Release 10.1A: OpenEdge Development:
Messaging and ESB

Subscribing to a Pub/Sub topic and receiving messages

The following general steps outline how a 4GL application subscribes to a topic and receives messages:

The application obtains a handle to the Pub/Sub Session object.
The application creates a Message Consumer object by calling the createMessageConsumer procedure.
The application calls the startReceiveMessages procedure in the Session object with the message handle, the name of a destination (a topic name for Pub/Sub), and the Message Consumer handle as input parameters.
The application executes a WAIT–FOR statement (or a waitForMessages procedure call) and processes incoming messages and other 4GL events.
The application deletes the messages after the application finishes using them.