Summary

Locating Objects with corbaloc

Using corbaloc object references

Environment

Orbix 6.3.x
All supported platforms

Question/Problem Description

This article describes how to write an Orbix 6.3, C client and server using a corbaloc URL to locate a direct-persistent object.

Clarifying Information

Corbaloc URLs specify the location of a CORBA service in a human-readable format.
For more information on corbaloc object references, please see the section entitled "Locating Objects with corbaloc" in the Orbix 6 CORBA Programmer's Guides.

Resolution

For direct-persistent servers, human-readable keys are substituted in a corbaloc URL is performed by the plain_text_key plug-in, which holds a transient list of plain text keys.
Firstly, the server obtains a reference to the PlainTextKeyForwarder:

CORBA::Object_var objref = global_orb->resolve_initial_references("IT_PlainTextKeyForwarder");
IT_PlainTextKey::Forwarder_var forwarder = IT_PlainTextKey::Forwarder::_narrow(objref);

The server then registers a service's plain text key (For example "corbaloc_demo_server") and its corresponding object reference with the plain_text_key plug-in:

forwarder->add_plain_text_key(
  "corbaloc_demo_server",
  persistent_poa->create_reference_with_id(
    oid,
    Simple::_tc_SimpleObject->id()
  )
);

On the client-side, the client converts the corbaloc string (containing the host and port for the service) to an object reference and opens a connection directly to the server:

CORBA::Object_var objref = orb->string_to_object(objref_text);

Simple::SimpleObject_var simple = Simple::SimpleObject::_narrow(objref);

On the server-side, the plain_text_key plug-in finds the object reference corresponding to the key in the corbaloc. The object reference is then sent back to the client in a reply message. The client can now send the GIOP Request message to the server.

Support Incidents

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