public Observable<List<BackupManagementUsageInner>> listAsync(String vaultName, String resourceGroupName) {
        return listWithServiceResponseAsync(vaultName, resourceGroupName).map(new Func1<ServiceResponse<List<BackupManagementUsageInner>>, List<BackupManagementUsageInner>>() {
            @Override
            public List<BackupManagementUsageInner> call(ServiceResponse<List<BackupManagementUsageInner>> response) {
                return response.body();
            }
        });
    }
public Observable < List < BackupManagementUsageInner > > listAsync ( String vaultName , String resourceGroupName ) { return listWithServiceResponseAsync ( vaultName , resourceGroupName ) . map ( new Func1 < ServiceResponse < List < BackupManagementUsageInner > > , List < BackupManagementUsageInner > > ( ) { @ Override public List < BackupManagementUsageInner > call ( ServiceResponse < List < BackupManagementUsageInner > > response ) { return response . body ( ) ; } } ) ; }
Fetches the backup management usage summaries of the vault.

@param vaultName The name of the recovery services vault.
@param resourceGroupName The name of the resource group where the recovery services vault is present.
@throws IllegalArgumentException thrown if parameters fail the validation
@return the observable to the List&lt;BackupManagementUsageInner&gt; object