public StateMachine<STATE, EVENTTYPE, EVENT>
        make(OPERAND operand, STATE initialState) {
    return new InternalStateMachine(operand, initialState);
  }
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