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• ExecutionStatisticsImpl.java

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org.glassfish.jersey.server.internal.monitoring.ExecutionStatisticsImpl Maven / Gradle / Ivy

/*
 * 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:
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 * 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
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 * 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
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 */

package org.glassfish.jersey.server.internal.monitoring;

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.monitoring.ExecutionStatistics;
import org.glassfish.jersey.server.monitoring.TimeWindowStatistics;

import jersey.repackaged.com.google.common.collect.ImmutableList;
import jersey.repackaged.com.google.common.collect.Maps;

/**
 * Immutable Execution statistics.
 *
 * @author Miroslav Fuksa
 * @author Stepan Vavra (stepan.vavra at oracle.com)
 */
final class ExecutionStatisticsImpl implements ExecutionStatistics {

    /**
     * Empty execution statistics instance.
     */
    static final ExecutionStatistics EMPTY = new Builder().build();

    /**
     * Builder of execution statistics.
     * 

     * Must be thread-safe.
     */
    static class Builder {

        private volatile long lastStartTime;
        private final Map intervalStatistics;
        private final Collection> 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 oneSecondIntervalWindowBuilder =
                    new TimeWindowStatisticsImpl.Builder<>(
                            new SlidingWindowTimeReservoir(1, TimeUnit.SECONDS, nowMillis, TimeUnit.MILLISECONDS, trimmer));
            final TimeWindowStatisticsImpl.Builder infiniteIntervalWindowBuilder =
                    new TimeWindowStatisticsImpl.Builder<>(new UniformTimeReservoir(nowMillis, TimeUnit.MILLISECONDS));

            this.updatableIntervalStatistics = ImmutableList.of(infiniteIntervalWindowBuilder, oneSecondIntervalWindowBuilder);

            // create unmodifiable map to ensure that an iteration in the build() won't have multi-threading issues
            final HashMap 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 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 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 newIntervalStatistics = Maps.newHashMap();
            for (final Map.Entry 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 timeWindowStatistics;

    @Override
    public Date getLastStartTime() {
        return new Date(lastStartTime);
    }

    @Override
    public Map 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 timeWindowStatistics) {
        this.lastStartTime = lastStartTime;
        this.timeWindowStatistics = Collections.unmodifiableMap(timeWindowStatistics);
    }

}