| Girish Gowdra | 631ef3d | 2020-06-15 10:45:52 -0700 | [diff] [blame^] | 1 | // Copyright (c) 2018 The Jaeger Authors |
| 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 | // Histogram that keeps track of a distribution of values. |
| 18 | type Histogram interface { |
| 19 | // Records the value passed in. |
| 20 | Record(float64) |
| 21 | } |
| 22 | |
| 23 | // NullHistogram that does nothing |
| 24 | var NullHistogram Histogram = nullHistogram{} |
| 25 | |
| 26 | type nullHistogram struct{} |
| 27 | |
| 28 | func (nullHistogram) Record(float64) {} |