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74 lines
1.3 KiB
74 lines
1.3 KiB
package db
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import "sync"
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type atomicSetDeleter interface {
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Mutex() *sync.Mutex
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SetNoLock(key, value []byte)
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SetNoLockSync(key, value []byte)
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DeleteNoLock(key []byte)
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DeleteNoLockSync(key []byte)
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}
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type memBatch struct {
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db atomicSetDeleter
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ops []operation
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}
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type opType int
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const (
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opTypeSet opType = 1
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opTypeDelete opType = 2
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)
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type operation struct {
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opType
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key []byte
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value []byte
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}
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func (mBatch *memBatch) Set(key, value []byte) {
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mBatch.ops = append(mBatch.ops, operation{opTypeSet, key, value})
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}
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func (mBatch *memBatch) Delete(key []byte) {
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mBatch.ops = append(mBatch.ops, operation{opTypeDelete, key, nil})
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}
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func (mBatch *memBatch) Write() {
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mBatch.write(false)
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}
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func (mBatch *memBatch) WriteSync() {
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mBatch.write(true)
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}
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func (mBatch *memBatch) Close() {
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mBatch.ops = nil
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}
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func (mBatch *memBatch) write(doSync bool) {
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if mtx := mBatch.db.Mutex(); mtx != nil {
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mtx.Lock()
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defer mtx.Unlock()
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}
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for i, op := range mBatch.ops {
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if doSync && i == (len(mBatch.ops)-1) {
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switch op.opType {
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case opTypeSet:
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mBatch.db.SetNoLockSync(op.key, op.value)
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case opTypeDelete:
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mBatch.db.DeleteNoLockSync(op.key)
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}
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break // we're done.
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}
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switch op.opType {
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case opTypeSet:
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mBatch.db.SetNoLock(op.key, op.value)
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case opTypeDelete:
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mBatch.db.DeleteNoLock(op.key)
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}
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}
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}
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