com.sun.jersey.api.client.async.FutureListener Maven / Gradle / Ivy

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2010-2011 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 com.sun.jersey.api.client.async;

import java.util.concurrent.CancellationException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;

/**
 * A future listener to receive an event when a Future has reached the
 * completed termination state of normal termination, an exception
 * or cancellation.
 * 
 * @param  the type held by the future.
 * @author [email protected]
 */
public interface FutureListener {

    /**
     * Invoked when a Future has reached the completed termination state.
     * 
     * The catching of a {@link ExecutionException} when
     * Future.get is invoked may be utilized to determine if the
     * future terminated with an exception. The exception can be obtained
     * by invoking {@link ExecutionException#getCause() }.
     * 
     * The catching of a {@link CancellationException} when 
     * Future.get is invoked may be utilized to determine if the
     * future terminated with a cancellation.
     *
     * @param f the completed Future. Invocation of {@link Future#isDone() }
     *        will return true. Since the future is complete invocation of
     *        {@link Future#get() } and {@link Future#get(long, java.util.concurrent.TimeUnit) }
     *        will not result in the throwing of an {@link InterruptedException}.
     * @throws InterruptedException this exception is declared so that the
     *         developer does not need to catch it when invoking
     *         Future.get.
     */
    void onComplete(Future f) throws InterruptedException;
}