Examples of javax.naming.LinkRef

javax.naming.LinkRef
This class represents a Reference whose contents is a name, called the link name, that is bound to an atomic name in a context.
The name is a URL, or a name to be resolved relative to the initial context, or if the first character of the name is ".", the name is relative to the context in which the link is bound.
Normal resolution of names in context operations always follow links. Resolution of the link name itself may cause resolution to pass through other links. This gives rise to the possibility of a cycle of links whose resolution could not terminate normally. As a simple means to avoid such non-terminating resolutions, service providers may define limits on the number of links that may be involved in any single operation invoked by the caller.
A LinkRef contains a single StringRefAddr, whose type is "LinkAddress", and whose contents is the link name. The class name field of the Reference is that of this (LinkRef) class.
LinkRef is bound to a name using the normal Context.bind()/rebind(), and DirContext.bind()/rebind(). Context.lookupLink() is used to retrieve the link itself if the terminal atomic name is bound to a link.
Many naming systems support a native notion of link that may be used within the naming system itself. JNDI does not specify whether there is any relationship between such native links and JNDI links.
A LinkRef instance is not synchronized against concurrent access by multiple threads. Threads that need to access a LinkRef instance concurrently should synchronize amongst themselves and provide the necessary locking. @author Rosanna Lee @author Scott Seligman @see LinkException @see LinkLoopException @see MalformedLinkException @see Context#lookupLink @since 1.3

            namingException.setRootCause(e);
            throw namingException;
         }
         try
         {
            Util.rebind(getEnc(), "TransactionSynchronizationRegistry", new LinkRef("java:TransactionSynchronizationRegistry"));
            log.debug("Linked java:comp/TransactionSynchronizationRegistry to JNDI name: java:TransactionSynchronizationRegistry");
         }
         catch (NamingException e)
         {
            NamingException namingException = new NamingException("Could not bind TransactionSynchronizationRegistry for ejb name " + ejbName + " into JNDI under jndiName: " + getEnc().getNameInNamespace() + "/" + "TransactionSynchronizationRegistry");

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    @Test
    public void testLookupLink() throws Exception {
        final Name name = new CompositeName("test");
        namingStore.bind(name, "testValue", String.class);
        final Name linkName = new CompositeName("link");
        namingStore.bind(linkName, new LinkRef("./test"));
        Object result = namingContext.lookup(linkName);
        assertEquals("testValue", result);


        System.setProperty(Context.INITIAL_CONTEXT_FACTORY, InitialContextFactory.class.getName());
        namingStore.rebind(linkName, new LinkRef(name));
        result = namingContext.lookup(linkName);
        assertEquals("testValue", result);
    }

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               {
                  log.debug("Unable to retrieve orb: " + t.toString());
               }


               // JTA links
               envCtx.bind("TransactionSynchronizationRegistry", new LinkRef("java:TransactionSynchronizationRegistry"));
               log.debug("Linked java:comp/TransactionSynchronizationRegistry to JNDI name: java:TransactionSynchronizationRegistry");
               envCtx.bind("UserTransaction", new LinkRef("UserTransaction"));
               log.debug("Linked java:comp/UserTransaction to JNDI name: UserTransaction");
               envCtx = envCtx.createSubcontext("env");
               injectionContainer.populateEnc(webLoader.getClassLoader());


               // TODO: this should be bindings in the metadata

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    }


    private Object resolveLink(Object result) throws NamingException {
        final Object linkResult;
        try {
            final LinkRef linkRef = (LinkRef) result;
            final String referenceName = linkRef.getLinkName();
            if (referenceName.startsWith("./")) {
                linkResult = lookup(referenceName.substring(2));
            } else {
                linkResult = new InitialContext().lookup(referenceName);
            }

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//         Reference ref = new Reference(EJBContext.class.getName(), EJBContextFactory.class.getName(), null);
//         ref.add(new StringRefAddr("containerGuid", Ejb3Registry.guid(this)));
//         ref.add(new StringRefAddr("containerClusterUid", Ejb3Registry.clusterUid(this)));
//         ref.add(new StringRefAddr("isClustered", Boolean.toString(isClustered())));
         // TODO: a temporary measure until jboss-injection is in place
         LinkRef ref = new LinkRef("java:internal/EJBContext");
         Util.rebind(getEnc(), "EJBContext", ref);
      }
      catch (NamingException e)
      {
         throw new RuntimeException(e);

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   @Deprecated
   private void bindORB()
   {
      try
      {
         Util.rebind(getEnc(), "ORB", new LinkRef("java:/JBossCorbaORB"));
      }
      catch(NamingException e)
      {
         throw new RuntimeException(e);
      }

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   @Deprecated
   private void bindTimerService() throws NamingException
   {
      // link to java:internal/TimerService (which is setup by
      // org.jboss.ejb3.timerservice.naming.TimerServiceBinder)
      LinkRef timerServiceLinkRef = new LinkRef("java:internal/TimerService");
      // bind to java:comp/TimerService
      Util.rebind(getEnc(), "TimerService", timerServiceLinkRef);
   }

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            namingException.setRootCause(e);
            throw namingException;
         }
         try
         {
            Util.rebind(getEnc(), "TransactionSynchronizationRegistry", new LinkRef("java:TransactionSynchronizationRegistry"));
            log.debug("Linked java:comp/TransactionSynchronizationRegistry to JNDI name: java:TransactionSynchronizationRegistry");
         }
         catch (NamingException e)
         {
            NamingException namingException = new NamingException("Could not bind TransactionSynchronizationRegistry for ejb name " + ejbName + " into JNDI under jndiName: " + getEnc().getNameInNamespace() + "/" + "TransactionSynchronizationRegistry");

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                    return value;
                }
            }
        }
        if (result instanceof LinkRef) {
            LinkRef ref = (LinkRef)result;
            result = lookup(ref.getLinkName());
        }
        if (result instanceof Reference) {
            try {
                result = NamingManager.getObjectInstance(result, null, null, this.environment);
            } catch (NamingException e) {

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                    return value;
                }
            }
        }
        if (result instanceof LinkRef) {
            LinkRef ref = (LinkRef)result;
            result = lookup(ref.getLinkName());
        }
        if (result instanceof Reference) {
            try {
                result = NamingManager.getObjectInstance(result, null, null, this.environment);
            } catch (NamingException e) {

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