IdxFileEntry(bytes []byte) (key NeedleId, offset Offset, size uint32) {
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key = BytesToNeedleId(bytes[:NeedleIdSize])
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offset = BytesToOffset(bytes[NeedleIdSize : NeedleIdSize+OffsetSize])
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size = util.BytesToUint32(bytes[NeedleIdSize+OffsetSize : NeedleIdSize+OffsetSize+SizeSize])
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return
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}
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func (nm *baseNeedleMapper) appendToIndexFile(key NeedleId, offset Offset, size uint32) error {
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bytes := make([]byte, NeedleIdSize+OffsetSize+SizeSize)
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NeedleIdToBytes(bytes[0:NeedleIdSize], key)
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OffsetToBytes(bytes[NeedleIdSize:NeedleIdSize+OffsetSize], offset)
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util.Uint32toBytes(bytes[NeedleIdSize+OffsetSize:NeedleIdSize+OffsetSize+SizeSize], 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) IndexFileContent() ([]byte, error) {
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nm.indexFileAccessLock.Lock()
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defer nm.indexFileAccessLock.Unlock()
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return ioutil.ReadFile(nm.indexFile.Name())
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}
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