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60 lines
1.3 KiB
60 lines
1.3 KiB
// Copyright 2017 fatedier, fatedier@gmail.com |
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// |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// http://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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package metric |
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import ( |
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"sync/atomic" |
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) |
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type Counter interface { |
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Count() int32 |
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Inc(int32) |
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Dec(int32) |
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Snapshot() Counter |
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Clear() |
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} |
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func NewCounter() Counter { |
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return &StandardCounter{ |
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count: 0, |
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} |
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} |
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type StandardCounter struct { |
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count int32 |
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} |
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func (c *StandardCounter) Count() int32 { |
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return atomic.LoadInt32(&c.count) |
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} |
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func (c *StandardCounter) Inc(count int32) { |
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atomic.AddInt32(&c.count, count) |
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} |
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func (c *StandardCounter) Dec(count int32) { |
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atomic.AddInt32(&c.count, -count) |
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} |
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func (c *StandardCounter) Snapshot() Counter { |
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tmp := &StandardCounter{ |
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count: atomic.LoadInt32(&c.count), |
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} |
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return tmp |
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} |
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func (c *StandardCounter) Clear() { |
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atomic.StoreInt32(&c.count, 0) |
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}
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