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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 1997-2008 Sun Microsystems, Inc. All rights reserved.
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 * 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
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 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
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 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
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 * Copyright 2004 The Apache Software Foundation
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 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
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package org.jboss.servlet.http;

import java.io.IOException;

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

/**
 * The HttpEvent interface.
 *
 * @author Remy Maucherat
 */
public interface HttpEvent {

    public enum EventType {BEGIN, READ, END, ERROR, TIMEOUT}
    
        
    /**
     * Returns the HttpServletRequest.
     * 
     * @return HttpServletRequest
     */
    public HttpServletRequest getHttpServletRequest();
    
    /**
     * Returns the HttpServletResponse.
     * 
     * @return HttpServletResponse
     */
    public HttpServletResponse getHttpServletResponse();
    
    /**
     * Returns the event type.
     * 
     * @return EventType
     */
    public EventType getType();
    
    
    /**
     * Ends the Comet session. This signals to the container that 
     * the container wants to end the comet session. This will send back to the
     * client a notice that the server has no more data to send as part of this
     * request. The servlet should perform any needed cleanup as if it had recieved
     * an END or ERROR event. 
     * 
     * @throws IOException if an IO exception occurs
     */
    public void close() throws IOException;
    
    /**
     * Sets the timeout for this Comet connection. Please NOTE, that the implementation 
     * of a per connection timeout is OPTIONAL and MAY NOT be implemented.

     * This method sets the timeout in milliseconds of idle time on the connection.
     * The timeout is reset every time data is received from the connection or data is flushed
     * using response.flushBuffer(). If a timeout occurs, the 
     * error(HttpServletRequest, HttpServletResponse) method is invoked. The 
     * web application SHOULD NOT attempt to reuse the request and response objects after a timeout
     * as the error(HttpServletRequest, HttpServletResponse) method indicates.

     * This method should not be called asynchronously, as that will have no effect.
     * 
     * @param timeout The timeout in milliseconds for this connection, must be a positive value, larger than 0
     * @throws IOException An IOException may be thrown to indicate an IO error, 
     *         or that the EOF has been reached on the connection
     * @throws ServletException An exception has occurred, as specified by the root
     *         cause
     * @throws UnsupportedOperationException if per connection timeout is not supported, either at all or at this phase
     *         of the invocation.
     */
    public void setTimeout(int timeout)
        throws IOException, ServletException, UnsupportedOperationException;

}