code: public ServiceFuture<ConnectionSharedKeyInner> getSharedKeyAsync(String resourceGroupName, String virtualNetworkGatewayConnectionName, final ServiceCallback<ConnectionSharedKeyInner> serviceCallback) {
          return ServiceFuture.fromResponse(getSharedKeyWithServiceResponseAsync(resourceGroupName, virtualNetworkGatewayConnectionName), serviceCallback);
      }
docs: The Get VirtualNetworkGatewayConnectionSharedKey operation retrieves information about the specified virtual network gateway connection shared key through Network resource provider.
  
  @param resourceGroupName The name of the resource group.
  @param virtualNetworkGatewayConnectionName The virtual network gateway connection shared key name.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object