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// 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 goleveldb
import (
"fmt"
"github.com/blevesearch/bleve/index/store"
"github.com/syndtr/goleveldb/leveldb"
)
type Writer struct {
store *Store
}
func (w *Writer) NewBatch() store.KVBatch {
rv := Batch{
store: w.store,
merge: store.NewEmulatedMerge(w.store.mo),
batch: new(leveldb.Batch),
}
return &rv
}
func (w *Writer) NewBatchEx(options store.KVBatchOptions) ([]byte, store.KVBatch, error) {
return make([]byte, options.TotalBytes), w.NewBatch(), nil
}
func (w *Writer) ExecuteBatch(b store.KVBatch) error {
batch, ok := b.(*Batch)
if !ok {
return fmt.Errorf("wrong type of batch")
}
// first process merges
for k, mergeOps := range batch.merge.Merges {
kb := []byte(k)
existingVal, err := w.store.db.Get(kb, w.store.defaultReadOptions)
if err != nil && err != leveldb.ErrNotFound {
return err
}
mergedVal, fullMergeOk := w.store.mo.FullMerge(kb, existingVal, mergeOps)
if !fullMergeOk {
return fmt.Errorf("merge operator returned failure")
}
// add the final merge to this batch
batch.batch.Put(kb, mergedVal)
}
// now execute the batch
return w.store.db.Write(batch.batch, w.store.defaultWriteOptions)
}
func (w *Writer) Close() error {
return nil
}
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