prometheus/storage/raw/leveldb/batch.go

76 lines
1.5 KiB
Go

// Copyright 2013 Prometheus Team
// 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 leveldb
import (
"fmt"
"code.google.com/p/goprotobuf/proto"
"github.com/jmhodges/levigo"
)
type batch struct {
batch *levigo.WriteBatch
drops uint32
puts uint32
}
func NewBatch() *batch {
return &batch{
batch: levigo.NewWriteBatch(),
}
}
func (b *batch) Drop(key proto.Message) {
buf, _ := buffers.Get()
defer buffers.Give(buf)
if err := buf.Marshal(key); err != nil {
panic(err)
}
b.batch.Delete(buf.Bytes())
b.drops++
}
func (b *batch) Put(key, value proto.Message) {
keyBuf, _ := buffers.Get()
defer buffers.Give(keyBuf)
if err := keyBuf.Marshal(key); err != nil {
panic(err)
}
valBuf, _ := buffers.Get()
defer buffers.Give(valBuf)
if err := valBuf.Marshal(value); err != nil {
panic(err)
}
b.batch.Put(keyBuf.Bytes(), valBuf.Bytes())
b.puts++
}
func (b *batch) Close() {
b.batch.Close()
}
func (b *batch) String() string {
return fmt.Sprintf("LevelDB batch with %d puts and %d drops.", b.puts, b.drops)
}