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- // Copyright (c) 2018 The Jaeger Authors
- //
- // 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
- // Histogram that keeps track of a distribution of values.
- type Histogram interface {
- // Records the value passed in.
- Record(float64)
- }
- // NullHistogram that does nothing
- var NullHistogram Histogram = nullHistogram{}
- type nullHistogram struct{}
- func (nullHistogram) Record(float64) {}
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