com.smoketurner.snowizard.grpc.stats.Recorder Maven / Gradle / Ivy
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/*
* Copyright © 2013, General Electric Corporation
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.smoketurner.snowizard.grpc.stats;
import java.util.concurrent.TimeUnit;
import org.HdrHistogram.Histogram;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class Recorder {
private static final Logger LOGGER = LoggerFactory.getLogger(Recorder.class);
private final IntervalAdder count;
private final IntervalAdder responseTime;
private final org.HdrHistogram.Recorder latency;
private final long goalLatency;
private volatile Histogram histogram;
/**
* Constructor
*
* @param minLatency
* @param maxLatency
* @param goalLatency
* @param latencyUnit
*/
public Recorder(long minLatency, long maxLatency, long goalLatency, TimeUnit latencyUnit) {
this.goalLatency = latencyUnit.toMicros(goalLatency);
this.count = new IntervalAdder();
this.responseTime = new IntervalAdder();
this.latency =
new org.HdrHistogram.Recorder(
latencyUnit.toMicros(minLatency), latencyUnit.toMicros(maxLatency), 1);
this.histogram = latency.getIntervalHistogram(); // preload reporting
// histogram
}
public void record(long startNanoTime) {
final long duration = TimeUnit.NANOSECONDS.toMicros(System.nanoTime() - startNanoTime);
count.add(1);
responseTime.add(duration);
try {
latency.recordValue(duration);
} catch (ArrayIndexOutOfBoundsException ignored) {
LOGGER.warn("Very slow value: {}us", duration);
}
}
public Snapshot interval() {
final IntervalCount requestCount = count.interval();
final IntervalCount responseTimeCount = responseTime.interval();
final Histogram h = latency.getIntervalHistogram(histogram);
final long c = requestCount.getCount();
final double x = requestCount.getRate();
final long satisfied = h.getCountBetweenValues(0, goalLatency);
final long tolerating = h.getCountBetweenValues(goalLatency, goalLatency * 4);
final double p50 = h.getValueAtPercentile(50) * 1e-6;
final double p90 = h.getValueAtPercentile(90) * 1e-6;
final double p99 = h.getValueAtPercentile(99) * 1e-6;
final double p999 = h.getValueAtPercentile(99.9) * 1e-6;
this.histogram = h;
final double r, n, apdex;
if (c == 0) {
r = n = apdex = 0;
} else {
r = responseTimeCount.getRate() / c * 1e-6;
n = x * r;
apdex = Math.min(1.0, (satisfied + (tolerating / 2.0)) / c);
}
return new Snapshot(c, x, n, r, p50, p90, p99, p999, apdex);
}
}