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.core.v2.service;
  
  import com.alibaba.nacos.api.exception.NacosException;
  import com.alibaba.nacos.api.naming.pojo.Instance;
  import com.alibaba.nacos.naming.core.v2.ServiceManager;
  import com.alibaba.nacos.naming.core.v2.pojo.Service;
  import com.alibaba.nacos.naming.core.v2.service.impl.EphemeralClientOperationServiceImpl;
  import com.alibaba.nacos.naming.core.v2.service.impl.PersistentClientOperationServiceImpl;
  import com.alibaba.nacos.naming.misc.Loggers;
  import com.alibaba.nacos.naming.pojo.Subscriber;
  import org.springframework.context.annotation.DependsOn;
  import org.springframework.stereotype.Component;
  
  import java.util.List;
  
  /**
   * Implementation of external exposure.
   *
   * <p>Depends on {@link com.alibaba.nacos.naming.push.v2.NamingSubscriberServiceV2Impl namingSubscriberServiceV2Impl}
   * having listen on related {@link com.alibaba.nacos.naming.core.v2.event.service.ServiceEvent.ServiceChangedEvent events}.
   * @author <a href="mailto:liaochuntao@live.com">liaochuntao</a>
   */
  @DependsOn("namingSubscriberServiceV2Impl")
  @SuppressWarnings("PMD.ServiceOrDaoClassShouldEndWithImplRule")
  @Component
  public class ClientOperationServiceProxy implements ClientOperationService {
      
      private final ClientOperationService ephemeralClientOperationService;
      
      private final ClientOperationService persistentClientOperationService;
      
      public ClientOperationServiceProxy(EphemeralClientOperationServiceImpl ephemeralClientOperationService,
              PersistentClientOperationServiceImpl persistentClientOperationService) {
          this.ephemeralClientOperationService = ephemeralClientOperationService;
          this.persistentClientOperationService = persistentClientOperationService;
      }
      
      @Override
      public void registerInstance(Service service, Instance instance, String clientId) throws NacosException {
          final ClientOperationService operationService = chooseClientOperationService(instance);
          operationService.registerInstance(service, instance, clientId);
      }
      
      @Override
      public void batchRegisterInstance(Service service, List<Instance> instances, String clientId) {
          final ClientOperationService operationService = chooseClientOperationService(instances.get(0));
          operationService.batchRegisterInstance(service, instances, clientId);
      }
      
      @Override
      public void deregisterInstance(Service service, Instance instance, String clientId) {
          if (!ServiceManager.getInstance().containSingleton(service)) {
              Loggers.SRV_LOG.warn("remove instance from non-exist service: {}", service);
              return;
          }
          final ClientOperationService operationService = chooseClientOperationService(instance);
          operationService.deregisterInstance(service, instance, clientId);
      }
      
      @Override
      public void subscribeService(Service service, Subscriber subscriber, String clientId) {
          // Subscriber is an ephemeral type only, so call ephemeral client directly
          ephemeralClientOperationService.subscribeService(service, subscriber, clientId);
      }
      
      @Override
      public void unsubscribeService(Service service, Subscriber subscriber, String clientId) {
          // Subscriber is an ephemeral type only, so call ephemeral client directly
          ephemeralClientOperationService.unsubscribeService(service, subscriber, clientId);
      }
      
      private ClientOperationService chooseClientOperationService(final Instance instance) {
          return instance.isEphemeral() ? ephemeralClientOperationService : persistentClientOperationService;
      }
  }
  