question: private boolean doStart ( ) { if ( ! _lifecycle . isActive ( ) ) { return false ; } if ( ! isEnable ( ) ) { return false ; } int startingCount = _startingCount . get ( ) ; int threadCount = _threadCount . get ( ) + startingCount ; if ( _threadMax < threadCount ) { onThreadMax ( ) ; return false ; } else if ( ! isIdleTooLow ( startingCount ) ) { return false ; } _idleCount . incrementAndGet ( ) ; startConnection ( ) ; return true ; }
target:  Checks if the launcher should start another thread.