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