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134 lines
3.2 KiB
134 lines
3.2 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/go/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
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NeedleMapBoltDb
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)
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type NeedleMapper interface {
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Put(key uint64, offset uint32, size uint32) error
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Get(key uint64) (element *NeedleValue, ok bool)
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Delete(key uint64) 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() uint64
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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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mutex sync.RWMutex
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deletionCounter int `json:"DeletionCounter"`
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fileCounter int `json:"FileCounter"`
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deletionByteCounter uint64 `json:"DeletionByteCounter"`
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fileByteCounter uint64 `json:"FileByteCounter"`
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maximumFileKey uint64 `json:"MaxFileKey"`
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}
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func (nm *baseNeedleMapper) IndexFileSize() uint64 {
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nm.mutex.RLock()
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defer nm.mutex.RUnlock()
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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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nm.mutex.RLock()
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defer nm.mutex.RUnlock()
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return nm.indexFile.Name()
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}
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func idxFileEntry(bytes []byte) (key uint64, offset uint32, size uint32) {
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key = util.BytesToUint64(bytes[:8])
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offset = util.BytesToUint32(bytes[8:12])
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size = util.BytesToUint32(bytes[12:16])
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return
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}
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func (nm *baseNeedleMapper) appendToIndexFile(key uint64, offset uint32, size uint32) error {
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bytes := make([]byte, 16)
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util.Uint64toBytes(bytes[0:8], key)
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util.Uint32toBytes(bytes[8:12], offset)
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util.Uint32toBytes(bytes[12:16], size)
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nm.mutex.Lock()
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defer nm.mutex.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.mutex.RLock()
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defer nm.mutex.RUnlock()
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return ioutil.ReadFile(nm.indexFile.Name())
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}
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func (nm *baseNeedleMapper) logDelete(deletedByteCount uint32) {
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nm.mutex.Lock()
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defer nm.mutex.Unlock()
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nm.deletionByteCounter = nm.deletionByteCounter + uint64(deletedByteCount)
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nm.deletionCounter++
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}
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func (nm *baseNeedleMapper) logPut(key uint64, oldSize uint32, newSize uint32) {
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nm.mutex.Lock()
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defer nm.mutex.Unlock()
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if key > nm.maximumFileKey {
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nm.maximumFileKey = key
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}
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nm.fileCounter++
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nm.fileByteCounter = nm.fileByteCounter + uint64(newSize)
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if oldSize > 0 {
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nm.deletionCounter++
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nm.deletionByteCounter = nm.deletionByteCounter + uint64(oldSize)
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}
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}
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func (nm *baseNeedleMapper) ContentSize() uint64 {
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nm.mutex.RLock()
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defer nm.mutex.RUnlock()
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return nm.fileByteCounter
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}
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func (nm *baseNeedleMapper) DeletedSize() uint64 {
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nm.mutex.RLock()
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defer nm.mutex.RUnlock()
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return nm.deletionByteCounter
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}
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func (nm *baseNeedleMapper) FileCount() int {
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nm.mutex.RLock()
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defer nm.mutex.RUnlock()
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return nm.fileCounter
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}
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func (nm *baseNeedleMapper) DeletedCount() int {
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nm.mutex.RLock()
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defer nm.mutex.RUnlock()
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return nm.deletionCounter
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}
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func (nm *baseNeedleMapper) MaxFileKey() uint64 {
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nm.mutex.RLock()
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defer nm.mutex.RUnlock()
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return nm.maximumFileKey
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}
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