MyDCReceiver(DirectChannelListener up){
  upCall=up;
}

MyDCReceiver ( DirectChannelListener up ) { upCall = up ; }
don ' t provide events until the caller has told us we are ready . synchronization provided via groupmembershipservice . class . note that in practice we only need to delay accepting the first client ; we don ' t need to put this check before every call . . .
