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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