/
ExecutionStatisticsImpl.java
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/
ExecutionStatisticsImpl.java
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/*
* Copyright (c) 2013, 2019 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package org.glassfish.jersey.server.internal.monitoring;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import org.glassfish.jersey.server.internal.monitoring.core.UniformTimeReservoir;
import org.glassfish.jersey.server.monitoring.ExecutionStatistics;
import org.glassfish.jersey.server.monitoring.TimeWindowStatistics;
/**
* Immutable Execution statistics.
*
* @author Miroslav Fuksa
* @author Stepan Vavra
*/
final class ExecutionStatisticsImpl implements ExecutionStatistics {
/**
* Empty execution statistics instance.
*/
static final ExecutionStatistics EMPTY = new Builder().build();
/**
* Builder of execution statistics.
* <p/>
* Must be thread-safe.
*/
static class Builder {
private volatile long lastStartTime;
private final Map<Long, TimeWindowStatisticsImpl.Builder> intervalStatistics;
private final Collection<TimeWindowStatisticsImpl.Builder<Long>> updatableIntervalStatistics;
/**
* Create a new builder.
*/
@SuppressWarnings("MagicNumber")
public Builder() {
final long nowMillis = System.currentTimeMillis();
final AggregatingTrimmer trimmer = new AggregatingTrimmer(nowMillis, TimeUnit.MILLISECONDS, 1, TimeUnit.SECONDS);
final TimeWindowStatisticsImpl.Builder<Long> oneSecondIntervalWindowBuilder =
new TimeWindowStatisticsImpl.Builder<>(
new SlidingWindowTimeReservoir(1, TimeUnit.SECONDS, nowMillis, TimeUnit.MILLISECONDS, trimmer));
final TimeWindowStatisticsImpl.Builder<Long> infiniteIntervalWindowBuilder =
new TimeWindowStatisticsImpl.Builder<>(new UniformTimeReservoir(nowMillis, TimeUnit.MILLISECONDS));
this.updatableIntervalStatistics =
Arrays.asList(infiniteIntervalWindowBuilder, oneSecondIntervalWindowBuilder);
// create unmodifiable map to ensure that an iteration in the build() won't have multi-threading issues
final HashMap<Long, TimeWindowStatisticsImpl.Builder> tmpIntervalStatistics = new HashMap<>(6);
// Add approximate infinite time window builder
tmpIntervalStatistics.put(0L, infiniteIntervalWindowBuilder);
// Add precise 1 second time window builder
tmpIntervalStatistics.put(TimeUnit.SECONDS.toMillis(1), oneSecondIntervalWindowBuilder);
// Add aggregated 15 seconds time window builder
addAggregatedInterval(tmpIntervalStatistics, nowMillis, 15, TimeUnit.SECONDS, trimmer);
// Add aggregated 1 minute time window builder
addAggregatedInterval(tmpIntervalStatistics, nowMillis, 1, TimeUnit.MINUTES, trimmer);
// Add aggregated 15 minutes time window builder
addAggregatedInterval(tmpIntervalStatistics, nowMillis, 15, TimeUnit.MINUTES, trimmer);
// Add aggregated 1 hour time window builder
addAggregatedInterval(tmpIntervalStatistics, nowMillis, 1, TimeUnit.HOURS, trimmer);
this.intervalStatistics = Collections.unmodifiableMap(tmpIntervalStatistics);
}
private static void addAggregatedInterval(
final Map<Long, TimeWindowStatisticsImpl.Builder> intervalStatisticsMap,
final long nowMillis,
final long interval,
final TimeUnit timeUnit,
final AggregatingTrimmer notifier) {
final long intervalInMillis = timeUnit.toMillis(interval);
intervalStatisticsMap.put(intervalInMillis, new TimeWindowStatisticsImpl.Builder<>(
new AggregatedSlidingWindowTimeReservoir(intervalInMillis, TimeUnit.MILLISECONDS, nowMillis,
TimeUnit.MILLISECONDS, notifier)));
}
/**
* Add execution of a target.
*
* @param startTime Start time of an execution event (in Unix timestamp format).
* @param duration Duration of an execution event in milliseconds.
*/
void addExecution(final long startTime, final long duration) {
for (final TimeWindowStatisticsImpl.Builder<Long> statBuilder : updatableIntervalStatistics) {
statBuilder.addRequest(startTime, duration);
}
this.lastStartTime = startTime;
}
/**
* Build a new instance of execution statistics.
*
* @return new instance of execution statistics.
*/
public ExecutionStatisticsImpl build() {
final Map<Long, TimeWindowStatistics> newIntervalStatistics = new HashMap<>();
for (final Map.Entry<Long, TimeWindowStatisticsImpl.Builder> builderEntry : intervalStatistics.entrySet()) {
newIntervalStatistics.put(builderEntry.getKey(), builderEntry.getValue().build());
}
// cache when request rate is 0
return new ExecutionStatisticsImpl(lastStartTime, newIntervalStatistics);
}
}
private final long lastStartTime;
private final Map<Long, TimeWindowStatistics> timeWindowStatistics;
@Override
public Date getLastStartTime() {
return new Date(lastStartTime);
}
@Override
public Map<Long, TimeWindowStatistics> getTimeWindowStatistics() {
return timeWindowStatistics;
}
@Override
public ExecutionStatistics snapshot() {
// this object is immutable (TimeWindowStatistics are immutable as well)
return this;
}
private ExecutionStatisticsImpl(final long lastStartTime, final Map<Long, TimeWindowStatistics> timeWindowStatistics) {
this.lastStartTime = lastStartTime;
this.timeWindowStatistics = Collections.unmodifiableMap(timeWindowStatistics);
}
}