To configure a topic, set the topic name, decide on statistics and global ordering, and set message listeners. Default values are:

  • global-ordering is false, meaning that by default, there is no guarantee of global order.
  • statistics is true, meaning that by default, statistics are calculated.

You can see the example configuration snippets below.


  <topic name="yourTopicName">


TopicConfig topicConfig = new TopicConfig();
topicConfig.setGlobalOrderingEnabled( true );
topicConfig.setStatisticsEnabled( true );
topicConfig.setName( "yourTopicName" );
MessageListener<String> implementation = new MessageListener<String>() {
  public void onMessage( Message<String> message ) {
    // process the message
topicConfig.addMessageListenerConfig( new ListenerConfig( implementation ) );
HazelcastInstance instance = Hazelcast.newHazelcastInstance()

Topic configuration has the following elements.

  • statistics-enabled: Default is true, meaning statistics are calculated.
  • global-ordering-enabled: Default is false, meaning there is no global order guarantee.
  • message-listeners: Lets you add listeners (listener classes) for the topic messages.

Besides the above elements, there are the following system properties that are topic related but not topic specific:

  • hazelcast.event.queue.capacity with a default value of 1,000,000
  • hazelcast.event.queue.timeout.millis with a default value of 250
  • hazelcast.event.thread.count with a default value of 5

For a description of these parameters, please see the Global Event Configuration section.