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/*
 * 
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 2007-2008 Sun Microsystems, Inc. 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 https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/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 glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
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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
 * 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
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package org.atmosphere.cpr;

import org.atmosphere.cpr.AtmosphereServlet.AtmosphereConfig;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;


/**
 * A {@link AtmosphereResource} encapsulates the mechanism to {@link #suspend()},
 * {@link #resume()} and broadcast ({@link #getBroadcaster()}) messages among
 * suspended response. {@link AtmosphereResource} are passed at runtime to an
 * instance of {@link AtmosphereHandler}.
 * 
 * @author Jeanfrancois Arcand
 */
public interface AtmosphereResource {

    /**
     * Complete the {@link HttpServletResponse} and finish/commit it. If the
     * {@link HttpServletResponse} is in the process of being resumed, invoking
     * that method has no effect.
     */
    public void resume();
       
    /**
     * Suspend the {@link HttpServletResponse} indefinitely. 
     * Suspending a {@link HttpServletResponse} will
     * tell the underlying container to avoid recycling objects associated with
     * the current instance, and also to avoid commiting response.
     *
     * The Framework will output some HTML comments when suspending the response
     * in order to make sure all Browser works well with suspended response.
     *
     */
    public void suspend();

    /**
     * Suspend the {@link HttpServletResponse}. Suspending a {@link HttpServletResponse} will
     * tell the underlying container to avoid recycling objects associated with
     * the current instance, and also to avoid commiting response. Invoking 
     * this method when a request is being timed out, e.g. {@link AtmosphereResourceEvent#isResumedOnTimeout} return true,
     * has no effect.
     *
     * The Framework will output some HTML comments when suspending the response
     * in order to make sure all Browser works well with suspended response. By default,
     * the {@link HttpServletResponse#getWriter} will be used. You can change that
     * behavior by setting a request attribute named org.atmosphere.useStream to
     * so the framework will use {@link HttpServletResponse#getOutputStream()}
     *
     * @param timeout The maximum amount of time, in milliseconds, 
     * a {@link HttpServletResponse} can be suspended. When the timeout expires (because 
     * nothing has been written or because the {@link AtmosphereResource#resume()}
     * , the {@link HttpServletResponse} will be automatically
     * resumed and commited. Usage of any methods of a {@link HttpServletResponse} that
     * times out will throw an {@link IllegalStateException}.
     */   
    public void suspend(long timeout);

    /**
     * Suspend the {@link HttpServletResponse}. Suspending a {@link HttpServletResponse} will
     * tell the underlying container to avoid recycling objects associated with
     * the current instance, and also to avoid commiting response. Invoking
     * this method when a request is being timed out, e.g. {@link AtmosphereResourceEvent#isResumedOnTimeout} return true,
     * has no effect.
     *
     * The Framework will output some HTML comments when suspending the response
     * in order to make sure all Browser works well with suspended response. By default,
     * the {@link HttpServletResponse#getWriter} will be used. You can change that
     * behavior by setting a request attribute named org.atmosphere.useStream to
     * so the framework will use {@link HttpServletResponse#getOutputStream()}
     *
     * @param timeout The maximum amount of time, in milliseconds,
     * a {@link HttpServletResponse} can be suspended. When the timeout expires (because
     * nothing has been written or because the {@link AtmosphereResource#resume()}
     * , the {@link HttpServletResponse} will be automatically
     * resumed and commited. Usage of any methods of a {@link HttpServletResponse} that
     * times out will throw an {@link IllegalStateException}.
     * @param flushComment By default, Atmosphere will output some comments to make WebKit based
     *        browser working. Set it to false if you want to remove it.
     */
    public void suspend(long timeout, boolean flushComment);
          
    /**
     * Return the underlying  Request.
     * @return E the underlying Request.
     */
    public E getRequest();
    
    
    /**
     * Return the underlying  Response.
     * @return F the underlying Response.
     */
    public F getResponse();

    /**
     * Return the {@link AtmosphereConfig}
     * @return the {@link AtmosphereConfig}
     */
    public AtmosphereConfig getAtmosphereConfig();
    
    /**
     * Return the current {@link Broadcaster}
     */
    public Broadcaster getBroadcaster();
        
    /**
     * Set the current {@link Broadcaster}
     */
    public void setBroadcaster(Broadcaster broadcaster);

   
    /**
     * Set the {@link Serializer} to use when {@link AtmosphereResource#write}
     * execute the operation. By default, the {@link Serializer} is null.
     * @param s the {@link Serializer}
     */
    public void setSerializer(Serializer s);

    /**
     * Write the {@link Object} using the {@link OutputStream} by invoking
     * the current {@link Serializer}. If {@link Serializer} is null, the {@link Object}
     * will be directly written using the {
     * @param os {@link OutputStream}
     * @param o {@link Object}
     */
    public void write(OutputStream os, Object o) throws IOException;

    /**
     * Get the {@link Serializer} or null if not defined.
     * @return the {@link Serializer} or null if not defined.
     */
    public Serializer getSerializer();

}