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//
//  ========================================================================
//  Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package org.eclipse.jetty.server.handler;

import java.io.IOException;

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

import org.eclipse.jetty.io.EndPoint;
import org.eclipse.jetty.server.AbstractHttpConnection;
import org.eclipse.jetty.server.Request;

/**
 * Handler to adjust the idle timeout of requests while dispatched.
 * 
 * Can be applied in jetty.xml with
 * 
 *   <Get id='handler' name='Handler'/>
 *   <Set name='Handler'>
 *     <New id='idleTimeoutHandler' class='org.eclipse.jetty.server.handler.IdleTimeoutHandler'>
 *       <Set name='Handler'><Ref id='handler'/></Set>
 *       <Set name='IdleTimeoutMs'>5000</Set>
 *     </New>
 *   </Set>
 * 
 */
public class IdleTimeoutHandler extends HandlerWrapper
{
    private int _idleTimeoutMs = 1000;
    private boolean _applyToAsync = false;
    
    
    public boolean isApplyToAsync()
    {
        return _applyToAsync;
    }

    /**
     * Should the adjusted idle time be maintained for asynchronous requests
     * @param applyToAsync true if alternate idle timeout is applied to asynchronous requests
     */
    public void setApplyToAsync(boolean applyToAsync)
    {
        _applyToAsync = applyToAsync;
    }

    public long getIdleTimeoutMs()
    {
        return _idleTimeoutMs;
    }

    /**
     * @param idleTimeoutMs The idle timeout in MS to apply while dispatched or async
     */
    public void setIdleTimeoutMs(int _idleTimeoutMs)
    {
        this._idleTimeoutMs = _idleTimeoutMs;
    }
    
   
    @Override
    public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
    {
        AbstractHttpConnection connection = AbstractHttpConnection.getCurrentConnection();
        final EndPoint endp = connection==null?null:connection.getEndPoint();
        
        final int idle_timeout;
        if (endp==null)
            idle_timeout=-1;
        else
        {
            idle_timeout=endp.getMaxIdleTime();
            endp.setMaxIdleTime(_idleTimeoutMs);
        }
        
        try
        {
            super.handle(target,baseRequest,request,response);
        }
        finally
        {
            if (endp!=null)
            {
                if (_applyToAsync && request.isAsyncStarted())
                {
                    request.getAsyncContext().addListener(new AsyncListener()
                    {
                        @Override
                        public void onTimeout(AsyncEvent event) throws IOException
                        {                            
                        }
                        
                        @Override
                        public void onStartAsync(AsyncEvent event) throws IOException
                        {
                        }
                        
                        @Override
                        public void onError(AsyncEvent event) throws IOException
                        {
                            endp.setMaxIdleTime(idle_timeout);
                        }
                        
                        @Override
                        public void onComplete(AsyncEvent event) throws IOException
                        {
                            endp.setMaxIdleTime(idle_timeout);
                        }
                    });
                }
                else 
                {
                    endp.setMaxIdleTime(idle_timeout);
                }
            }
        }
    }
}