private synchronized void maybeMakeStateMachineTable() {
    if (stateMachineTable == null) {
      makeStateMachineTable();
    }
  }
Effect a transition due to the effecting stimulus.
@param oldState current state
@param eventType trigger to initiate the transition
@param event causal eventType context
@return transitioned state
ambari-server/src/main/java/org/apache/ambari/server/state/fsm/StateMachineFactory.java