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/*
 * Licensed to ElasticSearch and Shay Banon under one
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 * 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,
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package org.elasticsearch.common.metrics;

import jsr166e.LongAdder;

import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;

/**
 * A meter metric which measures mean throughput and one-, five-, and
 * fifteen-minute exponentially-weighted moving average throughputs.
 *
 * @see EMA
 *      

* taken from codahale metric module, replaced with LongAdder */ 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() { future.cancel(false); } }





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