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.client.naming.remote.gprc;
  
  import com.alibaba.nacos.api.common.Constants;
  import com.alibaba.nacos.api.naming.remote.request.NamingFuzzyWatchChangeNotifyRequest;
  import com.alibaba.nacos.api.naming.remote.request.NamingFuzzyWatchSyncRequest;
  import com.alibaba.nacos.api.naming.remote.response.NamingFuzzyWatchChangeNotifyResponse;
  import com.alibaba.nacos.api.naming.utils.NamingUtils;
  import com.alibaba.nacos.api.remote.request.Request;
  import com.alibaba.nacos.api.remote.response.Response;
  import com.alibaba.nacos.client.naming.cache.NamingFuzzyWatchContext;
  import com.alibaba.nacos.client.naming.cache.NamingFuzzyWatchServiceListHolder;
  import com.alibaba.nacos.client.naming.event.NamingFuzzyWatchNotifyEvent;
  import com.alibaba.nacos.common.notify.NotifyCenter;
  import com.alibaba.nacos.common.remote.client.Connection;
  import com.alibaba.nacos.common.remote.client.ServerRequestHandler;
  import com.alibaba.nacos.common.utils.FuzzyGroupKeyPattern;
  
  import java.util.Collection;
  
  import static com.alibaba.nacos.api.common.Constants.FUZZY_WATCH_RESOURCE_CHANGED;
  
  /**
   * handle fuzzy watch request from server.
   *
   * @author shiyiyue
   */
  public class NamingFuzzyWatchNotifyRequestHandler implements ServerRequestHandler {
      
      NamingFuzzyWatchServiceListHolder namingFuzzyWatchServiceListHolder;
      
      public NamingFuzzyWatchNotifyRequestHandler(NamingFuzzyWatchServiceListHolder namingFuzzyWatchServiceListHolder) {
          this.namingFuzzyWatchServiceListHolder = namingFuzzyWatchServiceListHolder;
          NotifyCenter.registerToPublisher(NamingFuzzyWatchNotifyEvent.class, 1000);
      }
      
      @Override
      public Response requestReply(Request request, Connection connection) {
          
          if (request instanceof NamingFuzzyWatchSyncRequest) {
              NamingFuzzyWatchSyncRequest watchNotifySyncRequest = (NamingFuzzyWatchSyncRequest) request;
              NamingFuzzyWatchContext namingFuzzyWatchContext = namingFuzzyWatchServiceListHolder.getFuzzyMatchContextMap()
                      .get(watchNotifySyncRequest.getGroupKeyPattern());
              if (namingFuzzyWatchContext != null) {
                  Collection<NamingFuzzyWatchSyncRequest.Context> serviceKeys = watchNotifySyncRequest.getContexts();
                  if (watchNotifySyncRequest.getSyncType().equals(Constants.FUZZY_WATCH_INIT_NOTIFY)
                          || watchNotifySyncRequest.getSyncType().equals(Constants.FUZZY_WATCH_DIFF_SYNC_NOTIFY)) {
                      for (NamingFuzzyWatchSyncRequest.Context serviceKey : serviceKeys) {
                          // may have a 'change event' sent to client before 'init event'
                          if (namingFuzzyWatchContext.addReceivedServiceKey(serviceKey.getServiceKey())) {
                              NotifyCenter.publishEvent(NamingFuzzyWatchNotifyEvent.build(
                                      namingFuzzyWatchServiceListHolder.getNotifierEventScope(),
                                      watchNotifySyncRequest.getGroupKeyPattern(), serviceKey.getServiceKey(),
                                      serviceKey.getChangedType(), watchNotifySyncRequest.getSyncType()));
                          }
                      }
                  } else if (watchNotifySyncRequest.getSyncType().equals(Constants.FINISH_FUZZY_WATCH_INIT_NOTIFY)) {
                      namingFuzzyWatchContext.markInitializationComplete();
                  }
              }
              
              return new NamingFuzzyWatchChangeNotifyResponse();
              
          } else if (request instanceof NamingFuzzyWatchChangeNotifyRequest) {
              NamingFuzzyWatchChangeNotifyRequest notifyChangeRequest = (NamingFuzzyWatchChangeNotifyRequest) request;
              String[] serviceKeyItems = NamingUtils.parseServiceKey(notifyChangeRequest.getServiceKey());
              String namespace = serviceKeyItems[0];
              String groupName = serviceKeyItems[1];
              String serviceName = serviceKeyItems[2];
              
              Collection<String> matchedPattern = FuzzyGroupKeyPattern.filterMatchedPatterns(
                      namingFuzzyWatchServiceListHolder.getFuzzyMatchContextMap().keySet(), serviceName, groupName,
                      namespace);
              String serviceChangeType = notifyChangeRequest.getChangedType();
              
              switch (serviceChangeType) {
                  case Constants.ServiceChangedType.ADD_SERVICE:
                  case Constants.ServiceChangedType.INSTANCE_CHANGED:
                      for (String pattern : matchedPattern) {
                          NamingFuzzyWatchContext namingFuzzyWatchContext = namingFuzzyWatchServiceListHolder.getFuzzyMatchContextMap()
                                  .get(pattern);
                          if (namingFuzzyWatchContext != null && namingFuzzyWatchContext.addReceivedServiceKey(
                                  ((NamingFuzzyWatchChangeNotifyRequest) request).getServiceKey())) {
                              //publish local service add event
                              NotifyCenter.publishEvent(NamingFuzzyWatchNotifyEvent.build(
                                      namingFuzzyWatchServiceListHolder.getNotifierEventScope(), pattern,
                                      notifyChangeRequest.getServiceKey(), Constants.ServiceChangedType.ADD_SERVICE,
                                      FUZZY_WATCH_RESOURCE_CHANGED));
                          }
                      }
                      break;
                  case Constants.ServiceChangedType.DELETE_SERVICE:
                      for (String pattern : matchedPattern) {
                          NamingFuzzyWatchContext namingFuzzyWatchContext = namingFuzzyWatchServiceListHolder.getFuzzyMatchContextMap()
                                  .get(pattern);
                          if (namingFuzzyWatchContext != null && namingFuzzyWatchContext.removeReceivedServiceKey(
                                  notifyChangeRequest.getServiceKey())) {
                              NotifyCenter.publishEvent(NamingFuzzyWatchNotifyEvent.build(
                                      namingFuzzyWatchServiceListHolder.getNotifierEventScope(), pattern,
                                      notifyChangeRequest.getServiceKey(), Constants.ServiceChangedType.DELETE_SERVICE,
                                      FUZZY_WATCH_RESOURCE_CHANGED));
                          }
                      }
                      break;
                  default:
                      break;
              }
              return new NamingFuzzyWatchChangeNotifyResponse();
          }
          return null;
      }
  }
  