content: /*
   * Copyright 1999-2020 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.core.remote.core;
  
  import com.alibaba.nacos.api.exception.NacosException;
  import com.alibaba.nacos.api.remote.RemoteConstants;
  import com.alibaba.nacos.api.remote.request.RequestMeta;
  import com.alibaba.nacos.api.remote.request.ServerReloadRequest;
  import com.alibaba.nacos.api.remote.response.ServerReloadResponse;
  import com.alibaba.nacos.auth.annotation.Secured;
  import com.alibaba.nacos.core.remote.ConnectionManager;
  import com.alibaba.nacos.core.remote.RequestHandler;
  import com.alibaba.nacos.core.remote.grpc.InvokeSource;
  import com.alibaba.nacos.core.utils.Loggers;
  import com.alibaba.nacos.core.utils.RemoteUtils;
  import com.alibaba.nacos.plugin.auth.constant.ApiType;
  import com.alibaba.nacos.plugin.auth.constant.SignType;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.stereotype.Component;
  
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * server reload request handler.
   *
   * @author liuzunfei
   * @version $Id: ServerReloaderRequestHandler.java, v 0.1 2020年11月09日 4:38 PM liuzunfei Exp $
   */
  @InvokeSource(source = {RemoteConstants.LABEL_SOURCE_CLUSTER})
  @Component
  public class ServerReloaderRequestHandler extends RequestHandler<ServerReloadRequest, ServerReloadResponse> {
      
      @Autowired
      private ConnectionManager connectionManager;
      
      @Override
      @Secured(resource = "serverReload", signType = SignType.SPECIFIED, apiType = ApiType.INNER_API)
      public ServerReloadResponse handle(ServerReloadRequest request, RequestMeta meta) throws NacosException {
          ServerReloadResponse response = new ServerReloadResponse();
          Loggers.REMOTE.info("server reload request receive,reload count={},redirectServer={},requestIp={}",
                  request.getReloadCount(), request.getReloadServer(), meta.getClientIp());
          int reloadCount = request.getReloadCount();
          Map<String, String> filter = new HashMap<>(2);
          filter.put(RemoteConstants.LABEL_SOURCE, RemoteConstants.LABEL_SOURCE_SDK);
          int sdkCount = connectionManager.currentClientsCount(filter);
          if (sdkCount <= reloadCount) {
              response.setMessage("ignore");
          } else {
              reloadCount = (int) Math.max(reloadCount, sdkCount * (1 - RemoteUtils.LOADER_FACTOR));
              connectionManager.loadCount(reloadCount, request.getReloadServer());
              response.setMessage("ok");
          }
          return response;
      }
  }
  