frp/utils/metric/counter.go

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2017-03-23 02:01:25 +08:00
// Copyright 2017 fatedier, fatedier@gmail.com
//
// 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 metric
import (
"sync/atomic"
)
type Counter interface {
Count() int64
Inc(int64)
Dec(int64)
Snapshot() Counter
Clear()
}
func NewCounter() Counter {
return &StandardCounter{
count: 0,
}
}
type StandardCounter struct {
count int64
}
func (c *StandardCounter) Count() int64 {
return atomic.LoadInt64(&c.count)
}
func (c *StandardCounter) Inc(count int64) {
atomic.AddInt64(&c.count, count)
}
func (c *StandardCounter) Dec(count int64) {
atomic.AddInt64(&c.count, -count)
}
func (c *StandardCounter) Snapshot() Counter {
tmp := &StandardCounter{
count: atomic.LoadInt64(&c.count),
}
return tmp
}
func (c *StandardCounter) Clear() {
atomic.StoreInt64(&c.count, 0)
}