org.elasticsearch.common.metrics.MeanMetric Maven / Gradle / Ivy
/*
* Licensed to ElasticSearch and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. ElasticSearch licenses this
* file to you 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 org.elasticsearch.common.metrics;
import jsr166e.LongAdder;
/**
*/
public class MeanMetric implements Metric {
private final LongAdder counter = new LongAdder();
private final LongAdder sum = new LongAdder();
public void inc(long n) {
counter.increment();
sum.add(n);
}
public void dec(long n) {
counter.decrement();
sum.add(-n);
}
public long count() {
return counter.sum();
}
public long sum() {
return sum.sum();
}
public double mean() {
long count = count();
if (count > 0) {
return sum.sum() / (double) count;
}
return 0.0;
}
public void clear() {
counter.reset();
sum.reset();
}
}