@Override
  public void execute(FunctionContext<Object[]> context) {
    ResultSender<Object> resultSender = context.getResultSender();

    Cache cache = context.getCache();
    String memberNameOrId = context.getMemberName();

    Object[] gatewayReceiverCreateArgs =
        context.getArguments();
    GatewayReceiverConfig gatewayReceiverConfig =
        (GatewayReceiverConfig) gatewayReceiverCreateArgs[0];
    Boolean ifNotExist = (Boolean) gatewayReceiverCreateArgs[1];

    // Exit early if a receiver already exists.
    // Consider this a failure unless --if-not-exists was provided.
    if (gatewayReceiverExists(cache)) {
      CliFunctionResult result;
      if (ifNotExist) {
        result = new CliFunctionResult(memberNameOrId, CliFunctionResult.StatusState.OK,
            "Skipping: " + A_GATEWAY_RECEIVER_ALREADY_EXISTS_ON_THIS_MEMBER);
      } else {
        Exception illegalState =
            new IllegalStateException(A_GATEWAY_RECEIVER_ALREADY_EXISTS_ON_THIS_MEMBER);
        result = new CliFunctionResult(memberNameOrId, illegalState, illegalState.getMessage());
      }
      resultSender.lastResult(result);
      return;
    }


    try {
      GatewayReceiver createdGatewayReceiver = createGatewayReceiver(cache, gatewayReceiverConfig);

      resultSender.lastResult(new CliFunctionResult(memberNameOrId,
          CliFunctionResult.StatusState.OK,
          CliStrings.format(
              CliStrings.CREATE_GATEWAYRECEIVER__MSG__GATEWAYRECEIVER_CREATED_ON_0_ONPORT_1,
              memberNameOrId, Integer.toString(createdGatewayReceiver.getPort()))));
    } catch (IllegalStateException e) {
      // no need to log the stack trace
      resultSender.lastResult(new CliFunctionResult(memberNameOrId, e, e.getMessage()));
    } catch (Exception e) {
      logger.error(e.getMessage(), e);
      resultSender.lastResult(new CliFunctionResult(memberNameOrId, e, e.getMessage()));
    }

  }
The function to a create GatewayReceiver using given configuration parameters.
geode-gfsh/src/main/java/org/apache/geode/management/internal/cli/functions/GatewayReceiverCreateFunction.java