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.analyzer.provider.trace.parser.listener;
  
  import lombok.RequiredArgsConstructor;
  import lombok.extern.slf4j.Slf4j;
  import org.apache.skywalking.apm.network.language.agent.v3.RefType;
  import org.apache.skywalking.apm.network.language.agent.v3.SegmentObject;
  import org.apache.skywalking.apm.network.language.agent.v3.SpanLayer;
  import org.apache.skywalking.apm.network.language.agent.v3.SpanObject;
  import org.apache.skywalking.oap.server.core.CoreModule;
  import org.apache.skywalking.oap.server.core.analysis.TimeBucket;
  import org.apache.skywalking.oap.server.core.config.NamingControl;
  import org.apache.skywalking.oap.server.core.source.NetworkAddressAliasSetup;
  import org.apache.skywalking.oap.server.core.source.SourceReceiver;
  import org.apache.skywalking.oap.server.library.module.ModuleManager;
  import org.apache.skywalking.oap.server.analyzer.provider.AnalyzerModuleConfig;
  
  /**
   * NetworkAddressAliasMappingListener use the propagated data in the segment reference, set up the alias relationship
   * between network address and current service and instance. The alias relationship will be used in the {@link
   * RPCAnalysisListener#parseExit(SpanObject, SegmentObject)} to setup the accurate target destination service
   * and instance.
   *
   * This is a key point of SkyWalking header propagation protocol.
   */
  @Slf4j
  @RequiredArgsConstructor
  public class NetworkAddressAliasMappingListener implements EntryAnalysisListener {
      private final SourceReceiver sourceReceiver;
      private final AnalyzerModuleConfig config;
      private final NamingControl namingControl;
  
      @Override
      public void parseEntry(SpanObject span, SegmentObject segmentObject) {
          if (span.getSkipAnalysis()) {
              return;
          }
          if (log.isDebugEnabled()) {
              log.debug("service instance mapping listener parse reference");
          }
          if (!span.getSpanLayer().equals(SpanLayer.MQ)) {
              span.getRefsList().forEach(segmentReference -> {
                  if (RefType.CrossProcess.equals(segmentReference.getRefType())) {
                      final String networkAddressUsedAtPeer = namingControl.formatServiceName(
                          segmentReference.getNetworkAddressUsedAtPeer());
                      if (config.getUninstrumentedGatewaysConfig().isAddressConfiguredAsGateway(
                          networkAddressUsedAtPeer)) {
                          /*
                           * If this network address has been set as an uninstrumented gateway, no alias should be set.
                           */
                          return;
                      }
                      final String serviceName = namingControl.formatServiceName(segmentObject.getService());
                      final String instanceName = namingControl.formatInstanceName(
                          segmentObject.getServiceInstance());
  
                      final NetworkAddressAliasSetup networkAddressAliasSetup = new NetworkAddressAliasSetup();
                      networkAddressAliasSetup.setAddress(networkAddressUsedAtPeer);
                      networkAddressAliasSetup.setRepresentService(serviceName);
                      networkAddressAliasSetup.setRepresentServiceNormal(true);
                      networkAddressAliasSetup.setRepresentServiceInstance(instanceName);
                      networkAddressAliasSetup.setTimeBucket(TimeBucket.getMinuteTimeBucket(span.getStartTime()));
  
                      sourceReceiver.receive(networkAddressAliasSetup);
                  }
  
              });
          }
      }
  
      @Override
      public void build() {
      }
  
      @Override
      public boolean containsPoint(Point point) {
          return Point.Entry.equals(point);
      }
  
      public static class Factory implements AnalysisListenerFactory {
          private final SourceReceiver sourceReceiver;
          private final NamingControl namingControl;
  
          public Factory(ModuleManager moduleManager) {
              this.sourceReceiver = moduleManager.find(CoreModule.NAME).provider().getService(SourceReceiver.class);
              this.namingControl = moduleManager.find(CoreModule.NAME)
                                                .provider()
                                                .getService(NamingControl.class);
          }
  
          @Override
          public AnalysisListener create(ModuleManager moduleManager, AnalyzerModuleConfig config) {
              return new NetworkAddressAliasMappingListener(sourceReceiver, config, namingControl);
          }
      }
  }
  