| // |
| // ======================================================================== |
| // 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 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. |
| */ |
| 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 |
| { |
| Handler old_handler = _handler; |
| _handler = handler; |
| Server server = getServer(); |
| handler.setServer(server); |
| addBean(handler); |
| |
| if (server != null) |
| server.getContainer().update(this,old_handler,handler,"handler"); |
| |
| // if there is an old handler and it was started, stop it |
| if (old_handler != null) |
| { |
| removeBean(old_handler); |
| } |
| |
| } |
| 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) |
| */ |
| 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) |
| { |
| Server old_server = getServer(); |
| if (server == old_server) |
| return; |
| |
| if (isRunning()) |
| throw new IllegalStateException(RUNNING); |
| |
| super.setServer(server); |
| |
| Handler h = getHandler(); |
| if (h != null) |
| h.setServer(server); |
| |
| if (server != null && server != old_server) |
| server.getContainer().update(this,null,_handler,"handler"); |
| } |
| |
| /* ------------------------------------------------------------ */ |
| @SuppressWarnings( |
| { "rawtypes", "unchecked" }) |
| @Override |
| protected Object expandChildren(Object list, Class byClass) |
| { |
| return 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(); |
| } |
| } |