Topic Use Cases
[Programming How-To's]

Working with topics. More...

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
    }