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view src/org/eclipse/jetty/server/handler/HandlerCollection.java @ 895:49ff91097d6c
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author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Thu, 06 Oct 2016 23:43:36 -0600 |
parents | b9aa175d9a29 |
children | 32d4b569567c |
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// // ======================================================================== // 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); } // 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().threadPool.execute( 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); } /* ------------------------------------------------------------ */ /* 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(); } }