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.io.IOException;
  import java.text.SimpleDateFormat;
  import java.util.Date;
  import java.util.List;
  import java.util.Set;
  import org.apache.skywalking.oap.query.graphql.type.TimeInfo;
  import org.apache.skywalking.oap.server.core.CoreModule;
  import org.apache.skywalking.oap.server.core.analysis.IDManager;
  import org.apache.skywalking.oap.server.core.query.MetadataQueryService;
  import org.apache.skywalking.oap.server.core.query.input.Duration;
  import org.apache.skywalking.oap.server.core.query.type.Endpoint;
  import org.apache.skywalking.oap.server.core.query.type.EndpointInfo;
  import org.apache.skywalking.oap.server.core.query.type.Process;
  import org.apache.skywalking.oap.server.core.query.type.Service;
  import org.apache.skywalking.oap.server.core.query.type.ServiceInstance;
  import org.apache.skywalking.oap.server.library.module.ModuleManager;
  
  /**
   * Metadata v2 query protocol implementation.
   *
   * @since 9.0.0
   */
  public class MetadataQueryV2 implements GraphQLQueryResolver {
  
      private final ModuleManager moduleManager;
      private MetadataQueryService metadataQueryService;
  
      public MetadataQueryV2(ModuleManager moduleManager) {
          this.moduleManager = moduleManager;
      }
  
      private MetadataQueryService getMetadataQueryService() {
          if (metadataQueryService == null) {
              this.metadataQueryService = moduleManager.find(CoreModule.NAME)
                                                       .provider()
                                                       .getService(MetadataQueryService.class);
          }
          return metadataQueryService;
      }
  
      public Set<String> listLayers() throws IOException {
          return getMetadataQueryService().listLayers();
      }
  
      public List<Service> listServices(final String layer) throws IOException {
          return getMetadataQueryService().listServices(layer, null);
      }
  
      public Service findService(final String serviceName) throws IOException {
          return getMetadataQueryService().getService(IDManager.ServiceID.buildId(serviceName, true));
      }
  
      public Service getService(final String serviceId) throws IOException {
          return getMetadataQueryService().getService(serviceId);
      }
  
      public List<ServiceInstance> listInstances(final Duration duration,
                                                 final String serviceId) throws IOException {
          return getMetadataQueryService().listInstances(duration, serviceId);
      }
  
      public ServiceInstance getInstance(final String instanceId) throws IOException {
          return getMetadataQueryService().getInstance(instanceId);
      }
  
      public List<Endpoint> findEndpoint(final String keyword, final String serviceId,
                                         final int limit) throws IOException {
          return getMetadataQueryService().findEndpoint(keyword, serviceId, limit);
      }
  
      public EndpointInfo getEndpointInfo(final String endpointId) throws IOException {
          return getMetadataQueryService().getEndpointInfo(endpointId);
      }
  
      public List<Process> listProcesses(final Duration duration, final String instanceId) throws IOException {
          return getMetadataQueryService().listProcesses(duration, instanceId);
      }
  
      public Process getProcess(final String processId) throws IOException {
          return getMetadataQueryService().getProcess(processId);
      }
  
      public Long estimateProcessScale(String serviceId, List<String> labels) throws IOException {
          return getMetadataQueryService().estimateProcessScale(serviceId, labels);
      }
  
      public TimeInfo getTimeInfo() {
          TimeInfo timeInfo = new TimeInfo();
          SimpleDateFormat timezoneFormat = new SimpleDateFormat("ZZZZZZ");
          Date date = new Date();
          timeInfo.setCurrentTimestamp(date.getTime());
          timeInfo.setTimezone(timezoneFormat.format(date));
          return timeInfo;
      }
  }
  