for (String instance : curInstances.keySet()) {
if (lastInstances == null || !lastInstances.containsKey(instance)) {
try {
// add message listeners for new sessions
manager.addMessageListener(this, instance);
LOG.info("Succeed in adding message listener for " + instance);
}
catch (Exception e)
{
LOG.error("Fail to add message listener for instance:" + instance, e);