@Override
public boolean isLeader() {
if (_instanceType != InstanceType.CONTROLLER
&& _instanceType != InstanceType.CONTROLLER_PARTICIPANT) {
return false;
}
if (!isConnected()) {
return false;
}
try {
LiveInstance leader = _dataAccessor.getProperty(_keyBuilder.controllerLeader());
if (leader != null) {
String leaderName = leader.getInstanceName();
String sessionId = leader.getSessionId();
if (leaderName != null
&& leaderName.equals(_instanceName)
&& sessionId != null
&& sessionId.equals(_sessionId)) {
return true;
}
}
} catch (Exception e) {
// log
}
return false;
}
@Override
public void disconnect() {
if (_zkclient == null) {
LOG.info("instanceName: " + _instanceName + " already disconnected");
return;
}
LOG.info("disconnect " + _instanceName + "(" + _instanceType + ") from " + _clusterName);
try {
/** stop all timer tasks */
stopTimerTasks();
/**
* shutdown thread pool first to avoid reset() being invoked in the middle of state transition
*/
_messagingService.getExecutor().shutdown();
// TODO reset user defined handlers only
resetHandlers();
_dataAccessor.shutdown();
if (_leaderElectionHandler != null) {
_leaderElectionHandler.reset();
}
} finally {
_zkclient.close();
_zkclient = null;
LOG.info("Cluster manager: " + _instanceName + " disconnected");
}
}