question: static < V , A > void invokeDirect ( GroupAndInvokeCount myGroupAndInvokeCount , CompletionHandler < V , ? super A > handler , A attachment , V result , Throwable exc ) { myGroupAndInvokeCount . incrementInvokeCount ( ) ; Invoker . invokeUnchecked ( handler , attachment , result , exc ) ; }
target:  Invoke handler assuming thread identity already checked