CometD Java Client Publish

Java CometD Client API: Publishing

Publishing a message on a channel is achieved using the method:

BayeuxClient.publish(String channel, Object data, String messageId)

A typical example is:

HttpClient httpClient = ...
BayeuxClient client = new BayeuxClient(httpClient, "http://localhost:8080/cometd");
client.start();

Map<String, Object> data = new HashMap<String, Object>();
// Fill in the data
client.publish("/game/table/1", data, null);

Like its JavaScript counterpart, publishing data on a channel is an asynchronous operation.

Note
Calling publish() does not mean that you have published the message when publish() returns.

Message batching works in a way similar to the JavaScript message batching:

HttpClient httpClient = ...
BayeuxClient client = new BayeuxClient(httpClient, "http://localhost:8080/cometd");
client.start();

client.startBatch();
try
{
    Map<String, Object> data = new HashMap<String, Object>();
    // Fill in the data map object
    client.publish("/game/table/1", data, null);

    Map<String, Object> extra = new HashMap<String, Object>();
    // Fill in the extra map object
    client.publish("/extra/1", data, null);
}
finally
{
    client.endBatch();
}

Warning
Remember to call endBatch() after having called startBatch(), for example in a finally block.
If you don't, your messages will continue to queue up, and your application will not work as expected.