Topic Use Cases

Working with topics.

Working with topics.

Registering a user data type

• Set up participant
• Register user data type of type Foo under the name "My_Type"

  String type_name = "My_Type";
   
  FooTypeSupport.register_type(participant, type_name);    

Setting up a topic

• Set up participant
• Ensure user data type is registered
• Create a com.rti.dds.topic.Topic under the name "my_topic"

  String topic_name = "my_topic";
  String type_type = "My_Type";   // user data type
  TopicQos topic_qos = new TopicQos();
   
  // MyTopicListener is user defined and 
  // implements TopicListener
  TopicListener topic_listener = new MyTopicListener(); // or = null
   
  participant.get_default_topic_qos(topic_qos);
   
  Topic topic = null;
  try {
      topic = participant.create_topic(topic_name, type_name,
                                       topic_qos, topic_listener,
                                 StatusKind.STATUS_MASK_ALL);
  } catch (RETCODE_ERROR err) {
      // handle exception
  }

Tearing down a topic

• Delete Topic:

  try {
      participant.delete_topic(topic);
  } catch (RETCODE_ERROR err) {
      // handle exception
  }