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writer.go
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/
writer.go
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// Copyright (c) 2016 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 moss
import (
"fmt"
"github.com/edwindvinas/bleve/index/store"
"github.com/couchbase/moss"
)
type Writer struct {
s *Store
}
func (w *Writer) NewBatch() store.KVBatch {
b, err := w.s.ms.NewBatch(0, 0)
if err != nil {
return nil
}
return &Batch{
store: w.s,
merge: store.NewEmulatedMerge(w.s.mo),
batch: b,
}
}
func (w *Writer) NewBatchEx(options store.KVBatchOptions) (
[]byte, store.KVBatch, error) {
numOps := options.NumSets + options.NumDeletes + options.NumMerges
b, err := w.s.ms.NewBatch(numOps, options.TotalBytes)
if err != nil {
return nil, nil, err
}
buf, err := b.Alloc(options.TotalBytes)
if err != nil {
return nil, nil, err
}
return buf, &Batch{
store: w.s,
merge: store.NewEmulatedMerge(w.s.mo),
batch: b,
buf: buf,
bufUsed: 0,
}, nil
}
func (w *Writer) ExecuteBatch(b store.KVBatch) (err error) {
batch, ok := b.(*Batch)
if !ok {
return fmt.Errorf("wrong type of batch")
}
for kStr, mergeOps := range batch.merge.Merges {
for _, v := range mergeOps {
if batch.buf != nil {
kLen := len(kStr)
vLen := len(v)
kBuf := batch.buf[batch.bufUsed : batch.bufUsed+kLen]
vBuf := batch.buf[batch.bufUsed+kLen : batch.bufUsed+kLen+vLen]
copy(kBuf, kStr)
copy(vBuf, v)
batch.bufUsed += kLen + vLen
err = batch.batch.AllocMerge(kBuf, vBuf)
} else {
err = batch.batch.Merge([]byte(kStr), v)
}
if err != nil {
return err
}
}
}
return w.s.ms.ExecuteBatch(batch.batch, moss.WriteOptions{})
}
func (w *Writer) Close() error {
w.s = nil
return nil
}