content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * Licensed 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 com.alibaba.nacos.naming.push;
  
  import com.alibaba.nacos.api.naming.utils.NamingUtils;
  import com.alibaba.nacos.common.notify.Event;
  import com.alibaba.nacos.common.notify.NotifyCenter;
  import com.alibaba.nacos.common.notify.listener.SmartSubscriber;
  import com.alibaba.nacos.naming.core.v2.event.service.ServiceEvent;
  import com.alibaba.nacos.naming.core.v2.index.NamingFuzzyWatchContextService;
  import com.alibaba.nacos.naming.misc.Loggers;
  import com.alibaba.nacos.naming.push.v2.PushConfig;
  import com.alibaba.nacos.naming.push.v2.task.FuzzyWatchChangeNotifyTask;
  import com.alibaba.nacos.naming.push.v2.task.FuzzyWatchPushDelayTaskEngine;
  import org.springframework.stereotype.Service;
  
  import java.util.LinkedList;
  import java.util.List;
  import java.util.Set;
  
  /**
   * service change notify for fuzzy watch.
   *
   * @author shiyiyue
   */
  @Service
  public class NamingFuzzyWatchChangeNotifier extends SmartSubscriber {
      
      private NamingFuzzyWatchContextService namingFuzzyWatchContextService;
      
      private FuzzyWatchPushDelayTaskEngine fuzzyWatchPushDelayTaskEngine;
      
      public NamingFuzzyWatchChangeNotifier(NamingFuzzyWatchContextService namingFuzzyWatchContextService,
              FuzzyWatchPushDelayTaskEngine fuzzyWatchPushDelayTaskEngine) {
          this.fuzzyWatchPushDelayTaskEngine = fuzzyWatchPushDelayTaskEngine;
          this.namingFuzzyWatchContextService = namingFuzzyWatchContextService;
          NotifyCenter.registerSubscriber(this);
      }
      
      @Override
      public List<Class<? extends Event>> subscribeTypes() {
          List<Class<? extends Event>> result = new LinkedList<>();
          result.add(ServiceEvent.ServiceChangedEvent.class);
          return result;
      }
      
      @Override
      public void onEvent(Event event) {
          if (event instanceof ServiceEvent.ServiceChangedEvent) {
              ServiceEvent.ServiceChangedEvent serviceChangedEvent = (ServiceEvent.ServiceChangedEvent) event;
              if (namingFuzzyWatchContextService.syncServiceContext(serviceChangedEvent.getService(),
                      serviceChangedEvent.getChangedType())) {
                  generateFuzzyWatchChangeNotifyTask(serviceChangedEvent.getService(),
                          serviceChangedEvent.getChangedType());
              }
          }
      }
      
      private void generateFuzzyWatchChangeNotifyTask(com.alibaba.nacos.naming.core.v2.pojo.Service service,
              String changedType) {
          
          String serviceKey = NamingUtils.getServiceKey(service.getNamespace(), service.getGroup(), service.getName());
          Set<String> fuzzyWatchedClients = namingFuzzyWatchContextService.getFuzzyWatchedClients(service);
          
          Loggers.SRV_LOG.info("FUZZY_WATCH:serviceKey {}   has {} clients  fuzzy watched", serviceKey,
                  fuzzyWatchedClients == null ? 0 : fuzzyWatchedClients.size());
          // watch notify push task specify by service
          for (String clientId : fuzzyWatchedClients) {
              FuzzyWatchChangeNotifyTask fuzzyWatchChangeNotifyTask = new FuzzyWatchChangeNotifyTask(serviceKey,
                      changedType, clientId, PushConfig.getInstance().getPushTaskDelay());
              fuzzyWatchPushDelayTaskEngine.addTask(FuzzyWatchPushDelayTaskEngine.getTaskKey(fuzzyWatchChangeNotifyTask),
                      fuzzyWatchChangeNotifyTask);
          }
      }
      
  }
  