org.glassfish.jersey.server.internal.monitoring.TimeWindowStatisticsImpl Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jersey-min Show documentation
Show all versions of jersey-min Show documentation
jersey-min is a rebundled (minmal) verison of Jersey as one OSGi bundle.
The newest version!
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2013-2015 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* http://glassfish.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package org.glassfish.jersey.server.internal.monitoring;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.TimeUnit;
import org.glassfish.jersey.server.monitoring.TimeWindowStatistics;
/**
* Immutable {@link TimeWindowStatistics Time window statistics} that uses backing {@link SlidingWindowTimeReservoir} for its
* {@code Builder} implementation.
*
* @author Miroslav Fuksa
* @author Stepan Vavra (stepan.vavra at oracle.com)
*/
final class TimeWindowStatisticsImpl implements TimeWindowStatistics {
/**
* Builder of time window statistics.
*/
static class Builder {
/**
* Total interval for which these statistics are calculated (eg. last 15 seconds, last one minute) converted to ms
*/
private final long interval;
private final TimeReservoir timeReservoir;
/**
* Create new time window statistics builder instance.
*
* @param timeReservoir statistically representative reservoir of long values data stream in time.
*/
Builder(TimeReservoir timeReservoir) {
interval = timeReservoir.interval(TimeUnit.MILLISECONDS);
this.timeReservoir = timeReservoir;
}
/**
* Add request execution.
*
* @param requestTime Time of execution.
* @param duration Duration of request processing.
*/
void addRequest(final long requestTime, final V duration) {
timeReservoir.update(duration, requestTime, TimeUnit.MILLISECONDS);
}
/**
* Build the time window statistics instance.
*
* @return New instance of statistics.
*/
TimeWindowStatisticsImpl build() {
return build(System.currentTimeMillis());
}
/**
* Build the time window statistics instance.
*
* @param currentTime Current time as a reference to which the statistics should be built.
* @return New instance of statistics.
*/
TimeWindowStatisticsImpl build(final long currentTime) {
final UniformTimeSnapshot durationReservoirSnapshot = timeReservoir
.getSnapshot(currentTime, TimeUnit.MILLISECONDS);
// if nothing was collected, return a single empty stat instance
if (durationReservoirSnapshot.size() == 0) {
return getOrCreateEmptyStats(interval);
}
return new TimeWindowStatisticsImpl(interval, durationReservoirSnapshot);
}
private TimeWindowStatisticsImpl getOrCreateEmptyStats(final long interval) {
if (!EMPTY.containsKey(interval)) {
EMPTY.putIfAbsent(interval, new TimeWindowStatisticsImpl(interval, 0, -1, -1, -1, 0));
}
return EMPTY.get(interval);
}
public long getInterval() {
return interval;
}
}
private static final ConcurrentHashMap EMPTY = new ConcurrentHashMap<>(6);
static {
EMPTY.putIfAbsent(0L, new TimeWindowStatisticsImpl(0, 0, 0, 0, 0, 0));
}
private final long interval;
private final long minimumDuration;
private final long maximumDuration;
private final long averageDuration;
private final long totalCount;
private final double requestsPerSecond;
private TimeWindowStatisticsImpl(final long interval, final double requestsPerSecond, final long minimumDuration,
final long maximumDuration, final long averageDuration, final long totalCount) {
this.interval = interval;
this.requestsPerSecond = requestsPerSecond;
this.minimumDuration = minimumDuration;
this.maximumDuration = maximumDuration;
this.averageDuration = averageDuration;
this.totalCount = totalCount;
}
private TimeWindowStatisticsImpl(final long interval, final UniformTimeSnapshot snapshot) {
this(interval, snapshot.getRate(TimeUnit.SECONDS), snapshot.getMin(), snapshot.getMax(), (long) snapshot.getMean(),
snapshot.size());
}
@Override
public long getTimeWindow() {
return interval;
}
@Override
public double getRequestsPerSecond() {
return requestsPerSecond;
}
@Override
public long getMinimumDuration() {
return minimumDuration;
}
@Override
public long getMaximumDuration() {
return maximumDuration;
}
@Override
public long getRequestCount() {
return totalCount;
}
@Override
public TimeWindowStatistics snapshot() {
// TimeWindowStatisticsImpl is immutable; the Builder is mutable
return this;
}
@Override
public long getAverageDuration() {
return averageDuration;
}
}