content: /*
   * Copyright 1999-2012 Alibaba Group.
   *  
   * 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.cobar.server.session;
  
  import com.alibaba.cobar.net.FrontendConnection;
  import com.alibaba.cobar.route.RouteResultset;
  
  /**
   * @author xianmao.hexm 2012-7-11
   */
  public interface Session {
  
      /**
       * 取得源端连接
       */
      FrontendConnection getSource();
  
      /**
       * 取得当前目标端数量
       */
      int getTargetCount();
  
      /**
       * 开启一个会话执行
       */
      void execute(RouteResultset rrs, int type);
  
      /**
       * 提交一个会话执行
       */
      void commit();
  
      /**
       * 回滚一个会话执行
       */
      void rollback();
  
      /**
       * 取消一个正在执行中的会话
       * 
       * @param sponsor 如果发起者为null，则表示由自己发起。
       */
      void cancel(FrontendConnection sponsor);
  
      /**
       * 终止会话，必须在关闭源端连接后执行该方法。
       */
      void terminate();
  
  }
  