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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
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 *
 * Modifications:
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 * 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
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 */
package org.glassfish.jersey.servlet.async;

import java.util.concurrent.atomic.AtomicReference;

import javax.servlet.AsyncContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.glassfish.jersey.servlet.spi.AsyncContextDelegate;
import org.glassfish.jersey.servlet.spi.AsyncContextDelegateProvider;


/**
 * Servlet 3.x container response writer async extension and related extension factory implementation.
 *
 * @author Jakub Podlesak (jakub.podlesak at oracle.com)
 * @author Marek Potociar (marek.potociar at oracle.com)
 */
public class AsyncContextDelegateProviderImpl implements AsyncContextDelegateProvider {

    @Override
    public final AsyncContextDelegate createDelegate(final HttpServletRequest request, final HttpServletResponse response) {
        return new ExtensionImpl(request, response);
    }

    private static final class ExtensionImpl implements AsyncContextDelegate {

        private static final int NEVER_TIMEOUT_VALUE = -1;

        private final HttpServletRequest request;
        private final HttpServletResponse response;
        private final AtomicReference asyncContextRef;

        /**
         * Create a Servlet 3.x {@link AsyncContextDelegate} with given {@code request} and {@code response}.
         *
         * @param request request to create {@link AsyncContext} for.
         * @param response response to create {@link AsyncContext} for.
         */
        private ExtensionImpl(final HttpServletRequest request, final HttpServletResponse response) {
            this.request = request;
            this.response = response;
            this.asyncContextRef = new AtomicReference();
        }

        @Override
        public void suspend() throws IllegalStateException {
            final AsyncContext asyncContext = request.startAsync(request, response);

            // Tell underlying asyncContext to never time out.
            asyncContext.setTimeout(NEVER_TIMEOUT_VALUE);

            asyncContextRef.set(asyncContext);
        }

        @Override
        public void complete() {
            final AsyncContext asyncContext = asyncContextRef.getAndSet(null);
            if (asyncContext != null) {
                asyncContext.complete();
            }
        }
    }
}