You must start the Java IDL name server before an application or applet that uses its naming service. Installation of the Java IDL product creates a script named tnameserv that starts the Java IDL name server. Start the name server so it runs in the background.

If you do not specify otherwise, the Java IDL name server listens on port 900 for the bootstrap protocol used to implement the ORB resolve_initial_references() and list_initial_references() methods. Specify a different port, for example, 1050, as follows:

example% tnameserv -ORBInitialPort 1050

Clients of the name server must be made aware of the new port number. Do this by setting the org.omg.CORBA.ORBInitialPort property to the new port number when creating the ORB object.

To stop the Java IDL name server, use the relevant operating system command, such as kill(1). Note that names registered with the Java IDL name service disappear when the server is terminated.

The following sample program illustrates how to add names to the namespace. It is a self-contained Name Server client that creates the following simple tree.

Initial Naming Context / \ / \ plans personal /\ / \ calendar schedule

In this example, "plans" is an object reference and "personal" is a naming context that contains two object references: "calendar" and "schedule".

import java.util.Properties; import org.omg.CORBA.*; import org.omg.CosNaming.*;

public class NameClient { public static void main(String args[]) { try {

In the above section, Starting the Java IDL Name Server, the nameserver was started on port 1050. The following code ensures that the client program is aware of this port number.

Properties props = new Properties(); props.put("org.omg.CORBA.ORBInitialPort", "1050"); ORB orb = ORB.init(args, props);

The following code obtains the initial naming context and assigns it to ctx. The second line copies ctx into a dummy object reference, objref, that we will attach to various names and add into the namespace.

NamingContext ctx = NamingContextHelper.narrow (orb.resolve_initial_references("NameService")); NamingContext objref = ctx;

The following code creates a name "plans" of type "text" and binds it to our dummy object reference. "plans" is then added under the initial naming context using rebind. The rebind method allows us to run this program over and over again without getting the exceptions we would get from using bind.

NameComponent nc1 = new NameComponent("plans", "text"); NameComponent[] name1 = {nc1}; ctx.rebind(name1, objref); System.out.println("plans rebind sucessful!");

The following code creates a naming context called "Personal" of type "directory". The resulting object reference, ctx2, is bound to the name and added under the initial naming context.

NameComponent nc2 = new NameComponent("Personal", "directory"); NameComponent[] name2 = {nc2}; NamingContext ctx2 = ctx.bind_new_context(n); System.out.println("new naming context added..");

The remainder of the code binds the dummy object reference using the names "schedule" and "calendar" under the "Personal" naming context (ctx2).

NameComponent nc3 = new NameComponent("schedule", "text"); NameComponent[] name3 = {nc3}; ctx2.rebind(name3, objref); System.out.println("schedule rebind sucessful!");

NameComponent nc4 = new NameComponent("calender", "text"); NameComponent[] name4 = {nc4}; ctx2.rebind(name4, objref); System.out.println("calender rebind sucessful!");

} catch (Exception e) { e.printStackTrace(System.err); } } }

The following sample program illustrates how to browse the namespace.

import java.util.Properties; import org.omg.CORBA.*; import org.omg.CosNaming.*;

public class NameClientList { public static void main(String args[]) { try {

In the above section, Starting the Java IDL Name Server, the nameserver was started on port 1050. The following code ensures that the client program is aware of this port number.

Properties props = new Properties(); props.put("org.omg.CORBA.ORBInitialPort", "1050"); ORB orb = ORB.init(args, props);

The following code obtains the initial naming context.

NamingContext nc = NamingContextHelper.narrow (orb.resolve_initial_references("NameService"));

The list method lists the bindings in the naming context. In this case, up to 1000 bindings from the initial naming context will be returned in the BindingListHolder; any remaining bindings are returned in the BindingIteratorHolder.

BindingListHolder bl = new BindingListHolder(); BindingIteratorHolder blIt= new BindingIteratorHolder(); nc.list(1000, bl, blIt);

The following code gets the array of bindings out of the returned BindingListHolder. If there are no bindings, the program ends.

Binding bindings[] = bl.value; if (bindings.length == 0) return;

The remainder of the code loops through the bindings and prints the names out.

for (int i=0; i < bindings.length; i++) {

// get the object reference for each binding org.omg.CORBA.Object obj = nc.resolve (bindings[i].binding_name); String objStr = orb.object_to_string(obj); int lastIx = bindings[i].binding_name.length-1;

// check to see if this is a naming context if (bindings[i].binding_type == BindingType.ncontext) { System.out.println ("Context: " + bindings[i].binding_name[lastIx].id); } else { System.out.println ("Object: " + bindings[i].binding_name[lastIx].id); } }

} catch (Exception e) { e.printStackTrace(System.err); } } }