Event firing has race conditions

[azhuchkov]

Method AbstractStateMachine.internalFire(...) does current state check before acquiring lock - inside processEvents() which actually has state precheck getStatus() != StateMachineStatus.BUSY which allows to pass through error and terminated states.
I suppose that is the reason I've got weird exception that async listener method is not accessible (possible concurrent invocation of terminated event handler).

So, why isIdle() method has this kind of condition? Can it be replaced with getStatus() == StateMachineStatus.IDLE ?