Release 10.1A: OpenEdge Development:
Messaging and ESB

Publishing messages to a topic

In the Pub/Sub domain, applications publish messages to topics. To publish a message with Java–JMS, an application obtains a handle to a Topic object and creates a Publisher object. It then uses the Publisher Object to publish messages. Publishing a message to a topic with the 4GL-JMS API involves these general steps:

The application publishes messages through the publish procedure of the pubsubsession.p or jmssession.p object.
The application specifies the topic name as an INPUT parameter of type CHARACTER.

The application can set other sending parameters (such as persistency, timeToLive, and priority) in the Session object as a default for all the messages it sends, or it can set these parameters at each publish procedure call.

Note: If a message being published to a topic has a delivery mode of DISCARDABLE and the destination topic queue is full, the message is automatically discarded.