code: public Observable<Page<LongTermRetentionBackupInner>> listByDatabaseAsync(final String locationName, final String longTermRetentionServerName, final String longTermRetentionDatabaseName) {
          return listByDatabaseWithServiceResponseAsync(locationName, longTermRetentionServerName, longTermRetentionDatabaseName)
              .map(new Func1<ServiceResponse<Page<LongTermRetentionBackupInner>>, Page<LongTermRetentionBackupInner>>() {
                  @Override
                  public Page<LongTermRetentionBackupInner> call(ServiceResponse<Page<LongTermRetentionBackupInner>> response) {
                      return response.body();
                  }
              });
      }
docs: Lists all long term retention backups for a database.
  
  @param locationName The location of the database
  @param longTermRetentionServerName the String value
  @param longTermRetentionDatabaseName the String value
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;LongTermRetentionBackupInner&gt; object