/**
* This method verify if the transition from the current state to dest is valid. If so, the
* current state is updated to dest. The up-to-date current state is returned.
*
* @param src The source state.
* @param dest The destination state.
* @return The curent state.
*/
public synchronized String transitionState(String dest) {
if (stateMachine.isTransitionValid(currentState, dest)) {
currentState = dest;
}
return currentState;
}
