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/*
* Licensed to Elasticsearch 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 org.elasticsearch.common.util.concurrent.FutureUtils;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.LongAdder;
/**
* A meter metric which measures mean throughput and one-, five-, and
* fifteen-minute exponentially-weighted moving average throughputs.
*
* <p>
* taken from codahale metric module, replaced with LongAdder
*
* @see <a href="http://en.wikipedia.org/wiki/Moving_average#Exponential_moving_average">EMA</a>
*/
public class MeterMetric implements Metric {
private static final long INTERVAL = 5; // seconds
private final EWMA m1Rate = EWMA.oneMinuteEWMA();
private final EWMA m5Rate = EWMA.fiveMinuteEWMA();
private final EWMA m15Rate = EWMA.fifteenMinuteEWMA();
private final LongAdder count = new LongAdder();
private final long startTime = System.nanoTime();
private final TimeUnit rateUnit;
private final ScheduledFuture<?> future;
public MeterMetric(ScheduledExecutorService tickThread, TimeUnit rateUnit) {
this.rateUnit = rateUnit;
this.future = tickThread.scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
tick();
}
}, INTERVAL, INTERVAL, TimeUnit.SECONDS);
}
public TimeUnit rateUnit() {
return rateUnit;
}
/**
* Updates the moving averages.
*/
void tick() {
m1Rate.tick();
m5Rate.tick();
m15Rate.tick();
}
/**
* Mark the occurrence of an event.
*/
public void mark() {
mark(1);
}
/**
* Mark the occurrence of a given number of events.
*
* @param n the number of events
*/
public void mark(long n) {
count.add(n);
m1Rate.update(n);
m5Rate.update(n);
m15Rate.update(n);
}
public long count() {
return count.sum();
}
public double fifteenMinuteRate() {
return m15Rate.rate(rateUnit);
}
public double fiveMinuteRate() {
return m5Rate.rate(rateUnit);
}
public double meanRate() {
long count = count();
if (count == 0) {
return 0.0;
} else {
final long elapsed = (System.nanoTime() - startTime);
return convertNsRate(count / (double) elapsed);
}
}
public double oneMinuteRate() {
return m1Rate.rate(rateUnit);
}
private double convertNsRate(double ratePerNs) {
return ratePerNs * (double) rateUnit.toNanos(1);
}
public void stop() { FutureUtils.cancel(future);}
}
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