2014-10-31 14:42:32 +01:00
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// 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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// +build forestdb
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package forestdb
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import (
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"fmt"
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)
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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 Batch struct {
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s *Store
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ops []op
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merges map[string][][]byte
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}
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func (b *Batch) Set(k, v []byte) {
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b.ops = append(b.ops, op{k, v})
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}
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func (b *Batch) Delete(k []byte) {
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b.ops = append(b.ops, op{k, nil})
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}
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func (b *Batch) Merge(key, val []byte) {
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ops, ok := b.merges[string(key)]
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if ok && len(ops) > 0 {
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last := ops[len(ops)-1]
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mergedVal, partialMergeOk := b.s.mo.PartialMerge(key, last, val)
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if partialMergeOk {
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// replace last entry with the result of the merge
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ops[len(ops)-1] = mergedVal
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} else {
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// could not partial merge, append this to the end
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ops = append(ops, val)
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}
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} else {
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ops = [][]byte{val}
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}
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b.merges[string(key)] = ops
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}
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func (b *Batch) Execute() (err error) {
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for k, mergeOps := range b.merges {
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kb := []byte(k)
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existingVal, err := b.s.get(kb)
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if err != nil {
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return err
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}
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mergedVal, fullMergeOk := b.s.mo.FullMerge(kb, existingVal, mergeOps)
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if !fullMergeOk {
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return fmt.Errorf("merge operator returned failure")
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}
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err = b.s.setlocked(kb, mergedVal)
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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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for _, op := range b.ops {
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if op.v != nil {
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b.s.setlocked(op.k, op.v)
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} else {
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b.s.deletelocked(op.k)
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}
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}
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return b.s.commit()
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}
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func (b *Batch) Close() error {
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return nil
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}
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