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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 boltdb
import (
"fmt"
"github.com/blevesearch/bleve/index/store"
)
type Writer struct {
store *Store
}
func (w *Writer) NewBatch() store.KVBatch {
return store.NewEmulatedBatch(w.store.mo)
}
func (w *Writer) NewBatchEx(options store.KVBatchOptions) ([]byte, store.KVBatch, error) {
return make([]byte, options.TotalBytes), w.NewBatch(), nil
}
func (w *Writer) ExecuteBatch(batch store.KVBatch) (err error) {
emulatedBatch, ok := batch.(*store.EmulatedBatch)
if !ok {
return fmt.Errorf("wrong type of batch")
}
tx, err := w.store.db.Begin(true)
if err != nil {
return
}
// defer function to ensure that once started,
// we either Commit tx or Rollback
defer func() {
// if nothing went wrong, commit
if err == nil {
// careful to catch error here too
err = tx.Commit()
} else {
// caller should see error that caused abort,
// not success or failure of Rollback itself
_ = tx.Rollback()
}
}()
bucket := tx.Bucket([]byte(w.store.bucket))
bucket.FillPercent = w.store.fillPercent
for k, mergeOps := range emulatedBatch.Merger.Merges {
kb := []byte(k)
existingVal := bucket.Get(kb)
mergedVal, fullMergeOk := w.store.mo.FullMerge(kb, existingVal, mergeOps)
if !fullMergeOk {
err = fmt.Errorf("merge operator returned failure")
return
}
err = bucket.Put(kb, mergedVal)
if err != nil {
return
}
}
for _, op := range emulatedBatch.Ops {
if op.V != nil {
err = bucket.Put(op.K, op.V)
if err != nil {
return
}
} else {
err = bucket.Delete(op.K)
if err != nil {
return
}
}
}
return
}
func (w *Writer) Close() error {
return nil
}
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