//
// ========================================================================
// Copyright (c) 1995-2014 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 java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jetty.server.Handler;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.Server;
/* ------------------------------------------------------------ */
/**
* A <code>HandlerContainer</code> that allows a hot swap of a wrapped handler.
*
*/
public class HotSwapHandler extends AbstractHandlerContainer
{
private volatile Handler _handler;
/* ------------------------------------------------------------ */
/**
*
*/
public HotSwapHandler()
{
}
/* ------------------------------------------------------------ */
/**
* @return Returns the handlers.
*/
public Handler getHandler()
{
return _handler;
}
/* ------------------------------------------------------------ */
/**
* @return Returns the handlers.
*/
@Override
public Handler[] getHandlers()
{
return new Handler[]
{ _handler };
}
/* ------------------------------------------------------------ */
/**
* @param handler
* Set the {@link Handler} which should be wrapped.
*/
public void setHandler(Handler handler)
{
if (handler == null)
throw new IllegalArgumentException("Parameter handler is null.");
try
{
updateBean(_handler,handler);
_handler=handler;
Server server = getServer();
handler.setServer(server);
}
catch (Exception e)
{
throw new RuntimeException(e);
}
}
/* ------------------------------------------------------------ */
/*
* @see org.eclipse.thread.AbstractLifeCycle#doStart()
*/
@Override
protected void doStart() throws Exception
{
super.doStart();
}
/* ------------------------------------------------------------ */
/*
* @see org.eclipse.thread.AbstractLifeCycle#doStop()
*/
@Override
protected void doStop() throws Exception
{
super.doStop();
}
/* ------------------------------------------------------------ */
/*
* @see org.eclipse.jetty.server.server.EventHandler#handle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
*/
@Override
public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
{
if (_handler != null && isStarted())
{
_handler.handle(target,baseRequest,request,response);
}
}
/* ------------------------------------------------------------ */
@Override
public void setServer(Server server)
{
if (isRunning())
throw new IllegalStateException(RUNNING);
super.setServer(server);
Handler h = getHandler();
if (h != null)
h.setServer(server);
}
/* ------------------------------------------------------------ */
@Override
protected void expandChildren(List<Handler> list, Class<?> byClass)
{
expandHandler(_handler,list,byClass);
}
/* ------------------------------------------------------------ */
@Override
public void destroy()
{
if (!isStopped())
throw new IllegalStateException("!STOPPED");
Handler child = getHandler();
if (child != null)
{
setHandler(null);
child.destroy();
}
super.destroy();
}
}