sequence_number.go

// Copyright 2015 Google Inc. All Rights Reserved.
//
// 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 influxdb

import (
	"sync"
)

type metricSequenceNum interface {
	Get(metric string) uint64
}

type realMetricSequenceNum struct {
	store map[string]uint64
	lock  sync.Mutex
}

func (self *realMetricSequenceNum) Get(metric string) uint64 {
	self.lock.Lock()
	defer self.lock.Unlock()
	ret := self.store[metric]
	self.store[metric]++
	return ret
}

func newMetricSequenceNum() metricSequenceNum {
	return &realMetricSequenceNum{store: make(map[string]uint64)}
}