mirror of https://github.com/ledisdb/ledisdb.git
146 lines
2.4 KiB
Go
146 lines
2.4 KiB
Go
package store
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import (
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"encoding/binary"
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"github.com/siddontang/goleveldb/leveldb"
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"github.com/siddontang/ledisdb/store/driver"
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"time"
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)
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type WriteBatch struct {
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wb driver.IWriteBatch
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st *Stat
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putNum int64
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deleteNum int64
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db *DB
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}
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func (wb *WriteBatch) Put(key []byte, value []byte) {
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wb.putNum++
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wb.wb.Put(key, value)
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}
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func (wb *WriteBatch) Delete(key []byte) {
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wb.deleteNum++
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wb.wb.Delete(key)
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}
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func (wb *WriteBatch) Commit() error {
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wb.st.BatchCommitNum.Add(1)
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wb.st.PutNum.Add(wb.putNum)
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wb.st.DeleteNum.Add(wb.deleteNum)
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wb.putNum = 0
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wb.deleteNum = 0
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var err error
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t := time.Now()
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if wb.db == nil || !wb.db.needSyncCommit() {
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err = wb.wb.Commit()
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} else {
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err = wb.wb.SyncCommit()
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}
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wb.st.BatchCommitTotalTime.Add(time.Now().Sub(t))
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return err
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}
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func (wb *WriteBatch) Rollback() error {
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wb.putNum = 0
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wb.deleteNum = 0
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return wb.wb.Rollback()
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}
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// the data will be undefined after commit or rollback
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func (wb *WriteBatch) BatchData() *BatchData {
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data := wb.wb.Data()
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d, err := NewBatchData(data)
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if err != nil {
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//can not enter this
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panic(err)
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}
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return d
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}
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func (wb *WriteBatch) Data() []byte {
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b := wb.BatchData()
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return b.Data()
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}
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const BatchDataHeadLen = 12
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/*
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see leveldb batch data format for more information
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*/
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type BatchData struct {
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leveldb.Batch
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}
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func NewBatchData(data []byte) (*BatchData, error) {
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b := new(BatchData)
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if err := b.Load(data); err != nil {
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return nil, err
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}
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return b, nil
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}
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func (d *BatchData) Append(do *BatchData) error {
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d1 := d.Dump()
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d2 := do.Dump()
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n := d.Len() + do.Len()
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d1 = append(d1, d2[BatchDataHeadLen:]...)
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binary.LittleEndian.PutUint32(d1[8:], uint32(n))
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return d.Load(d1)
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}
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func (d *BatchData) Data() []byte {
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return d.Dump()
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}
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func (d *BatchData) Reset() {
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d.Batch.Reset()
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}
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type BatchDataReplay interface {
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Put(key, value []byte)
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Delete(key []byte)
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}
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type BatchItem struct {
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Key []byte
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Value []byte
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}
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type batchItems []BatchItem
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func (bs *batchItems) Put(key, value []byte) {
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*bs = append(*bs, BatchItem{key, value})
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}
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func (bs *batchItems) Delete(key []byte) {
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*bs = append(*bs, BatchItem{key, nil})
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}
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func (d *BatchData) Replay(r BatchDataReplay) error {
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return d.Batch.Replay(r)
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}
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func (d *BatchData) Items() ([]BatchItem, error) {
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is := make(batchItems, 0, d.Len())
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if err := d.Replay(&is); err != nil {
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return nil, err
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}
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return []BatchItem(is), nil
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}
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