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Rohan Agrawalc32d9932020-06-15 11:01:47 +00001// 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
15package metrics
16
17// Histogram that keeps track of a distribution of values.
18type Histogram interface {
19 // Records the value passed in.
20 Record(float64)
21}
22
23// NullHistogram that does nothing
24var NullHistogram Histogram = nullHistogram{}
25
26type nullHistogram struct{}
27
28func (nullHistogram) Record(float64) {}