EnsembleTracker and DynamicEnsembleProvider?

gistfile1.java

//Create the ensemble provider and feed the initial string
DynamicEnsembleProvider dynamicEnsembleProvider = new DynamicEnsembleProvider(cluster.getConnectString());
CuratorFramework client = CuratorFrameworkFactory.builder()
                .ensembleProvider(dynamicEnsembleProvider)
                .retryPolicy(new RetryOneTime(1000))
                .build();
                
client.start();
client.blockUntilConnected();

//Create the tracker and add the dynamic ensemble provider as a listener.
EnsembleTracker ensembleTracker = new EnsembleTracker(client);
ensembleTracker.getListenable().addListener(dynamicEnsembleProvider);
ensembleTracker.start();