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34 lines
978 B
34 lines
978 B
6 years ago
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// Copyright (c) 2017 Uber Technologies, Inc.
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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 metrics
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import (
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"time"
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)
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// Timer accumulates observations about how long some operation took,
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// and also maintains a historgam of percentiles.
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type Timer interface {
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// Records the time passed in.
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Record(time.Duration)
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}
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// NullTimer timer that does nothing
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var NullTimer Timer = nullTimer{}
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type nullTimer struct{}
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func (nullTimer) Record(time.Duration) {}
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