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.consistency;
  
  import com.alibaba.nacos.api.exception.NacosException;
  import com.alibaba.nacos.naming.consistency.ephemeral.EphemeralConsistencyService;
  import com.alibaba.nacos.naming.consistency.persistent.PersistentConsistencyService;
  import com.alibaba.nacos.naming.pojo.Record;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.stereotype.Service;
  
  /**
   * Consistency delegate
   *
   * @author nkorange
   * @since 1.0.0
   */
  @Service("consistencyDelegate")
  public class DelegateConsistencyServiceImpl implements ConsistencyService {
  
      @Autowired
      private PersistentConsistencyService persistentConsistencyService;
  
      @Autowired
      private EphemeralConsistencyService ephemeralConsistencyService;
  
      @Override
      public void put(String key, Record value) throws NacosException {
          mapConsistencyService(key).put(key, value);
      }
  
      @Override
      public void remove(String key) throws NacosException {
          mapConsistencyService(key).remove(key);
      }
  
      @Override
      public Datum get(String key) throws NacosException {
          return mapConsistencyService(key).get(key);
      }
  
      @Override
      public void listen(String key, RecordListener listener) throws NacosException {
  
          // this special key is listened by both:
          if (KeyBuilder.SERVICE_META_KEY_PREFIX.equals(key)) {
              persistentConsistencyService.listen(key, listener);
              ephemeralConsistencyService.listen(key, listener);
              return;
          }
  
          mapConsistencyService(key).listen(key, listener);
      }
  
      @Override
      public void unlisten(String key, RecordListener listener) throws NacosException {
          mapConsistencyService(key).unlisten(key, listener);
      }
  
      @Override
      public boolean isAvailable() {
          return ephemeralConsistencyService.isAvailable() && persistentConsistencyService.isAvailable();
      }
  
      private ConsistencyService mapConsistencyService(String key) {
          return KeyBuilder.matchEphemeralKey(key) ? ephemeralConsistencyService : persistentConsistencyService;
      }
  }
  