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.api.remote;
  
  import com.alibaba.nacos.api.exception.NacosException;
  import com.alibaba.nacos.api.remote.request.Request;
  import com.alibaba.nacos.api.remote.response.Response;
  
  /**
   * connection interface,define basic operation.
   *
   * @author liuzunfei
   * @version $Id: Requester.java, v 0.1 2020年09月11日 4:05 PM liuzunfei Exp $
   */
  public interface Requester {
      
      /**
       * send request.
       *
       * @param request      request.
       * @param timeoutMills mills of timeouts.
       * @return response  response returned.
       * @throws NacosException exception throw.
       */
      Response request(Request request, long timeoutMills) throws NacosException;
      
      /**
       * send request.
       *
       * @param request request.
       * @return request future.
       * @throws NacosException exception throw.
       */
      RequestFuture requestFuture(Request request) throws NacosException;
      
      /**
       * send async request.
       *
       * @param request         request.
       * @param requestCallBack callback of request.
       * @throws NacosException exception throw.
       */
      void asyncRequest(Request request, RequestCallBack requestCallBack) throws NacosException;
      
      /**
       * close connection.
       */
      void close();
      
  }
  