98 lines
2.1 KiB
Go
98 lines
2.1 KiB
Go
// Copyright (c) 2016 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 moss
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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/couchbase/moss"
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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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b, err := w.s.ms.NewBatch(0, 0)
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if err != nil {
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return nil
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}
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return &Batch{
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store: w.s,
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merge: store.NewEmulatedMerge(w.s.mo),
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batch: b,
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}
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}
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func (w *Writer) NewBatchEx(options store.KVBatchOptions) (
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[]byte, store.KVBatch, error) {
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numOps := options.NumSets + options.NumDeletes + options.NumMerges
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b, err := w.s.ms.NewBatch(numOps, options.TotalBytes)
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if err != nil {
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return nil, nil, err
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}
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buf, err := b.Alloc(options.TotalBytes)
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if err != nil {
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return nil, nil, err
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}
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return buf, &Batch{
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store: w.s,
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merge: store.NewEmulatedMerge(w.s.mo),
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batch: b,
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buf: buf,
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bufUsed: 0,
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}, nil
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}
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func (w *Writer) ExecuteBatch(b store.KVBatch) (err 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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for kStr, mergeOps := range batch.merge.Merges {
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for _, v := range mergeOps {
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if batch.buf != nil {
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kLen := len(kStr)
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vLen := len(v)
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kBuf := batch.buf[batch.bufUsed : batch.bufUsed+kLen]
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vBuf := batch.buf[batch.bufUsed+kLen : batch.bufUsed+kLen+vLen]
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copy(kBuf, kStr)
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copy(vBuf, v)
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batch.bufUsed += kLen + vLen
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err = batch.batch.AllocMerge(kBuf, vBuf)
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} else {
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err = batch.batch.Merge([]byte(kStr), v)
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}
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if err != nil {
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return err
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}
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}
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}
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return w.s.ms.ExecuteBatch(batch.batch, moss.WriteOptions{})
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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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