--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/org/eclipse/jetty/server/handler/HandlerCollection.java	Wed Sep 07 21:15:48 2016 -0600
@@ -0,0 +1,316 @@
+//
+//  ========================================================================
+//  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.concurrent.CountDownLatch;
+
+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.LazyList;
+import org.eclipse.jetty.util.MultiException;
+
+/* ------------------------------------------------------------ */
+/** A collection of handlers.  
+ * <p>
+ * 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.
+ * <p>
+ * 
+ * @org.apache.xbean.XBean
+ */
+public class HandlerCollection extends AbstractHandlerContainer
+{
+    private final boolean _mutableWhenRunning;
+    private volatile Handler[] _handlers;
+    private boolean _parallelStart=false; 
+
+    /* ------------------------------------------------------------ */
+    public HandlerCollection()
+    {
+        _mutableWhenRunning=false;
+    }
+    
+    /* ------------------------------------------------------------ */
+    public HandlerCollection(boolean mutableWhenRunning)
+    {
+        _mutableWhenRunning=mutableWhenRunning;
+    }
+
+    /* ------------------------------------------------------------ */
+    /**
+     * @return Returns the handlers.
+     */
+    public Handler[] getHandlers()
+    {
+        return _handlers;
+    }
+    
+    /* ------------------------------------------------------------ */
+    /**
+     * 
+     * @param handlers The handlers to set.
+     */
+    public void setHandlers(Handler[] handlers)
+    {
+        if (!_mutableWhenRunning && isStarted())
+            throw new IllegalStateException(STARTED);
+        
+        Handler [] old_handlers = _handlers==null?null:_handlers.clone();
+        _handlers = handlers;
+        
+        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);
+        }
+
+        if (getServer()!=null)
+            getServer().getContainer().update(this, old_handlers, handlers, "handler");
+        
+        // stop old 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();
+    }
+    
+
+    
+    /* ------------------------------------------------------------ */
+    /** Get the parrallelStart.
+     * @return true if the contained handlers are started in parallel.
+     */
+    public boolean isParallelStart()
+    {
+        return _parallelStart;
+    }
+
+
+
+    /* ------------------------------------------------------------ */
+    /** Set the parallelStart.
+     * @param parallelStart If true, contained handlers are started in parallel.
+     */
+    public void setParallelStart(boolean parallelStart)
+    {
+        this._parallelStart = parallelStart;
+    }
+
+
+    /* ------------------------------------------------------------ */
+    /**
+     * @see Handler#handle(String, Request, HttpServletRequest, HttpServletResponse)
+     */
+    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);
+            }
+            
+        }    
+    }
+
+    /* ------------------------------------------------------------ */
+    /* 
+     * @see org.eclipse.jetty.server.server.handler.AbstractHandler#doStart()
+     */
+    @Override
+    protected void doStart() throws Exception
+    {
+        final MultiException mex=new MultiException();
+        if (_handlers!=null)
+        {
+            if (_parallelStart)
+            {
+                final CountDownLatch latch = new CountDownLatch(_handlers.length);
+                final ClassLoader loader = Thread.currentThread().getContextClassLoader();
+                for (int i=0;i<_handlers.length;i++)
+                {
+                    final int h=i;
+                    getServer().getThreadPool().dispatch(
+                            new Runnable()
+                            {
+                                public void run()
+                                {
+                                    ClassLoader orig = Thread.currentThread().getContextClassLoader();
+                                    try
+                                    {
+                                        Thread.currentThread().setContextClassLoader(loader);
+                                        _handlers[h].start();
+                                    }
+                                    catch(Throwable e)
+                                    {
+                                        mex.add(e);
+                                    }
+                                    finally
+                                    {
+                                        Thread.currentThread().setContextClassLoader(orig);
+                                        latch.countDown();
+                                    }
+                                }
+                            }
+                    );
+                }
+                latch.await();
+            }
+            else
+            {
+                for (int i=0;i<_handlers.length;i++)
+                {
+                    try{_handlers[i].start();}
+                    catch(Throwable e){mex.add(e);}
+                }
+            }
+        }
+        super.doStart();
+        mex.ifExceptionThrow();
+    }
+
+    /* ------------------------------------------------------------ */
+    /* 
+     * @see org.eclipse.jetty.server.server.handler.AbstractHandler#doStop()
+     */
+    @Override
+    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();
+    }
+    
+    /* ------------------------------------------------------------ */
+    @Override
+    public void setServer(Server server)
+    {
+        if (isStarted())
+            throw new IllegalStateException(STARTED);
+        
+        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.eclipse.jetty.server.server.HandlerContainer#addHandler(org.eclipse.jetty.server.server.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));
+    }
+
+    /* ------------------------------------------------------------ */
+    @Override
+    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;
+    }
+
+    /* ------------------------------------------------------------ */
+    @Override
+    public void destroy()
+    {
+        if (!isStopped())
+            throw new IllegalStateException("!STOPPED");
+        Handler[] children=getChildHandlers();
+        setHandlers(null);
+        for (Handler child: children)
+            child.destroy();
+        super.destroy();
+    }
+}