Examples of javax.naming.Reference

javax.naming.Reference
This class represents a reference to an object that is found outside of the naming/directory system.
Reference provides a way of recording address information about objects which themselves are not directly bound to the naming/directory system.
A Reference consists of an ordered list of addresses and class information about the object being referenced. Each address in the list identifies a communications endpoint for the same conceptual object. The "communications endpoint" is information that indicates how to contact the object. It could be, for example, a network address, a location in memory on the local machine, another process on the same machine, etc. The order of the addresses in the list may be of significance to object factories that interpret the reference.
Multiple addresses may arise for various reasons, such as replication or the object offering interfaces over more than one communication mechanism. The addresses are indexed starting with zero.
A Reference also contains information to assist in creating an instance of the object to which this Reference refers. It contains the class name of that object, and the class name and location of the factory to be used to create the object. The class factory location is a space-separated list of URLs representing the class path used to load the factory. When the factory class (or any class or resource upon which it depends) needs to be loaded, each URL is used (in order) to attempt to load the class.
A Reference instance is not synchronized against concurrent access by multiple threads. Threads that need to access a single Reference concurrently should synchronize amongst themselves and provide the necessary locking. @author Rosanna Lee @author Scott Seligman @see RefAddr @see StringRefAddr @see BinaryRefAddr @since 1.3

            // The context
            context,
            // It should look like so "invokers/<name>/iiop" 
            "invokers/" + InetAddress.getLocalHost().getHostName() + "/iiop", 
            // A reference to this invoker
            new Reference(getClass().getName(), 
                          getClass().getName(), 
                          null));


      log.debug("Bound IIOP invoker for JMX node");
   }

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      InitialContext ctx = new InitialContext();
      try
      {
         StringRefAddr addr = new StringRefAddr("nns", bindName);
         Reference ref = new Reference(Session.class.getName(),
            addr,
            SessionObjectFactory.class.getName(),
            null);
         Util.bind(ctx, bindName, ref);
      }

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      InitialContext ctx = new InitialContext();
      
      //bind myself into JNDI, at java:/CounterService
      NonSerializableFactory.bind(JNDI_NAME, this);
      StringRefAddr addr = new StringRefAddr("nns", JNDI_NAME);
      Reference ref = new Reference(this.getClass().getName(), addr, NonSerializableFactory.class.getName(), null);
      ctx.bind(JNDI_NAME, ref);
   }

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         try {
            // Bind the bean home in the JNDI initial context
            Util.rebind(initialContext,
                        jnpName,
                        new Reference(
                              "javax.ejb.EJBHome",
                              new StringRefAddr("IOR",
                                       orb.object_to_string(
                                               (org.omg.CORBA.Object)ejbHome)),
                              IIOPHomeFactory.class.getName(),

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   // Private -------------------------------------------------------


   private void bind(String name, String className)
      throws Exception
   {
      Reference ref = new Reference(className, getClass().getName(), null);
      new InitialContext().bind("java:/"+name, ref);
   }

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   // Private -------------------------------------------------------


   private void bind(String name, String className)
      throws Exception
   {
      Reference ref = new Reference(className, getClass().getName(), null);
      new InitialContext().bind("java:/"+name, ref);
   }

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                                    "[env] " + (env == null ? "" : env.toString()) + " ");
        }


        if (obj instanceof Reference)
        {
            Reference ref = (Reference) obj;
            if (ref.getClassName().equals(JDOClassNameConstants.JDOPersistenceManagerFactory) ||
                ref.getClassName().equals(JDOClassNameConstants.JAVAX_JDO_PersistenceManagerFactory))
            {
                // Extract the properties to use for PMF creation
                Properties p = new Properties();
                for (Enumeration e = ref.getAll(); e.hasMoreElements();)
                {
                    StringRefAddr sra = (StringRefAddr) e.nextElement();
                    p.setProperty(sra.getType(), (String) sra.getContent());
                }


                // Create the PMF
                pmf = createInstance(p);


                // Freeze the PMF config now that we are handing out PM's : see JDO 1.0.1 [11.7]
                pmf.freezeConfiguration();


                if (JPOXLogger.NAMING.isDebugEnabled())
                {
                    JPOXLogger.NAMING.debug(LOCALISER_JDO.msg("012006", name.toString()));
                }
            }
            else
            {
                JPOXLogger.NAMING.warn(LOCALISER_JDO.msg("012007", 
                    ref.getClassName(), JDOClassNameConstants.JDOPersistenceManagerFactory));
            }
        }
        else
        {
            JPOXLogger.NAMING.warn(LOCALISER_JDO.msg("012008", (obj.getClass().getName())));

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     * Retrieves the (JNDI) reference of this PMF object.
     * @return The reference
     */
    public Reference getReference()
    {
        Reference rc = null;
        ByteArrayOutputStream baos = new ByteArrayOutputStream();


        try
        {
            ObjectOutputStream oos = new ObjectOutputStream(baos);
            oos.writeObject(this);
            rc = new Reference(JDOClassNameConstants.JAVAX_JDO_PersistenceManagerFactory,
                JDOClassNameConstants.JDOPersistenceManagerFactory, null);
            
            Map p = getOptions();
            for (Iterator i = p.keySet().iterator(); i.hasNext();)
            {
                String key = (String) i.next();
                if (p.get(key) instanceof String)
                {
                    String value = (String) p.get(key);
                    rc.add(new StringRefAddr(key, value));
                    if (JPOXLogger.NAMING.isDebugEnabled())
                    {
                        JPOXLogger.NAMING.debug(LOCALISER_JDO.msg("012009", key, value));
                    }
                }
                else if (p.get(key) instanceof Long)
                {
                    String value = "" + p.get(key);
                    rc.add(new StringRefAddr(key, value));
                    if (JPOXLogger.NAMING.isDebugEnabled())
                    {
                        JPOXLogger.NAMING.debug(LOCALISER_JDO.msg("012009", key, value));
                    }
                }
                else if (p.get(key) instanceof Integer)
                {
                    String value = "" + p.get(key);
                    rc.add(new StringRefAddr(key, value));
                    if (JPOXLogger.NAMING.isDebugEnabled())
                    {
                        JPOXLogger.NAMING.debug(LOCALISER_JDO.msg("012009", key, value));
                    }
                }
                else if (p.get(key) instanceof Boolean)
                {
                    String value = (((Boolean)p.get(key)).booleanValue() ? "true" : "false");
                    rc.add(new StringRefAddr(key, value));
                    if (JPOXLogger.NAMING.isDebugEnabled())
                    {
                        JPOXLogger.NAMING.debug(LOCALISER_JDO.msg("012009", key, value));
                    }
                }

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    // javadoc to be copied from javax.naming.Referenceable.getReference()
    public Reference getReference() throws NamingException {


        String    cname = "org.hsqldb.jdbc.JDBCDataSourceFactory";
        Reference ref   = new Reference(getClass().getName(), cname, null);


        ref.add(new StringRefAddr("database", getDatabase()));
        ref.add(new StringRefAddr("user", getUser()));
        ref.add(new StringRefAddr("password", password));


        return ref;
    }

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     */
    public Object getObjectInstance(Object obj, Name name, Context nameCtx,
                                    Hashtable environment) throws Exception {


        String    dsClass = "org.hsqldb.jdbc.JDBCDataSource";
        Reference ref     = (Reference) obj;


        if (ref.getClassName().equals(dsClass)) {
            JDBCDataSource ds = new JDBCDataSource();


            ds.setDatabase((String) ref.get("database").getContent());
            ds.setUser((String) ref.get("user").getContent());
            ds.setPassword((String) ref.get("password").getContent());


            return ds;
        } else {
            return null;
        }

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