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77 lines
2.0 KiB
77 lines
2.0 KiB
// Copyright (c) 2015 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 gtreap provides an in-memory implementation of the
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// KVStore interfaces using the gtreap balanced-binary treap,
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// copy-on-write data structure.
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package gtreap
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import (
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"fmt"
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"math/rand"
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"github.com/blevesearch/upsidedown_store_api"
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)
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type Writer struct {
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s *Store
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}
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func (w *Writer) NewBatch() store.KVBatch {
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return store.NewEmulatedBatch(w.s.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) 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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w.s.m.Lock()
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for k, mergeOps := range emulatedBatch.Merger.Merges {
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kb := []byte(k)
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var existingVal []byte
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existingItem := w.s.t.Get(&Item{k: kb})
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if existingItem != nil {
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existingVal = w.s.t.Get(&Item{k: kb}).(*Item).v
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}
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mergedVal, fullMergeOk := w.s.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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w.s.t = w.s.t.Upsert(&Item{k: kb, v: mergedVal}, rand.Int())
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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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w.s.t = w.s.t.Upsert(&Item{k: op.K, v: op.V}, rand.Int())
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} else {
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w.s.t = w.s.t.Delete(&Item{k: op.K})
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}
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}
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w.s.m.Unlock()
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return nil
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}
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func (w *Writer) Close() error {
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w.s = nil
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return nil
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}
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