code: public Observable<Page<LongTermRetentionBackupInner>> listByLocationAsync(final String locationName, final Boolean onlyLatestPerDatabase, final LongTermRetentionDatabaseState databaseState) {
          return listByLocationWithServiceResponseAsync(locationName, onlyLatestPerDatabase, databaseState)
              .map(new Func1<ServiceResponse<Page<LongTermRetentionBackupInner>>, Page<LongTermRetentionBackupInner>>() {
                  @Override
                  public Page<LongTermRetentionBackupInner> call(ServiceResponse<Page<LongTermRetentionBackupInner>> response) {
                      return response.body();
                  }
              });
      }
docs: Lists the long term retention backups for a given location.
  
  @param locationName The location of the database
  @param onlyLatestPerDatabase Whether or not to only get the latest backup for each database.
  @param databaseState Whether to query against just live databases, just deleted databases, or all databases. Possible values include: 'All', 'Live', 'Deleted'
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;LongTermRetentionBackupInner&gt; object