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.process.ServiceLabelRecord;
  import org.apache.skywalking.oap.server.core.storage.profiling.ebpf.IServiceLabelDAO;
  import org.apache.skywalking.oap.server.library.client.jdbc.hikaricp.JDBCClient;
  import org.apache.skywalking.oap.server.storage.plugin.jdbc.common.JDBCTableInstaller;
  import org.apache.skywalking.oap.server.storage.plugin.jdbc.common.TableHelper;
  
  import java.sql.ResultSet;
  import java.sql.SQLException;
  import java.util.ArrayList;
  import java.util.List;
  
  @RequiredArgsConstructor
  public class JDBCServiceLabelQueryDAO implements IServiceLabelDAO {
      private final JDBCClient jdbcClient;
      private final TableHelper tableHelper;
  
      @Override
      @SneakyThrows
      public List<String> queryAllLabels(String serviceId) {
          final var tables = tableHelper.getTablesWithinTTL(ServiceLabelRecord.INDEX_NAME);
          final var results = new ArrayList<String>();
  
          for (String table : tables) {
              final StringBuilder sql = new StringBuilder();
              List<Object> condition = new ArrayList<>(1);
              sql.append("select " + ServiceLabelRecord.LABEL + " from ")
                 .append(table)
                 .append(" where ")
                 .append(JDBCTableInstaller.TABLE_COLUMN).append(" = ?")
                 .append(" and ").append(ServiceLabelRecord.SERVICE_ID).append(" = ?");
              condition.add(ServiceLabelRecord.INDEX_NAME);
              condition.add(serviceId);
  
              results.addAll(
                  jdbcClient.executeQuery(
                      sql.toString(),
                      this::parseLabels,
                      condition.toArray(new Object[0])
                  )
              );
          }
  
          return results;
      }
  
      private List<String> parseLabels(ResultSet resultSet) throws SQLException {
          final List<String> labels = new ArrayList<>();
          while (resultSet.next()) {
              labels.add(resultSet.getString(ServiceLabelRecord.LABEL));
          }
          return labels;
      }
  }
  