code: public Observable<ApplicationSecurityGroupInner> getByResourceGroupAsync(String resourceGroupName, String applicationSecurityGroupName) {
          return getByResourceGroupWithServiceResponseAsync(resourceGroupName, applicationSecurityGroupName).map(new Func1<ServiceResponse<ApplicationSecurityGroupInner>, ApplicationSecurityGroupInner>() {
              @Override
              public ApplicationSecurityGroupInner call(ServiceResponse<ApplicationSecurityGroupInner> response) {
                  return response.body();
              }
          });
      }
docs: Gets information about the specified application security group.
  
  @param resourceGroupName The name of the resource group.
  @param applicationSecurityGroupName The name of the application security group.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the ApplicationSecurityGroupInner object