prometheus/storage/raw/leveldb/batch.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"
	"github.com/jmhodges/levigo"
	"github.com/prometheus/prometheus/coding"
)

type batch struct {
	batch *levigo.WriteBatch
	drops uint32
	puts  uint32
}

func NewBatch() *batch {
	return &batch{
		batch: levigo.NewWriteBatch(),
	}
}

func (b *batch) Drop(key coding.Encoder) {
	keyEncoded := key.MustEncode()
	b.drops++

	b.batch.Delete(keyEncoded)
}

func (b *batch) Put(key, value coding.Encoder) {
	keyEncoded := key.MustEncode()
	valueEncoded := value.MustEncode()
	b.puts++

	b.batch.Put(keyEncoded, valueEncoded)
}

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)
}