69 lines
1.8 KiB
Go
69 lines
1.8 KiB
Go
// Copyright (c) 2014 Couchbase, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package goleveldb
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import (
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"fmt"
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"github.com/blevesearch/bleve/index/store"
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"github.com/syndtr/goleveldb/leveldb"
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)
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type Writer struct {
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store *Store
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}
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func (w *Writer) NewBatch() store.KVBatch {
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rv := Batch{
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store: w.store,
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merge: store.NewEmulatedMerge(w.store.mo),
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batch: new(leveldb.Batch),
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}
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return &rv
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}
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func (w *Writer) NewBatchEx(options store.KVBatchOptions) ([]byte, store.KVBatch, error) {
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return make([]byte, options.TotalBytes), w.NewBatch(), nil
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}
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func (w *Writer) ExecuteBatch(b store.KVBatch) error {
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batch, ok := b.(*Batch)
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if !ok {
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return fmt.Errorf("wrong type of batch")
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}
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// first process merges
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for k, mergeOps := range batch.merge.Merges {
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kb := []byte(k)
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existingVal, err := w.store.db.Get(kb, w.store.defaultReadOptions)
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if err != nil && err != leveldb.ErrNotFound {
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return err
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}
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mergedVal, fullMergeOk := w.store.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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// add the final merge to this batch
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batch.batch.Put(kb, mergedVal)
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}
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// now execute the batch
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return w.store.db.Write(batch.batch, w.store.defaultWriteOptions)
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}
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func (w *Writer) Close() error {
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return nil
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}
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