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;
  
  import com.alibaba.nacos.naming.consistency.ConsistencyService;
  import com.alibaba.nacos.naming.misc.GlobalExecutor;
  import com.alibaba.nacos.naming.misc.SwitchDomain;
  import org.apache.commons.lang3.StringUtils;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.stereotype.Service;
  
  import javax.annotation.PostConstruct;
  import javax.annotation.Resource;
  
  /**
   * Detect and control the working status of local server
   *
   * @author nkorange
   * @since 1.0.0
   */
  @Service
  public class ServerStatusManager {
  
      @Resource(name = "consistencyDelegate")
      private ConsistencyService consistencyService;
  
      @Autowired
      private SwitchDomain switchDomain;
  
      private ServerStatus serverStatus = ServerStatus.STARTING;
  
      @PostConstruct
      public void init() {
          GlobalExecutor.registerServerStatusUpdater(new ServerStatusUpdater());
      }
  
      private void refreshServerStatus() {
  
          if (StringUtils.isNotBlank(switchDomain.getOverriddenServerStatus())) {
              serverStatus = ServerStatus.valueOf(switchDomain.getOverriddenServerStatus());
              return;
          }
  
          if (consistencyService.isAvailable()) {
              serverStatus = ServerStatus.UP;
          } else {
              serverStatus = ServerStatus.DOWN;
          }
      }
  
      public ServerStatus getServerStatus() {
          return serverStatus;
      }
  
      public class ServerStatusUpdater implements Runnable {
  
          @Override
          public void run() {
              refreshServerStatus();
          }
      }
  }
  