private void setMexRole(MyRoleMessageExchangeImpl mex) {
   Operation operation = getMyRoleOperation(mex.getOperationName());
   mex.getDAO().setPartnerLinkModelId(_plinkDef.getId());
   mex.setPortOp(_plinkDef.myRolePortType, operation);
   mex.setPattern(
       operation.getOutput() == null
           ? MessageExchange.MessageExchangePattern.REQUEST_ONLY
           : MessageExchange.MessageExchangePattern.REQUEST_RESPONSE);
 }