This looks very interesting. Thank you for the thorough example - much
appreciated.
Adam
----- Original Message -----
From: "Scott M Stark" <[EMAIL PROTECTED]>
To: "jBoss" <[EMAIL PROTECTED]>
Sent: Tuesday, November 21, 2000 11:46 PM
Subject: Re: [jBoss-User] Sharing a single object instance with JNDI
> Here is an example of binding a non-Serializable object into the jboss
JNDI namespace.
> I have a MBean that binds a JNDI implementation of a attributed filesystem
into the
> jboss app server at startup. The DirContext/Context objects in this
implementation are
> not serializable. Using Reference, RefAddr & ObjectFactory you can put
basically
> anything into a JNDI namespace. Below are the relevant code fragments. The
trick here
> is to first associated the projectContext object with the inmemory
Hashtable of the
> NonSerializableWrapper class. I then bind a Reference at the location
where I want
> to access the projectContext object. When the lookup against this location
is performed:
> // Test a lookup against the projectContext
> DirContext dirContext = (DirContext) ctx.lookup("inmemory:/test");
>
> The jboss JNDI provider resolves the reference to the object using the
ObjectFactory
> associated with the Reference. There is a good tutorial on all of this on
the javasoft site:
> http://java.sun.com/products/jndi/tutorial/index.html
>
>
> public class ProjectDirContext extends NotificationBroadcasterSupport
> implements MBeanRegistration, NotificationBroadcaster,
ProjectDirContextMBean
> {
>
> public static class NonSerializableWrapper implements ObjectFactory
> {
> private static Hashtable wrapperTable = new Hashtable();
>
> public static void add(String key, Object target)
> {
> wrapperTable.put(key, target);
> }
>
> public Object getObjectInstance(Object obj, Name name, Context nameCtx,
Hashtable env) throws Exception
> { // Use the last name component as the key atom
> Reference ref = (Reference) obj;
> RefAddr addr = ref.get("Hashtable.key");
> String key = (String) addr.getContent();
> Object target = wrapperTable.get(key);
> System.out.println("getObjectInstance, key="+key+",name="+name+" ->
"+target);
> return target;
> }
> }
>
> public ObjectName preRegister(MBeanServer server, ObjectName name) throws
Exception
> {
> try
> { // Create the filesystem root context
> env.put(Context.INITIAL_CONTEXT_FACTORY,
"com.dscape.projects.documents.jndi.FSDirInitialContextFactory");
> env.put(Context.PROVIDER_URL,
"file:///temp/project_repository/NewProject/");
> InitialDirContext projectContext = new InitialDirContext(env);
> BasicAttributes attributes = new BasicAttributes();
> attributes.put("elementType", "ProjectFolder");
> projectContext.createSubcontext("test", attributes);
> NonSerializableWrapper.add("ProjectDirContext", projectContext);
>
> Context ctx = (Context) new InitialContext();
> // Bind a reference to the projectContext using NonSerializableWrapper
as the ObjectFactory
> String className = "javax.naming.directory.DirContext";
> String factory = NonSerializableWrapper.class.getName();
> StringRefAddr addr = new StringRefAddr("Hashtable.key",
"ProjectDirContext");
> Reference memoryRef = new Reference(className, addr, factory, null);
> ctx.rebind("inmemory:", memoryRef);
> // Test a lookup against the projectContext
> DirContext dirContext = (DirContext) ctx.lookup("inmemory:/test");
> }
> catch(NamingException e)
> {
> throw new MBeanRegistrationException(e,
> "Failed to bind project DirContext into JNDI");
> }
> return new ObjectName(OBJECT_NAME);
> }
> ...
> }
>
>
>
> ----- Original Message -----
> From: "marc fleury" <[EMAIL PROTECTED]>
> To: "jBoss" <[EMAIL PROTECTED]>
> Sent: Tuesday, November 21, 2000 6:24 PM
> Subject: RE: [jBoss-User] Sharing a single object instance with JNDI
>
>
> > We store serializable object by default. Yes it is a feature we might
add.
> > Also I believe that Rickard coded a VM only namespace under java: (?
> > rickard)
> >
> > marc
> >
> >
>
>
>
>
> --
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