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.query.graphql.resolver;
  
  import graphql.kickstart.tools.GraphQLQueryResolver;
  import java.util.Collections;
  import org.apache.skywalking.oap.server.core.CoreModule;
  import org.apache.skywalking.oap.server.core.query.RecordQueryService;
  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.library.module.ModuleManager;
  
  import java.io.IOException;
  import java.util.List;
  
  public class RecordsQuery implements GraphQLQueryResolver {
      private ModuleManager moduleManager;
      private RecordQueryService recordQueryService;
  
      public RecordsQuery(ModuleManager moduleManager) {
          this.moduleManager = moduleManager;
      }
  
      private RecordQueryService getRecordQueryService() {
          if (recordQueryService == null) {
              recordQueryService = moduleManager.find(CoreModule.NAME)
                  .provider()
                  .getService(RecordQueryService.class);
          }
          return recordQueryService;
      }
  
      public List<Record> readRecords(RecordCondition condition, Duration duration) throws IOException {
          if (!condition.senseScope() || !condition.getParentEntity().isValid()) {
              return Collections.emptyList();
          }
          return getRecordQueryService().readRecords(condition, duration);
      }
  }
  