code: public ServiceFuture<PolicySetDefinitionInner> getAtManagementGroupAsync(String policySetDefinitionName, String managementGroupId, final ServiceCallback<PolicySetDefinitionInner> serviceCallback) {
          return ServiceFuture.fromResponse(getAtManagementGroupWithServiceResponseAsync(policySetDefinitionName, managementGroupId), serviceCallback);
      }
docs: Retrieves a policy set definition.
  This operation retrieves the policy set definition in the given management group with the given name.
  
  @param policySetDefinitionName The name of the policy set definition to get.
  @param managementGroupId The ID of the management group.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object