question: public boolean toActive ( ) { LifecycleState state ; synchronized ( this ) { state = _state ; if ( state . isAfterActive ( ) && ! state . isStopped ( ) ) { return false ; } _state = ACTIVE ; _lastChangeTime = CurrentTime . currentTime ( ) ; } if ( _log != null && _log . isLoggable ( _level ) ) _log . log ( _level , "active " + _name ) ; notifyListeners ( state , ACTIVE ) ; return true ; }
target:  Changes to the active state.