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.cluster.servers;
  
  import java.util.List;
  
  /**
   * Nacos cluster member change event listener
   *
   * @author nkorange
   * @since 1.0.0
   */
  public interface ServerChangeListener {
  
      /**
       * If member list changed, this method is invoked.
       *
       * @param servers servers after change
       */
      void onChangeServerList(List<Server> servers);
  
      /**
       * If reachable member list changed, this method is invoked.
       *
       * @param healthyServer reachable servers after change
       */
      void onChangeHealthyServerList(List<Server> healthyServer);
  }
  