org.eclipse.jetty.server.handler.HandlerCollection Maven / Gradle / Ivy
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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 java.util.Arrays;
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;
import org.eclipse.jetty.util.ArrayUtil;
import org.eclipse.jetty.util.MultiException;
import org.eclipse.jetty.util.annotation.ManagedAttribute;
import org.eclipse.jetty.util.annotation.ManagedObject;
/* ------------------------------------------------------------ */
/** A collection of handlers.
*
* The default implementations calls all handlers in list order,
* regardless of the response status or exceptions. Derived implementation
* may alter the order or the conditions of calling the contained
* handlers.
*
*
*/
@ManagedObject("Handler of multiple handlers")
public class HandlerCollection extends AbstractHandlerContainer
{
private final boolean _mutableWhenRunning;
private volatile Handler[] _handlers;
/* ------------------------------------------------------------ */
public HandlerCollection()
{
_mutableWhenRunning=false;
}
/* ------------------------------------------------------------ */
public HandlerCollection(boolean mutableWhenRunning)
{
_mutableWhenRunning=mutableWhenRunning;
}
/* ------------------------------------------------------------ */
/**
* @return Returns the handlers.
*/
@Override
@ManagedAttribute(value="Wrapped handlers", readonly=true)
public Handler[] getHandlers()
{
return _handlers;
}
/* ------------------------------------------------------------ */
/**
* @param handlers The handlers to set.
*/
public void setHandlers(Handler[] handlers)
{
if (!_mutableWhenRunning && isStarted())
throw new IllegalStateException(STARTED);
if (handlers!=null)
for (Handler handler:handlers)
if (handler.getServer()!=getServer())
handler.setServer(getServer());
Handler[] old=_handlers;;
_handlers = handlers;
updateBeans(old, handlers);
}
/* ------------------------------------------------------------ */
/**
* @see Handler#handle(String, Request, HttpServletRequest, HttpServletResponse)
*/
@Override
public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException
{
if (_handlers!=null && isStarted())
{
MultiException mex=null;
for (int i=0;i<_handlers.length;i++)
{
try
{
_handlers[i].handle(target,baseRequest, request, response);
}
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);
}
}
}
/* ------------------------------------------------------------ */
@Override
public void setServer(Server server)
{
super.setServer(server);
Handler[] handlers=getHandlers();
if (handlers!=null)
for (Handler h : handlers)
h.setServer(server);
}
/* ------------------------------------------------------------ */
/* Add a handler.
* This implementation adds the passed handler to the end of the existing collection of handlers.
* @see org.eclipse.jetty.server.server.HandlerContainer#addHandler(org.eclipse.jetty.server.server.Handler)
*/
public void addHandler(Handler handler)
{
setHandlers(ArrayUtil.addToArray(getHandlers(), handler, Handler.class));
}
/* ------------------------------------------------------------ */
public void removeHandler(Handler handler)
{
Handler[] handlers = getHandlers();
if (handlers!=null && handlers.length>0 )
setHandlers(ArrayUtil.removeFromArray(handlers, handler));
}
/* ------------------------------------------------------------ */
@Override
protected void expandChildren(List list, Class byClass)
{
if (getHandlers()!=null)
for (Handler h:getHandlers())
expandHandler(h, list, byClass);
}
/* ------------------------------------------------------------ */
@Override
public void destroy()
{
if (!isStopped())
throw new IllegalStateException("!STOPPED");
Handler[] children=getChildHandlers();
setHandlers(null);
for (Handler child: children)
child.destroy();
super.destroy();
}
/* ------------------------------------------------------------ */
@Override
public String toString()
{
Handler[] handlers=getHandlers();
return super.toString()+(handlers==null?"[]":Arrays.asList(getHandlers()).toString());
}
}