content: /*
   * Copyright 1999-2020 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.model.Page;
  import com.alibaba.nacos.api.model.v2.Result;
  import com.alibaba.nacos.api.naming.CommonParams;
  import com.alibaba.nacos.api.naming.pojo.maintainer.SubscriberInfo;
  import com.alibaba.nacos.api.naming.utils.NamingUtils;
  import com.alibaba.nacos.common.model.RestResult;
  import com.alibaba.nacos.common.utils.JacksonUtils;
  import com.alibaba.nacos.core.cluster.Member;
  import com.alibaba.nacos.core.cluster.ServerMemberManager;
  import com.alibaba.nacos.naming.core.v2.pojo.Service;
  import com.alibaba.nacos.naming.misc.HttpClient;
  import com.alibaba.nacos.naming.misc.UtilsAndCommons;
  import com.alibaba.nacos.naming.pojo.Subscriber;
  import com.alibaba.nacos.sys.env.EnvUtil;
  import com.fasterxml.jackson.core.type.TypeReference;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.LinkedList;
  import java.util.Map;
  
  import static com.alibaba.nacos.common.constant.RequestUrlConstants.HTTP_PREFIX;
  
  /**
   * Aggregation naming subscriber service. Aggregate all implementation of {@link NamingSubscriberService} and
   * subscribers from other nodes.
   *
   * @author xiweng.yy
   */
  @org.springframework.stereotype.Service
  public class NamingSubscriberServiceAggregationImpl implements NamingSubscriberService {
      
      private static final String SUBSCRIBER_ON_SYNC_URL = "/subscribers";
      
      private final NamingSubscriberServiceLocalImpl subscriberServiceLocal;
      
      private final ServerMemberManager memberManager;
      
      public NamingSubscriberServiceAggregationImpl(NamingSubscriberServiceLocalImpl subscriberServiceLocal,
              ServerMemberManager serverMemberManager) {
          this.subscriberServiceLocal = subscriberServiceLocal;
          this.memberManager = serverMemberManager;
      }
      
      @Override
      public Collection<Subscriber> getSubscribers(String namespaceId, String serviceName) {
          Collection<Subscriber> result = new LinkedList<>(
                  subscriberServiceLocal.getSubscribers(namespaceId, serviceName));
          if (memberManager.getServerList().size() > 1) {
              getSubscribersFromRemotes(namespaceId, serviceName, result);
          }
          return result;
      }
      
      @Override
      public Collection<Subscriber> getSubscribers(Service service) {
          Collection<Subscriber> result = new LinkedList<>(subscriberServiceLocal.getSubscribers(service));
          if (memberManager.getServerList().size() > 1) {
              getSubscribersFromRemotes(service.getNamespace(), service.getGroupedServiceName(), result);
          }
          return result;
      }
      
      @Override
      public Collection<Subscriber> getFuzzySubscribers(String namespaceId, String serviceName) {
          Collection<Subscriber> result = new LinkedList<>(
                  subscriberServiceLocal.getFuzzySubscribers(namespaceId, serviceName));
          if (memberManager.getServerList().size() > 1) {
              getSubscribersFromRemotes(namespaceId, serviceName, result);
          }
          return result;
      }
      
      @Override
      public Collection<Subscriber> getFuzzySubscribers(Service service) {
          Collection<Subscriber> result = new LinkedList<>(subscriberServiceLocal.getFuzzySubscribers(service));
          if (memberManager.getServerList().size() > 1) {
              getSubscribersFromRemotes(service.getNamespace(), service.getGroupedServiceName(), result);
          }
          return result;
      }
      
      private void getSubscribersFromRemotes(String namespaceId, String serviceName, Collection<Subscriber> result) {
          for (Member server : memberManager.allMembersWithoutSelf()) {
              Map<String, String> paramValues = new HashMap<>(128);
              String groupName = NamingUtils.getGroupName(serviceName);
              String serviceNameWithoutGroup = NamingUtils.getServiceName(serviceName);
              paramValues.put(CommonParams.GROUP_NAME, groupName);
              paramValues.put(CommonParams.SERVICE_NAME, serviceNameWithoutGroup);
              paramValues.put(CommonParams.NAMESPACE_ID, namespaceId);
              paramValues.put("aggregation", String.valueOf(Boolean.FALSE));
              RestResult<String> response = HttpClient.httpGet(
                      HTTP_PREFIX + server.getAddress() + EnvUtil.getContextPath()
                              + UtilsAndCommons.SERVICE_CONTROLLER_V3_ADMIN_PATH + SUBSCRIBER_ON_SYNC_URL,
                      new ArrayList<>(), paramValues);
              if (response.ok()) {
                  Result<Page<SubscriberInfo>> subscribers = JacksonUtils.toObj(response.getData(),
                          new TypeReference<>() {
                          });
                  for (SubscriberInfo each : subscribers.getData().getPageItems()) {
                      result.add(new Subscriber(each.getAddress(), each.getAgent(), each.getAppName(), each.getIp(),
                              each.getNamespaceId(), serviceName, each.getPort()));
                  }
              }
          }
      }
  }
  