114 lines
2.5 KiB
Go
114 lines
2.5 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 boltdb
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import (
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indexStore "github.com/blevesearch/bleve/index/store"
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"github.com/boltdb/bolt"
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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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store *Store
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alreadyLocked bool
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ops []op
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merges map[string]indexStore.AssociativeMergeChain
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}
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func newBatch(store *Store) *Batch {
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rv := Batch{
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store: store,
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ops: make([]op, 0),
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merges: make(map[string]indexStore.AssociativeMergeChain),
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}
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return &rv
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}
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func newBatchAlreadyLocked(store *Store) *Batch {
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rv := Batch{
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store: store,
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alreadyLocked: true,
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ops: make([]op, 0),
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merges: make(map[string]indexStore.AssociativeMergeChain),
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}
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return &rv
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}
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func (i *Batch) Set(key, val []byte) {
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i.ops = append(i.ops, op{key, val})
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}
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func (i *Batch) Delete(key []byte) {
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i.ops = append(i.ops, op{key, nil})
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}
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func (i *Batch) Merge(key []byte, oper indexStore.AssociativeMerge) {
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opers, ok := i.merges[string(key)]
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if !ok {
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opers = make(indexStore.AssociativeMergeChain, 0, 1)
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}
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opers = append(opers, oper)
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i.merges[string(key)] = opers
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}
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func (i *Batch) Execute() error {
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if !i.alreadyLocked {
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i.store.writer.Lock()
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defer i.store.writer.Unlock()
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}
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return i.store.db.Update(func(tx *bolt.Tx) error {
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b := tx.Bucket([]byte(i.store.bucket))
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// first process the merges
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for k, mc := range i.merges {
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val := b.Get([]byte(k))
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var err error
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val, err = mc.Merge([]byte(k), val)
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if err != nil {
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return err
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}
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if val == nil {
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err := b.Delete([]byte(k))
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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.Put([]byte(k), val)
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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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// now process the regular get/set ops
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for _, o := range i.ops {
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if o.v == nil {
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if err := b.Delete(o.k); err != nil {
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return err
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}
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} else {
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if err := b.Put(o.k, o.v); 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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}
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func (i *Batch) Close() error {
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return nil
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}
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