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.jdbc.common.dao;
  
  import lombok.RequiredArgsConstructor;
  import lombok.SneakyThrows;
  import org.apache.skywalking.oap.server.core.analysis.manual.searchtag.TagAutocompleteData;
  import org.apache.skywalking.oap.server.core.analysis.manual.searchtag.TagType;
  import org.apache.skywalking.oap.server.core.query.input.Duration;
  import org.apache.skywalking.oap.server.core.storage.query.ITagAutoCompleteQueryDAO;
  import org.apache.skywalking.oap.server.library.client.jdbc.hikaricp.JDBCClient;
  import org.apache.skywalking.oap.server.storage.plugin.jdbc.common.SQLAndParameters;
  import org.apache.skywalking.oap.server.storage.plugin.jdbc.common.TableHelper;
  
  import java.util.ArrayList;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Set;
  
  import static java.util.Objects.nonNull;
  
  @RequiredArgsConstructor
  public class JDBCTagAutoCompleteQueryDAO implements ITagAutoCompleteQueryDAO {
      private final JDBCClient jdbcClient;
      private final TableHelper tableHelper;
  
      @Override
      @SneakyThrows
      public Set<String> queryTagAutocompleteKeys(final TagType tagType,
                                                  final int limit,
                                                  final Duration duration) {
          final var tables = tableHelper.getTablesForRead(
              TagAutocompleteData.INDEX_NAME,
              duration.getStartTimeBucket(),
              duration.getEndTimeBucket()
          );
          final var results = new HashSet<String>();
  
          for (String table : tables) {
              final var sqlAndParameters = buildSQLForQueryKeys(tagType, limit, duration, table);
              jdbcClient.executeQuery(
                  sqlAndParameters.sql(),
                  resultSet -> {
                      while (resultSet.next()) {
                          results.add(resultSet.getString(TagAutocompleteData.TAG_KEY));
                      }
                      return null;
                  },
                  sqlAndParameters.parameters());
          }
          return results;
      }
  
      protected SQLAndParameters buildSQLForQueryKeys(TagType tagType, int limit, Duration duration, String table) {
          StringBuilder sql = new StringBuilder();
          List<Object> condition = new ArrayList<>(2);
  
          sql.append("select distinct ").append(TagAutocompleteData.TAG_KEY).append(" from ")
             .append(table).append(" where ");
          sql.append(" 1=1 ");
          appendTagAutocompleteCondition(tagType, duration, sql, condition);
          sql.append(" limit ").append(limit);
  
          return new SQLAndParameters(sql.toString(), condition);
      }
  
      @Override
      @SneakyThrows
      public Set<String> queryTagAutocompleteValues(final TagType tagType,
                                                    final String tagKey,
                                                    final int limit,
                                                    final Duration duration) {
          final var tables = tableHelper.getTablesForRead(
              TagAutocompleteData.INDEX_NAME,
              duration.getStartTimeBucket(),
              duration.getEndTimeBucket()
          );
          final var results = new HashSet<String>();
  
          for (String table : tables) {
              final var sqlAndParameters = buildSQLForQueryValues(tagType, tagKey, limit, duration, table);
              jdbcClient.executeQuery(
                  sqlAndParameters.sql(),
                  resultSet -> {
                      while (resultSet.next()) {
                          results.add(resultSet.getString(TagAutocompleteData.TAG_VALUE));
                      }
                      return null;
                  },
                  sqlAndParameters.parameters()
              );
          }
          return results;
      }
  
      protected SQLAndParameters buildSQLForQueryValues(TagType tagType, String tagKey, int limit, Duration duration, String table) {
          StringBuilder sql = new StringBuilder();
          List<Object> condition = new ArrayList<>(3);
          sql.append("select * from ").append(table).append(" where ");
          sql.append(TagAutocompleteData.TAG_KEY).append(" = ?");
          condition.add(tagKey);
          appendTagAutocompleteCondition(tagType, duration, sql, condition);
          sql.append(" limit ").append(limit);
  
          return new SQLAndParameters(sql.toString(), condition);
      }
  
      private void appendTagAutocompleteCondition(final TagType tagType,
                                                  final Duration duration,
                                                  final StringBuilder sql,
                                                  final List<Object> condition) {
          long startSecondTB = 0;
          long endSecondTB = 0;
          if (nonNull(duration)) {
              startSecondTB = duration.getStartTimeBucketInSec();
              endSecondTB = duration.getEndTimeBucketInSec();
          }
  
          long startTB = startSecondTB / 1000000 * 10000;
          long endTB = endSecondTB / 1000000 * 10000 + 2359;
  
          sql.append(" and ");
          sql.append(TagAutocompleteData.TAG_TYPE).append(" = ?");
          condition.add(tagType.name());
  
          if (startTB > 0) {
              sql.append(" and ");
              sql.append(TagAutocompleteData.TIME_BUCKET).append(">=?");
              condition.add(startTB);
          }
          if (endTB > 0) {
              sql.append(" and ");
              sql.append(TagAutocompleteData.TIME_BUCKET).append("<=?");
              condition.add(endTB);
          }
      }
  }
  