| Matteo Scandolo | a428586 | 2020-12-01 18:10:10 -0800 | [diff] [blame] | 1 | // 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 | |
| 15 | package metrics |
| 16 | |
| 17 | import ( |
| 18 | "time" |
| 19 | ) |
| 20 | |
| 21 | // Timer accumulates observations about how long some operation took, |
| 22 | // and also maintains a historgam of percentiles. |
| 23 | type Timer interface { |
| 24 | // Records the time passed in. |
| 25 | Record(time.Duration) |
| 26 | } |
| 27 | |
| 28 | // NullTimer timer that does nothing |
| 29 | var NullTimer Timer = nullTimer{} |
| 30 | |
| 31 | type nullTimer struct{} |
| 32 | |
| 33 | func (nullTimer) Record(time.Duration) {} |