code: public ServiceFuture<List<ExpressRouteCircuitAuthorizationInner>> listAsync(final String resourceGroupName, final String circuitName, final ListOperationCallback<ExpressRouteCircuitAuthorizationInner> serviceCallback) {
          return AzureServiceFuture.fromPageResponse(
              listSinglePageAsync(resourceGroupName, circuitName),
              new Func1<String, Observable<ServiceResponse<Page<ExpressRouteCircuitAuthorizationInner>>>>() {
                  @Override
                  public Observable<ServiceResponse<Page<ExpressRouteCircuitAuthorizationInner>>> call(String nextPageLink) {
                      return listNextSinglePageAsync(nextPageLink);
                  }
              },
              serviceCallback);
      }
docs: Gets all authorizations in an express route circuit.
  
  @param resourceGroupName The name of the resource group.
  @param circuitName The name of the circuit.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object