24.13.2. Subscribing to a JMS Topic

The following example demonstrates how to subscribe to a JMS Topic:

function subscriptionCallback(message) { 
    if (message instanceof Seam.Remoting.TextMessage) 
        alert("Received message: " + message.getText()); 
}           
Seam.Remoting.subscribe("topicName", subscriptionCallback);

The Seam.Remoting.subscribe() method accepts two parameters: the name of the JMS topic to subscribe to, and the callback function to invoke when a message is received.

Two message types are supported: Text messages, and Object messages. To test for the message type that is passed to your callback function, use the instanceof operator. This tests whether the message is a Seam.Remoting.TextMessage or Seam.Remoting.ObjectMessage. A TextMessage contains the text value in its text field. (You can also fetch this value by calling the object's getText() method.) An ObjectMessage contains its object value in its value field. (You can also fetch this value by calling the object's getValue() method.)