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.csp.sentinel.log.RecordLog;
  
  /**
   * @author Eric Zhao
   * @since 1.4.0
   */
  @CommandMapping(name = "setClusterMode", desc = "set cluster mode, accept param: mode={0|1} 0:client mode 1:server mode")
  public class ModifyClusterModeCommandHandler implements CommandHandler<String> {
  
      @Override
      public CommandResponse<String> handle(CommandRequest request) {
          try {
              int mode = Integer.valueOf(request.getParam("mode"));
              if (mode == ClusterStateManager.CLUSTER_CLIENT && !TokenClientProvider.isClientSpiAvailable()) {
                  return CommandResponse.ofFailure(new IllegalStateException("token client mode not available: no SPI found"));
              }
              if (mode == ClusterStateManager.CLUSTER_SERVER && !isClusterServerSpiAvailable()) {
                  return CommandResponse.ofFailure(new IllegalStateException("token server mode not available: no SPI found"));
              }
              RecordLog.info("[ModifyClusterModeCommandHandler] Modifying cluster mode to: {}", mode);
  
              ClusterStateManager.applyState(mode);
              return CommandResponse.ofSuccess("success");
          } catch (NumberFormatException ex) {
              return CommandResponse.ofFailure(new IllegalArgumentException("invalid parameter"));
          } catch (Exception ex) {
              return CommandResponse.ofFailure(ex);
          }
      }
  
      private boolean isClusterServerSpiAvailable() {
          return EmbeddedClusterTokenServerProvider.isServerSpiAvailable();
      }
  }
  