code: public Observable<ServiceObjectiveInner> getAsync(String resourceGroupName, String serverName, String serviceObjectiveName) {
          return getWithServiceResponseAsync(resourceGroupName, serverName, serviceObjectiveName).map(new Func1<ServiceResponse<ServiceObjectiveInner>, ServiceObjectiveInner>() {
              @Override
              public ServiceObjectiveInner call(ServiceResponse<ServiceObjectiveInner> response) {
                  return response.body();
              }
          });
      }
docs: Gets a database service objective.
  
  @param resourceGroupName The name of the resource group that contains the resource. You can obtain this value from the Azure Resource Manager API or the portal.
  @param serverName The name of the server.
  @param serviceObjectiveName The name of the service objective to retrieve.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the ServiceObjectiveInner object