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.response;
  
  import org.apache.log4j.Logger;
  
  import com.alibaba.cobar.CobarServer;
  import com.alibaba.cobar.config.ErrorCode;
  import com.alibaba.cobar.net.mysql.ErrorPacket;
  import com.alibaba.cobar.net.mysql.HeartbeatPacket;
  import com.alibaba.cobar.net.mysql.OkPacket;
  import com.alibaba.cobar.server.ServerConnection;
  import com.alibaba.cobar.util.TimeUtil;
  
  public class Heartbeat {
  
      private static final Logger HEARTBEAT = Logger.getLogger("heartbeat");
  
      public static void response(ServerConnection c, byte[] data) {
          HeartbeatPacket hp = new HeartbeatPacket();
          hp.read(data);
          if (CobarServer.getInstance().isOnline()) {
              OkPacket ok = new OkPacket();
              ok.packetId = 1;
              ok.affectedRows = hp.id;
              ok.serverStatus = 2;
              ok.write(c);
              if (HEARTBEAT.isInfoEnabled()) {
                  HEARTBEAT.info(responseMessage("OK", c, hp.id));
              }
          } else {
              ErrorPacket error = new ErrorPacket();
              error.packetId = 1;
              error.errno = ErrorCode.ER_SERVER_SHUTDOWN;
              error.message = String.valueOf(hp.id).getBytes();
              error.write(c);
              if (HEARTBEAT.isInfoEnabled()) {
                  HEARTBEAT.info(responseMessage("ERROR", c, hp.id));
              }
          }
      }
  
      private static String responseMessage(String action, ServerConnection c, long id) {
          return new StringBuilder("RESPONSE:").append(action)
                                               .append(", id=")
                                               .append(id)
                                               .append(", host=")
                                               .append(c.getHost())
                                               .append(", port=")
                                               .append(c.getPort())
                                               .append(", time=")
                                               .append(TimeUtil.currentTimeMillis())
                                               .toString();
      }
  
  }
  