code: public Observable<HybridRunbookWorkerGroupInner> getAsync(String resourceGroupName, String automationAccountName, String hybridRunbookWorkerGroupName) {
          return getWithServiceResponseAsync(resourceGroupName, automationAccountName, hybridRunbookWorkerGroupName).map(new Func1<ServiceResponse<HybridRunbookWorkerGroupInner>, HybridRunbookWorkerGroupInner>() {
              @Override
              public HybridRunbookWorkerGroupInner call(ServiceResponse<HybridRunbookWorkerGroupInner> response) {
                  return response.body();
              }
          });
      }
docs: Retrieve a hybrid runbook worker group.
  
  @param resourceGroupName Name of an Azure Resource group.
  @param automationAccountName The name of the automation account.
  @param hybridRunbookWorkerGroupName The hybrid runbook worker group name
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the HybridRunbookWorkerGroupInner object