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• RequestExecutorProvider.java

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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2012-2013 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.spi;

import java.util.concurrent.ExecutorService;

/**
 * Pluggable provider of {@link ExecutorService executor service} instance used to run
 * different parts of Jersey request and response processing code.
 * 

 * During Jersey runtime initialization, Jersey invokes the registered executor provider
 * to get the {@link #getRequestingExecutor() requesting executor} that will be used
 * to run the request pre-processing and request-to-response transformation code.
 * 
 * 

 * The custom provider implementing this interface should be registered in the standard way on the server.
 * The client must be created with configuration containing the provider, later registrations will be ignored.
 * 
 *
 * @author Marek Potociar (marek.potociar at oracle.com)
 * @author Miroslav Fuksa (miroslav.fuksa at oracle.com)
 */
@Contract
public interface RequestExecutorProvider {
    /**
     * Get request processing executor.
     *
     * This method is called only once at Jersey initialization, before the
     * first request is processed.
     *
     * @return request processing executor. Must not return {@code null}.
     */
    public ExecutorService getRequestingExecutor();

    /**
     * Release the executor previously retrieved via {@link #getRequestingExecutor} call.
     *
     * This method is called when the Jersey runtime does not need the executor anymore.
     * After this method has been called, the executor will not be used by the Jersey runtime
     * anymore.
     * 

     * The decision how the executor is released is left upon the provider implementation.
     * In most typical scenarios, the executor may be simply shutdown. However in cases when
     * the provider is implemented to re-use same executors across multiple components or Jersey
     * runtimes, the executor release logic may require more sophisticated implementation.
     * 
     *
     * @param executor executor instance to be released.
     * @since 2.5
     */
    public void releaseRequestingExecutor(ExecutorService executor);
}