Jetty example source code file (HandlerCollection.java)

This example Jetty source code file (HandlerCollection.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Jetty tags/keywords

abstracthandlercontainer, exception, handler, handler, handlercollection, handlercollection, http, httpservletresponse, io, ioexception, multiexception, multiexception, object, request, response, server, servlet, servletexception, servletexception

The Jetty HandlerCollection.java source code

//========================================================================
//$Id: HandlerCollection.java,v 1.5 2005/11/11 22:55:39 gregwilkins Exp $
//Copyright 2004-2005 Mort Bay Consulting Pty. Ltd.
//------------------------------------------------------------------------
//Licensed under the Apache License, Version 2.0 (the "License");
//you may not use this file except in compliance with the License.
//You may obtain a copy of the License at 
//http://www.apache.org/licenses/LICENSE-2.0
//Unless required by applicable law or agreed to in writing, software
//distributed under the License is distributed on an "AS IS" BASIS,
//WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//See the License for the specific language governing permissions and
//limitations under the License.
//========================================================================

package org.mortbay.jetty.handler;

import java.io.IOException;

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

import org.mortbay.jetty.EofException;
import org.mortbay.jetty.Handler;
import org.mortbay.jetty.Server;
import org.mortbay.util.LazyList;
import org.mortbay.util.MultiException;

/* ------------------------------------------------------------ */
/** A collection of handlers.  
 * For each request, all handler are called, regardless of 
 * the response status or exceptions.
 *  
 * @author gregw
 * @org.apache.xbean.XBean
 */
public class HandlerCollection extends AbstractHandlerContainer
{
    private Handler[] _handlers;

    /* ------------------------------------------------------------ */
    public HandlerCollection()
    {
        super();
    }

    /* ------------------------------------------------------------ */
    /**
     * @return Returns the handlers.
     */
    public Handler[] getHandlers()
    {
        return _handlers;
    }
    
    /* ------------------------------------------------------------ */
    /**
     * 
     * @param handlers The handlers to set.
     */
    public void setHandlers(Handler[] handlers)
    {
        Handler [] old_handlers = _handlers==null?null:(Handler[])_handlers.clone();
        
        if (getServer()!=null)
            getServer().getContainer().update(this, old_handlers, handlers, "handler");
        
        Server server = getServer();
        MultiException mex = new MultiException();
        for (int i=0;handlers!=null && i<handlers.length;i++)
        {
            if (handlers[i].getServer()!=server)
                handlers[i].setServer(server);
        }

        // quasi atomic.... so don't go doing this under load on a SMP system.
        _handlers = handlers;

        for (int i=0;old_handlers!=null && i<old_handlers.length;i++)
        {
            if (old_handlers[i]!=null)
            {
                try
                {
                    if (old_handlers[i].isStarted())
                        old_handlers[i].stop();
                }
                catch (Throwable e)
                {
                    mex.add(e);
                }
            }
        }
                
        mex.ifExceptionThrowRuntime();
    }

    /* ------------------------------------------------------------ */
    /* 
     * @see org.mortbay.jetty.EventHandler#handle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     */
    public void handle(String target, HttpServletRequest request, HttpServletResponse response, int dispatch) 
        throws IOException, ServletException
    {
        if (_handlers!=null && isStarted())
        {
            MultiException mex=null;
            
            for (int i=0;i<_handlers.length;i++)
            {
                try
                {
                    _handlers[i].handle(target,request, response, dispatch);
                }
                catch(IOException e)
                {
                    throw e;
                }
                catch(RuntimeException e)
                {
                    throw e;
                }
                catch(Exception e)
                {
                    if (mex==null)
                        mex=new MultiException();
                    mex.add(e);
                }
            }
            if (mex!=null)
            {
                if (mex.size()==1)
                    throw new ServletException(mex.getThrowable(0));
                else
                    throw new ServletException(mex);
            }
            
        }    
    }

    /* ------------------------------------------------------------ */
    /* 
     * @see org.mortbay.jetty.handler.AbstractHandler#doStart()
     */
    protected void doStart() throws Exception
    {
        MultiException mex=new MultiException();
        if (_handlers!=null)
        {
            for (int i=0;i<_handlers.length;i++)
                try{_handlers[i].start();}catch(Throwable e){mex.add(e);}
        }
        super.doStart();
        mex.ifExceptionThrow();
    }

    /* ------------------------------------------------------------ */
    /* 
     * @see org.mortbay.jetty.handler.AbstractHandler#doStop()
     */
    protected void doStop() throws Exception
    {
        MultiException mex=new MultiException();
        try { super.doStop(); } catch(Throwable e){mex.add(e);}
        if (_handlers!=null)
        {
            for (int i=_handlers.length;i-->0;)
                try{_handlers[i].stop();}catch(Throwable e){mex.add(e);}
        }
        mex.ifExceptionThrow();
    }
    
    /* ------------------------------------------------------------ */
    public void setServer(Server server)
    {
        Server old_server=getServer();
        
        super.setServer(server);

        Handler[] h=getHandlers();
        for (int i=0;h!=null && i<h.length;i++)
            h[i].setServer(server);
        
        if (server!=null && server!=old_server)
            server.getContainer().update(this, null,_handlers, "handler");
        
    }

    /* ------------------------------------------------------------ */
    /* Add a handler.
     * This implementation adds the passed handler to the end of the existing collection of handlers. 
     * @see org.mortbay.jetty.HandlerContainer#addHandler(org.mortbay.jetty.Handler)
     */
    public void addHandler(Handler handler)
    {
        setHandlers((Handler[])LazyList.addToArray(getHandlers(), handler, Handler.class));
    }
    
    /* ------------------------------------------------------------ */
    public void removeHandler(Handler handler)
    {
        Handler[] handlers = getHandlers();
        
        if (handlers!=null && handlers.length>0 )
            setHandlers((Handler[])LazyList.removeFromArray(handlers, handler));
    }

    /* ------------------------------------------------------------ */
    protected Object expandChildren(Object list, Class byClass)
    {
        Handler[] handlers = getHandlers();
        for (int i=0;handlers!=null && i<handlers.length;i++)
            list=expandHandler(handlers[i], list, byClass);
        return list;
    }


}