Examples of java.rmi.registry.Registry

java.rmi.registry.Registry
Registry is a remote interface to a simple remote object registry that provides methods for storing and retrieving remote object references bound with arbitrary string names. The bind, unbind, and rebind methods are used to alter the name bindings in the registry, and the lookup and list methods are used to query the current name bindings.
In its typical usage, a Registry enables RMI client bootstrapping: it provides a simple means for a client to obtain an initial reference to a remote object. Therefore, a registry's remote object implementation is typically exported with a well-known address, such as with a well-known {@link java.rmi.server.ObjID#REGISTRY_ID ObjID} and TCP port number(default is {@link #REGISTRY_PORT 1099}).
The {@link LocateRegistry} class provides a programmatic API forconstructing a bootstrap reference to a Registry at a remote address (see the static getRegistry methods) and for creating and exporting a Registry in the current VM on a particular local address (see the static createRegistry methods).
A Registry implementation may choose to restrict access to some or all of its methods (for example, methods that mutate the registry's bindings may be restricted to calls originating from the local host). If a Registry method chooses to deny access for a given invocation, its implementation may throw {@link java.rmi.AccessException}, which (because it extends {@link java.rmi.RemoteException}) will be wrapped in a {@link java.rmi.ServerException} when caught by aremote client.
The names used for bindings in a Registry are pure strings, not parsed. A service which stores its remote reference in a Registry may wish to use a package name as a prefix in the name binding to reduce the likelihood of name collisions in the registry. @author Ann Wollrath @author Peter Jones @since JDK1.1 @see LocateRegistry

     * @param hostName
     * @return
     * @throws Exception
     */
    public static boolean isEnabled(String hostName) throws Exception {
        Registry myRegistry = LocateRegistry.getRegistry("127.0.0.1", port);
        com.groupon.odo.proxylib.hostsedit.rmi.Message impl = (com.groupon.odo.proxylib.hostsedit.rmi.Message) myRegistry.lookup(SERVICE_NAME);


        return impl.isEnabled(hostName);
    }

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     * @return
     * @throws Exception
     */
    public static boolean isAvailable() throws Exception {
        try {
            Registry myRegistry = LocateRegistry.getRegistry("127.0.0.1", port);
            com.groupon.odo.proxylib.hostsedit.rmi.Message impl = (com.groupon.odo.proxylib.hostsedit.rmi.Message) myRegistry.lookup(SERVICE_NAME);
            return true;
        } catch (Exception e) {
            return false;
        }
    }

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                receivedMessages.add(message);
            }
        };


        // Create server notified by the filter
        final Registry registry = LocateRegistry.createRegistry(4001);
        registry.bind(RMIBroadcastService.class.getSimpleName() + "/RMITopic", service);


        // Create broadcaster
        final AtmosphereConfig config = new AtmosphereFramework().getAtmosphereConfig();
        final DefaultBroadcasterFactory factory = new DefaultBroadcasterFactoryForTest(DefaultBroadcaster.class, "NEVER", config);
        config.framework().setBroadcasterFactory(factory);

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        String serviceName = args[i++];
        String sge_url = args[i++];
        
        try {
            
            Registry reg = null;
            if(registryHost == null) {
                reg = LocateRegistry.getRegistry();
            } else if (registryHost.equals("local")) {
                reg = LocateRegistry.createRegistry(registryPort);
                logger.info("local registry at port " + registryPort + " created" );
            } else if ( registryPort == 0 ) {
                logger.info("Get registry from " + registryHost);
                reg = LocateRegistry.getRegistry(registryHost);
            } else {
                logger.info("Get registry from " + registryHost + ":" + registryPort);
                reg = LocateRegistry.getRegistry(registryHost, registryPort);
            }
            JGDIRemoteFactoryImpl service = new JGDIRemoteFactoryImpl(sge_url);
            Thread.sleep(1000);
            Remote stub = (Remote)UnicastRemoteObject.exportObject(service, 0);
            
            reg.bind(serviceName, stub);
            
            logger.info("JGDIRemoteFactory bound to name " + serviceName );
            
            ShutdownHook shutdownHook = new ShutdownHook(reg, serviceName);
            Runtime.getRuntime().addShutdownHook(shutdownHook);

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      Naming.rebind(name, obj);
    } catch (RemoteException ex){
      ex.printStackTrace();
      if (create) {
        System.out.println("No registry found. Creating one.");
        Registry r = LocateRegistry.createRegistry(Registry.REGISTRY_PORT);
        r.rebind(name, obj);
      } else throw ex;
    }
  }

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   * @throws RemoteException if an error occurs while trying to retrieve the ResultChannel object
   */  
  private static void connectToResultChannel () throws RemoteException {
    log.entering ("com.sun.grid.jgrid.server.JCEPHandler", "connectToResultChannel");
    
    Registry r = LocateRegistry.getRegistry (registryHost, registryPort);
    
    try {
      resultChannel = (ResultChannel)r.lookup (ResultChannel.LOOKUP_NAME);
    }
    catch (NotBoundException e) {
      log.throwing ("com.sun.grid.jgrid.server.JCEPHandler", "connectToResultChannel", e);
      
      throw new RemoteException ("Unable to bind to result channel", e);

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    try {
      Naming.rebind (name, obj);
    } catch (RemoteException ex){
      if (create) {
        ex.printStackTrace ();
        Registry r = LocateRegistry.createRegistry (Registry.REGISTRY_PORT);
        r.rebind (name, obj);
      } else throw ex;
    }
  }

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    HashMap lockbox = new HashMap ();
    
    lockbox.put ("MyJob", new Object ());
    
    ResultChannel resultChannel = new ResultChannelImpl (lockbox);
    Registry r = LocateRegistry.createRegistry (ResultChannel.PORT);
    r.rebind (ResultChannel.LOOKUP_NAME, resultChannel);
  }

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    //Prepare the return data channel
    log.log (Level.FINEST, "Registering ResultChannel");
    try {
      resultChannel = new ResultChannelImpl (lockbox);
      Registry r = LocateRegistry.createRegistry (ResultChannel.PORT);
      r.rebind (ResultChannel.LOOKUP_NAME, resultChannel);
    }
    catch (RemoteException e) {
      log.severe ("Unable to establish return data channel: " + e.getMessage ());
      log.throwing ("com.sun.grid.jgrid.proxy.ComputeProxy", "main", e);

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  /** This method retrieves the ResultChannel object from the registry.
   * @param resultHost the host with the registry containing the ResultChannel
   * @throws RemoteException if an error occurs while trying to retrieve the ResultChannel object
   */  
  private void connectToResultChannel (String resultHost) throws RemoteException {
    Registry r = LocateRegistry.getRegistry(resultHost, ResultChannel.PORT);
    
    try {
      resultChannel = (ResultChannel)r.lookup(ResultChannel.LOOKUP_NAME);
    }
    catch (NotBoundException e) {
      throw new RemoteException("Unable to bind to result channel");
    }
  }

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