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  /*
  * JBoss, Home of Professional Open Source
  * Copyright 2005, JBoss Inc., and individual contributors as indicated
  * by the @authors tag. See the copyright.txt in the distribution for a
  * full listing of individual contributors.
  *
  * This is free software; you can redistribute it and/or modify it
  * under the terms of the GNU Lesser General Public License as
  * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
 
 package org.jboss.remoting.samples.callback.statistics;
 
 import java.util.List;
Simple remoting server. Uses inner class SampleInvocationHandler as the invocation target handler class, which will generate callback messages upon callback listeners being added.

Author(s):
Tom Elrod
 
 public class CallbackServer
 {
    // Default locator values
    private static String transport = "socket";
    private static String host = "localhost";
    private static int port = 5400;
 
    // counter indicating the number of callbacks generated
    private static int callbackCounter = 1;
 
    // remoting server connector
    private Connector connector = null;
 
    // String to be returned from invocation handler upon client invocation calls.
    private static final String RESPONSE_VALUE = "This is the return to SampleInvocationHandler invocation";

   
Sets up target remoting server.

Parameters:
locatorURI
Throws:
java.lang.Exception
 
    public void setupServer(String locatorURIthrows Exception
    {
       InvokerLocator locator = new InvokerLocator(locatorURI);
       ..println("Starting remoting server with locator uri of: " + locatorURI);
        = new Connector();
       .setInvokerLocator(locator.getLocatorURI());
       .create();
 
       SampleInvocationHandler invocationHandler = new SampleInvocationHandler();
       .addInvocationHandler("sample"invocationHandler);
 
       .start();
    }

   
Shuts down the server
 
    public void shutdownServer()
    {
       .stop();
       .destroy();
    }

   
Can pass transport and port to be used as parameters.
 
    public static void main(String[] args)
    {
       if(args != null && args.length == 2)
       {
          = args[0];
          = Integer.parseInt(args[1]);
      }
      String locatorURI =  + "://" +  + ":" + ;
      CallbackServer server = new CallbackServer();
      try
      {
         server.setupServer(locatorURI);
         // wait forever, let the user kill us at any point (at which point, the client will detect we went down)
         while(true)
         {
            Thread.sleep(1000);
         }
      }
      catch(Exception e)
      {
         e.printStackTrace();
      }
   }

   
Simple invocation handler implementation. When callback clients are registered, will generate callbacks periodically.
   public static class SampleInvocationHandler
   {
      // list of callback listeners registered
      private List listeners = new ArrayList();
      // flag to indicate when should generate callback messages
      private boolean shouldGenerateCallbacks = false;
      public SampleInvocationHandler()
      {
         // will start a new thread for generating callbacks.
         Thread callbackThread = new Thread(this);
         callbackThread.setDaemon(true);
         callbackThread.start();
      }

      
Called by the remoting server to handle the invocation from client.
      public Object invoke(InvocationRequest invocationthrows Throwable
      {
         return ;
      }

      
Adds a callback handler that will listen for callbacks from the server invoker handler.
      public void addListener(InvokerCallbackHandler callbackHandler)
      {
         ..println("Adding callback listener.");
         .add(callbackHandler);
          = true;
      }

      
Removes the callback handler that was listening for callbacks from the server invoker handler.
      public void removeListener(InvokerCallbackHandler callbackHandler)
      {
         ..println("Removing callback listener.");
         .remove(callbackHandler);
         if(.size() == 0)
         {
             = false;
         }
      }

      
Will generate callback messages every second while shouldGenerateCallbacks flag is true.
      public void run()
      {
         // keep looping while waiting to fire callbacks.
         while(true)
         {
            while()
            {
               // create new callback message
               Callback callback = new Callback("Callback " +  + ": This is the payload of callback invocation.");
               ..println("sending callback: " + );
               
               // Register as listener, pass callback id, and ask Remoting to handle acknowledgements.
               HashMap returnPayload = new HashMap();
               returnPayload.put(.this);
               returnPayload.put(.new Integer(++));
               returnPayload.put(."true");
               callback.setReturnPayload(returnPayload);
               
               Iterator itr = .iterator();
               while(itr.hasNext())
               {
                  InvokerCallbackHandler callbackHandler = (InvokerCallbackHandleritr.next();
                  try
                  {
                     callbackHandler.handleCallback(callback);
                  }
                  catch(HandleCallbackException e)
                  {
                     e.printStackTrace();
                  }
               }
               // sleep for a second before firing next callback message
               try
               {
                  Thread.sleep(1000);
               }
               catch(InterruptedException e)
               {
               }
            }
            // sleep for a second before while waiting for flag to be set
            try
            {
               Thread.sleep(1000);
            }
            catch(InterruptedException e)
            {
            }
         }
      }
      public void setMBeanServer(MBeanServer server) {}
      public void setInvoker(ServerInvoker invoker) {}
      
      public void acknowledgeCallback(InvokerCallbackHandler callbackHandlerObject callbackIdObject response)
      {
         ..println("received acknowledgement for callback: " + callbackId);
      }
   }
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