code: public ServiceFuture<ContainerServiceInner> getByResourceGroupAsync(String resourceGroupName, String containerServiceName, final ServiceCallback<ContainerServiceInner> serviceCallback) {
          return ServiceFuture.fromResponse(getByResourceGroupWithServiceResponseAsync(resourceGroupName, containerServiceName), serviceCallback);
      }
docs: Gets the properties of the specified container service.
  Gets the properties of the specified container service in the specified subscription and resource group. The operation returns the properties including state, orchestrator, number of masters and agents, and FQDNs of masters and agents.
  
  @param resourceGroupName The name of the resource group.
  @param containerServiceName The name of the container service in the specified subscription and resource group.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object