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.core.query;
  
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.List;
  import org.apache.skywalking.oap.server.library.util.StringUtil;
  import org.apache.skywalking.oap.server.core.Const;
  import org.apache.skywalking.oap.server.core.analysis.IDManager;
  import org.apache.skywalking.oap.server.core.analysis.manual.instance.InstanceTraffic;
  import org.apache.skywalking.oap.server.core.query.input.Duration;
  import org.apache.skywalking.oap.server.core.query.input.TopNCondition;
  import org.apache.skywalking.oap.server.core.query.type.KeyValue;
  import org.apache.skywalking.oap.server.core.query.type.SelectedRecord;
  import org.apache.skywalking.oap.server.core.storage.StorageModule;
  import org.apache.skywalking.oap.server.core.storage.annotation.ValueColumnMetadata;
  import org.apache.skywalking.oap.server.core.storage.query.IAggregationQueryDAO;
  import org.apache.skywalking.oap.server.library.module.ModuleManager;
  import org.apache.skywalking.oap.server.library.module.Service;
  
  public class AggregationQueryService implements Service {
      private final ModuleManager moduleManager;
      private IAggregationQueryDAO aggregationQueryDAO;
  
      public AggregationQueryService(ModuleManager moduleManager) {
          this.moduleManager = moduleManager;
      }
  
      private IAggregationQueryDAO getAggregationQueryDAO() {
          if (aggregationQueryDAO == null) {
              aggregationQueryDAO = moduleManager.find(StorageModule.NAME)
                                                 .provider()
                                                 .getService(IAggregationQueryDAO.class);
          }
          return aggregationQueryDAO;
      }
  
      public List<SelectedRecord> sortMetrics(TopNCondition condition, Duration duration) throws IOException {
          final String valueCName = ValueColumnMetadata.INSTANCE.getValueCName(condition.getName());
          List<KeyValue> additionalConditions = null;
          if (StringUtil.isNotEmpty(condition.getParentService())) {
              additionalConditions = new ArrayList<>(1);
              final String serviceId = IDManager.ServiceID.buildId(condition.getParentService(), condition.isNormal());
              additionalConditions.add(new KeyValue(InstanceTraffic.SERVICE_ID, serviceId));
          }
          final List<SelectedRecord> selectedRecords = getAggregationQueryDAO().sortMetrics(
              condition, valueCName, duration, additionalConditions);
          selectedRecords.forEach(selectedRecord -> {
              switch (condition.getScope()) {
                  case Service:
                      selectedRecord.setName(IDManager.ServiceID.analysisId(selectedRecord.getId()).getName());
                      break;
                  case ServiceInstance:
                      final IDManager.ServiceInstanceID.InstanceIDDefinition instanceIDDefinition
                          = IDManager.ServiceInstanceID.analysisId(selectedRecord.getId());
                      /*
                       * Add the service name into the name if this is global top N.
                       */
                      if (StringUtil.isEmpty(condition.getParentService())) {
                          IDManager.ServiceID.ServiceIDDefinition serviceIDDefinition =
                              IDManager.ServiceID.analysisId(instanceIDDefinition.getServiceId());
                          selectedRecord.setName(serviceIDDefinition.getName() + " - " + instanceIDDefinition.getName());
                      } else {
                          selectedRecord.setName(instanceIDDefinition.getName());
                      }
                      break;
                  case Endpoint:
                      final IDManager.EndpointID.EndpointIDDefinition endpointIDDefinition
                          = IDManager.EndpointID.analysisId(selectedRecord.getId());
                      /*
                       * Add the service name into the name if this is global top N.
                       */
                      if (StringUtil.isEmpty(condition.getParentService())) {
                          IDManager.ServiceID.ServiceIDDefinition serviceIDDefinition =
                              IDManager.ServiceID.analysisId(endpointIDDefinition.getServiceId());
                          selectedRecord.setName(serviceIDDefinition.getName()
                                                     + " - " + endpointIDDefinition.getEndpointName());
                      } else {
                          selectedRecord.setName(endpointIDDefinition.getEndpointName());
                      }
                      break;
                  default:
                      selectedRecord.setName(Const.UNKNOWN);
              }
          });
          return selectedRecords;
      }
  }
  