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.manager.response;
  
  import java.nio.ByteBuffer;
  
  import com.alibaba.cobar.CobarServer;
  import com.alibaba.cobar.config.Fields;
  import com.alibaba.cobar.manager.ManagerConnection;
  import com.alibaba.cobar.manager.parser.ManagerParseShow;
  import com.alibaba.cobar.mysql.PacketUtil;
  import com.alibaba.cobar.net.mysql.EOFPacket;
  import com.alibaba.cobar.net.mysql.FieldPacket;
  import com.alibaba.cobar.net.mysql.ResultSetHeaderPacket;
  import com.alibaba.cobar.net.mysql.RowDataPacket;
  import com.alibaba.cobar.util.LongUtil;
  
  /**
   * @author xianmao.hexm 2010-9-27 下午02:53:11
   */
  public final class ShowTime {
  
      private static final int FIELD_COUNT = 1;
      private static final ResultSetHeaderPacket header = PacketUtil.getHeader(FIELD_COUNT);
      private static final FieldPacket[] fields = new FieldPacket[FIELD_COUNT];
      private static final EOFPacket eof = new EOFPacket();
      static {
          int i = 0;
          byte packetId = 0;
          header.packetId = ++packetId;
  
          fields[i] = PacketUtil.getField("TIMESTAMP", Fields.FIELD_TYPE_LONGLONG);
          fields[i++].packetId = ++packetId;
  
          eof.packetId = ++packetId;
      }
  
      public static void execute(ManagerConnection c, int type) {
          ByteBuffer buffer = c.allocate();
  
          // write header
          buffer = header.write(buffer, c);
  
          // write fields
          for (FieldPacket field : fields) {
              buffer = field.write(buffer, c);
          }
  
          // write eof
          buffer = eof.write(buffer, c);
  
          // write rows
          byte packetId = eof.packetId;
          RowDataPacket row = getRow(type);
          row.packetId = ++packetId;
          buffer = row.write(buffer, c);
  
          // write last eof
          EOFPacket lastEof = new EOFPacket();
          lastEof.packetId = ++packetId;
          buffer = lastEof.write(buffer, c);
  
          // post write
          c.write(buffer);
      }
  
      private static RowDataPacket getRow(int type) {
          RowDataPacket row = new RowDataPacket(FIELD_COUNT);
          switch (type) {
          case ManagerParseShow.TIME_CURRENT:
              row.add(LongUtil.toBytes(System.currentTimeMillis()));
              break;
          case ManagerParseShow.TIME_STARTUP:
              row.add(LongUtil.toBytes(CobarServer.getInstance().getStartupTime()));
              break;
          default:
              row.add(LongUtil.toBytes(0L));
          }
          return row;
      }
  
  }
  