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