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