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Matteo Scandoloa4285862020-12-01 18:10:10 -08001// Copyright (c) 2017 Uber Technologies, Inc.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7// http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15package metrics
16
17import (
18 "time"
19)
20
21// Timer accumulates observations about how long some operation took,
22// and also maintains a historgam of percentiles.
23type Timer interface {
24 // Records the time passed in.
25 Record(time.Duration)
26}
27
28// NullTimer timer that does nothing
29var NullTimer Timer = nullTimer{}
30
31type nullTimer struct{}
32
33func (nullTimer) Record(time.Duration) {}