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.handler;
  
  import com.alibaba.cobar.CobarServer;
  import com.alibaba.cobar.config.ErrorCode;
  import com.alibaba.cobar.net.FrontendConnection;
  import com.alibaba.cobar.net.NIOProcessor;
  import com.alibaba.cobar.net.mysql.OkPacket;
  import com.alibaba.cobar.server.ServerConnection;
  import com.alibaba.cobar.util.StringUtil;
  
  /**
   * @author xianmao.hexm
   */
  public class KillHandler {
  
      public static void handle(String stmt, int offset, ServerConnection c) {
          String id = stmt.substring(offset).trim();
          if (StringUtil.isEmpty(id)) {
              c.writeErrMessage(ErrorCode.ER_NO_SUCH_THREAD, "NULL connection id");
          } else {
              // get value
              long value = 0;
              try {
                  value = Long.parseLong(id);
              } catch (NumberFormatException e) {
                  c.writeErrMessage(ErrorCode.ER_NO_SUCH_THREAD, "Invalid connection id:" + id);
                  return;
              }
  
              // kill myself
              if (value == c.getId()) {
                  getOkPacket().write(c);
                  c.write(c.allocate());
                  return;
              }
  
              // get connection and close it
              FrontendConnection fc = null;
              NIOProcessor[] processors = CobarServer.getInstance().getProcessors();
              for (NIOProcessor p : processors) {
                  if ((fc = p.getFrontends().get(value)) != null) {
                      break;
                  }
              }
              if (fc != null) {
                  fc.close();
                  getOkPacket().write(c);
              } else {
                  c.writeErrMessage(ErrorCode.ER_NO_SUCH_THREAD, "Unknown connection id:" + id);
              }
          }
      }
  
      private static OkPacket getOkPacket() {
          OkPacket packet = new OkPacket();
          packet.packetId = 1;
          packet.affectedRows = 0;
          packet.serverStatus = 2;
          return packet;
      }
  
  }
  