| // 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 |
| |
| // Gauge returns instantaneous measurements of something as an int64 value |
| type Gauge interface { |
| // Update the gauge to the value passed in. |
| Update(int64) |
| } |
| |
| // NullGauge gauge that does nothing |
| var NullGauge Gauge = nullGauge{} |
| |
| type nullGauge struct{} |
| |
| func (nullGauge) Update(int64) {} |