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• ResourceMethodStatistics.java

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org.glassfish.jersey.server.monitoring.ResourceMethodStatistics Maven / Gradle / Ivy

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2013 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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 * elects to include this software in this distribution under the [CDDL or GPL
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 * either the CDDL, the GPL Version 2 or to extend the choice of license to
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 */

package org.glassfish.jersey.server.monitoring;

import org.glassfish.jersey.server.model.ResourceMethod;

/**
 * Monitoring statistics an of an execution of the resource method. The {@link #snapshot()}
 * method returns an immutable snapshot with consistent data. The principles of using statistics
 * is similar to principles of using {@link MonitoringStatistics}.
 * 

 * Statistics contain two {@link ExecutionStatistics} where {@link #getMethodStatistics()} contains
 * statistics for execution of the code of resource method and {@link #getRequestStatistics()} contains
 * statistics for complete processing of requests that were matched to the resource method. This implies that
 * {@link #getRequestStatistics()} will tend to contain higher time measurements as they measure total request
 * processing time and not only execution of the resource method.
 * 

 * Statistics retrieved from Jersey runtime might be mutable and thanks to it might provide inconsistent data
 * as not all statistics are updated in the same time. To retrieve the immutable and consistent
 * statistics data the method {@link #snapshot()} should be used.
 *
 * @author Miroslav Fuksa (miroslav.fuksa at oracle.com)
 * @see MonitoringStatistics See monitoring statistics for more details.
 */
public interface ResourceMethodStatistics {

    /**
     * Get {@link ExecutionStatistics execution statistics} that contain measurements of times only for
     * execution of resource method. Durations average time, minimum time and maximum time
     * measure only time of execution of resource method code. It does not involve other request processing
     * phases.
     *
     * @return Execution statistics of one resource method.
     */
    public ExecutionStatistics getMethodStatistics();


    /**
     * Get {@link ExecutionStatistics execution statistics} that contain measurements of times for
     * whole processing from time when request comes into the Jersey application until the response
     * is written to the underlying IO container. The statistics involves only requests that were matched
     * to resource method defined by {@link #getResourceMethod()}.
     *
     * @return Execution statistics of entire request processing for one resource method.
     */
    public ExecutionStatistics getRequestStatistics();

    /**
     * Get a {@link ResourceMethod resource method} for which this {@link ResourceMethodStatistics} are calculated.
     *
     * @return Resource method.
     */
    public ResourceMethod getResourceMethod();

    /**
     * Get the immutable and consistent snapshot of the monitoring statistics. Working with snapshots might
     * have negative performance impact as snapshot must be created but ensures consistency of data over time.
     * However, the usage of snapshot is encouraged to avoid working with inconsistent data. Not all statistics
     * must be updated in the same time on mutable version of statistics.
     *
     * @return Snapshot of resource method statistics.
     */
    public ResourceMethodStatistics snapshot();
}