code: public Observable<AzureFirewallInner> beginCreateOrUpdateAsync(String resourceGroupName, String azureFirewallName, AzureFirewallInner parameters) {
          return beginCreateOrUpdateWithServiceResponseAsync(resourceGroupName, azureFirewallName, parameters).map(new Func1<ServiceResponse<AzureFirewallInner>, AzureFirewallInner>() {
              @Override
              public AzureFirewallInner call(ServiceResponse<AzureFirewallInner> response) {
                  return response.body();
              }
          });
      }
docs: Creates or updates the specified Azure Firewall.
  
  @param resourceGroupName The name of the resource group.
  @param azureFirewallName The name of the Azure Firewall.
  @param parameters Parameters supplied to the create or update Azure Firewall operation.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the AzureFirewallInner object