question: protected void updateThrottle ( ) { long now = CurrentTime . getCurrentTimeActual ( ) ; if ( _throttleTimestamp + _throttlePeriod < now ) { _throttleTimestamp = now ; _throttleCount = 1 ; _isThrottle = false ; return ; } _throttleCount ++ ; if ( _throttleCount < _throttleLimit ) { return ; } if ( ! _isThrottle ) { _isThrottle = true ; if ( _throttleSleep > 0 || log . isLoggable ( Level . FINE ) ) { String msg = ( this + " " + _throttleCount + " threads created in " + _throttlePeriod + "ms" + " sleep=" + _throttleSleep + "ms" ) ; onThrottle ( msg ) ; } } if ( _throttleSleep > 0 ) { try { Thread . sleep ( _throttleSleep ) ; } catch ( Exception e ) { } } }
target:  Throttle the thread creation, so only 100 threads/sec (default) can be created.