code: public Observable<ServiceResponse<Page<LongTermRetentionBackupInner>>> listByDatabaseSinglePageAsync(final String locationName, final String longTermRetentionServerName, final String longTermRetentionDatabaseName) {
          if (locationName == null) {
              throw new IllegalArgumentException("Parameter locationName is required and cannot be null.");
          }
          if (longTermRetentionServerName == null) {
              throw new IllegalArgumentException("Parameter longTermRetentionServerName is required and cannot be null.");
          }
          if (longTermRetentionDatabaseName == null) {
              throw new IllegalArgumentException("Parameter longTermRetentionDatabaseName is required and cannot be null.");
          }
          if (this.client.subscriptionId() == null) {
              throw new IllegalArgumentException("Parameter this.client.subscriptionId() is required and cannot be null.");
          }
          if (this.client.apiVersion() == null) {
              throw new IllegalArgumentException("Parameter this.client.apiVersion() is required and cannot be null.");
          }
          final Boolean onlyLatestPerDatabase = null;
          final LongTermRetentionDatabaseState databaseState = null;
          return service.listByDatabase(locationName, longTermRetentionServerName, longTermRetentionDatabaseName, this.client.subscriptionId(), onlyLatestPerDatabase, databaseState, this.client.apiVersion(), this.client.acceptLanguage(), this.client.userAgent())
              .flatMap(new Func1<Response<ResponseBody>, Observable<ServiceResponse<Page<LongTermRetentionBackupInner>>>>() {
                  @Override
                  public Observable<ServiceResponse<Page<LongTermRetentionBackupInner>>> call(Response<ResponseBody> response) {
                      try {
                          ServiceResponse<PageImpl<LongTermRetentionBackupInner>> result = listByDatabaseDelegate(response);
                          return Observable.just(new ServiceResponse<Page<LongTermRetentionBackupInner>>(result.body(), result.response()));
                      } catch (Throwable t) {
                          return Observable.error(t);
                      }
                  }
              });
      }
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 PagedList&lt;LongTermRetentionBackupInner&gt; object wrapped in {@link ServiceResponse} if successful.