code: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   *
   */
  
  package org.apache.skywalking.oap.server.storage.plugin.elasticsearch.query;
  
  import org.apache.skywalking.library.elasticsearch.requests.search.BoolQueryBuilder;
  import org.apache.skywalking.library.elasticsearch.requests.search.Query;
  import org.apache.skywalking.library.elasticsearch.requests.search.Search;
  import org.apache.skywalking.library.elasticsearch.requests.search.SearchBuilder;
  import org.apache.skywalking.library.elasticsearch.requests.search.Sort;
  import org.apache.skywalking.library.elasticsearch.response.search.SearchHit;
  import org.apache.skywalking.library.elasticsearch.response.search.SearchResponse;
  import org.apache.skywalking.oap.server.core.analysis.topn.TopN;
  import org.apache.skywalking.oap.server.core.query.enumeration.Order;
  import org.apache.skywalking.oap.server.core.query.input.Duration;
  import org.apache.skywalking.oap.server.core.query.input.RecordCondition;
  import org.apache.skywalking.oap.server.core.query.type.Record;
  import org.apache.skywalking.oap.server.core.storage.query.IRecordsQueryDAO;
  import org.apache.skywalking.oap.server.library.client.elasticsearch.ElasticSearchClient;
  import org.apache.skywalking.oap.server.library.util.StringUtil;
  import org.apache.skywalking.oap.server.storage.plugin.elasticsearch.base.EsDAO;
  import org.apache.skywalking.oap.server.storage.plugin.elasticsearch.base.IndexController;
  
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  
  public class RecordsQueryEsDAO extends EsDAO implements IRecordsQueryDAO {
      public RecordsQueryEsDAO(ElasticSearchClient client) {
          super(client);
      }
  
      @Override
      public List<Record> readRecords(final RecordCondition condition,
                                             final String valueColumnName,
                                             final Duration duration) throws IOException {
          final BoolQueryBuilder query =
              Query.bool()
                   .must(Query.range(TopN.TIME_BUCKET)
                              .gte(duration.getStartTimeBucketInSec())
                              .lte(duration.getEndTimeBucketInSec()));
          if (IndexController.LogicIndicesRegister.isMergedTable(condition.getName())) {
              query.must(Query.term(IndexController.LogicIndicesRegister.RECORD_TABLE_NAME, condition.getName()));
          }
          query.must(Query.term(TopN.ENTITY_ID, condition.getParentEntity().buildId()));
  
          final SearchBuilder search =
              Search.builder()
                    .query(query)
                    .size(condition.getTopN())
                    .sort(
                        valueColumnName,
                        condition.getOrder().equals(Order.DES) ?
                            Sort.Order.DESC : Sort.Order.ASC
                    );
          final SearchResponse response = getClient().search(
              IndexController.LogicIndicesRegister.getPhysicalTableName(condition.getName()),
              search.build()
          );
  
          List<Record> results = new ArrayList<>(condition.getTopN());
  
          for (SearchHit searchHit : response.getHits().getHits()) {
              Record record = new Record();
              final Map<String, Object> sourceAsMap = searchHit.getSource();
              record.setName((String) sourceAsMap.get(TopN.STATEMENT));
              final String refId = (String) sourceAsMap.get(TopN.TRACE_ID);
              record.setRefId(StringUtil.isEmpty(refId) ? "" : refId);
              record.setId(record.getRefId());
              record.setValue(sourceAsMap.getOrDefault(valueColumnName, "0").toString());
              results.add(record);
          }
  
          return results;
      }
  }
  