70 lines
1.5 KiB
Go
70 lines
1.5 KiB
Go
|
// Copyright (c) 2014 Couchbase, Inc.
|
||
|
|
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
|
||
|
|
// except in compliance with the License. You may obtain a copy of the License at
|
||
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
// Unless required by applicable law or agreed to in writing, software distributed under the
|
||
|
|
// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
|
||
|
|
// either express or implied. See the License for the specific language governing permissions
|
||
|
|
// and limitations under the License.
|
||
|
|
|
||
|
|
package store
|
||
|
|
|
||
|
|
type op struct {
|
||
|
|
K []byte
|
||
|
|
V []byte
|
||
|
|
}
|
||
|
|
|
||
|
|
type EmulatedBatch struct {
|
||
|
|
w KVWriter
|
||
|
|
ops []*op
|
||
|
|
merge *EmulatedMerge
|
||
|
|
}
|
||
|
|
|
||
|
|
func NewEmulatedBatch(w KVWriter, mo MergeOperator) *EmulatedBatch {
|
||
|
|
return &EmulatedBatch{
|
||
|
|
w: w,
|
||
|
|
ops: make([]*op, 0, 1000),
|
||
|
|
merge: NewEmulatedMerge(mo),
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func (b *EmulatedBatch) Set(key, val []byte) {
|
||
|
|
b.ops = append(b.ops, &op{key, val})
|
||
|
|
}
|
||
|
|
|
||
|
|
func (b *EmulatedBatch) Delete(key []byte) {
|
||
|
|
b.ops = append(b.ops, &op{key, nil})
|
||
|
|
}
|
||
|
|
|
||
|
|
func (b *EmulatedBatch) Merge(key, val []byte) {
|
||
|
|
b.merge.Merge(key, val)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (b *EmulatedBatch) Execute() error {
|
||
|
|
// first process merges
|
||
|
|
err := b.merge.Execute(b.w)
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
// now apply all the ops
|
||
|
|
for _, op := range b.ops {
|
||
|
|
if op.V != nil {
|
||
|
|
err := b.w.Set(op.K, op.V)
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
err := b.w.Delete(op.K)
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (b *EmulatedBatch) Close() error {
|
||
|
|
return nil
|
||
|
|
}
|