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.csp.sentinel.command.handler.cluster;
  
  import com.alibaba.csp.sentinel.cluster.ClusterStateManager;
  import com.alibaba.csp.sentinel.cluster.client.TokenClientProvider;
  import com.alibaba.csp.sentinel.cluster.server.EmbeddedClusterTokenServerProvider;
  import com.alibaba.csp.sentinel.command.CommandHandler;
  import com.alibaba.csp.sentinel.command.CommandRequest;
  import com.alibaba.csp.sentinel.command.CommandResponse;
  import com.alibaba.csp.sentinel.command.annotation.CommandMapping;
  import com.alibaba.fastjson.JSONObject;
  
  /**
   * @author Eric Zhao
   * @since 1.4.0
   */
  @CommandMapping(name = "getClusterMode", desc = "get cluster mode status")
  public class FetchClusterModeCommandHandler implements CommandHandler<String> {
  
      @Override
      public CommandResponse<String> handle(CommandRequest request) {
          JSONObject res = new JSONObject()
              .fluentPut("mode", ClusterStateManager.getMode())
              .fluentPut("lastModified", ClusterStateManager.getLastModified())
              .fluentPut("clientAvailable", isClusterClientSpiAvailable())
              .fluentPut("serverAvailable", isClusterServerSpiAvailable());
          return CommandResponse.ofSuccess(res.toJSONString());
      }
  
      private boolean isClusterClientSpiAvailable() {
          return TokenClientProvider.getClient() != null;
      }
  
      private boolean isClusterServerSpiAvailable() {
          return EmbeddedClusterTokenServerProvider.getServer() != null;
      }
  }
  