/*
* Copyright (c) 2013, OpenCloudDB/MyCAT and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software;Designed and Developed mainly by many Chinese
* opensource volunteers. you can redistribute it and/or modify it under the
* terms of the GNU General Public License version 2 only, as published by the
* Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Any questions about this component can be directed to it's project Web address
* https://code.google.com/p/opencloudb/.
*
*/
package org.opencloudb.net.mysql;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import org.opencloudb.mysql.BufferUtil;
import org.opencloudb.mysql.MySQLMessage;
import org.opencloudb.mysql.StreamUtil;
import org.opencloudb.net.BackendAIOConnection;
/**
* From client to server whenever the client wants the server to do something.
*
* <pre>
* Bytes Name
* ----- ----
* 1 command
* n arg
*
* command: The most common value is 03 COM_QUERY, because
* INSERT UPDATE DELETE SELECT etc. have this code.
* The possible values at time of writing (taken
* from /include/mysql_com.h for enum_server_command) are:
*
* # Name Associated client function
* - ---- --------------------------
* 0x00 COM_SLEEP (none, this is an internal thread state)
* 0x01 COM_QUIT mysql_close
* 0x02 COM_INIT_DB mysql_select_db
* 0x03 COM_QUERY mysql_real_query
* 0x04 COM_FIELD_LIST mysql_list_fields
* 0x05 COM_CREATE_DB mysql_create_db (deprecated)
* 0x06 COM_DROP_DB mysql_drop_db (deprecated)
* 0x07 COM_REFRESH mysql_refresh
* 0x08 COM_SHUTDOWN mysql_shutdown
* 0x09 COM_STATISTICS mysql_stat
* 0x0a COM_PROCESS_INFO mysql_list_processes
* 0x0b COM_CONNECT (none, this is an internal thread state)
* 0x0c COM_PROCESS_KILL mysql_kill
* 0x0d COM_DEBUG mysql_dump_debug_info
* 0x0e COM_PING mysql_ping
* 0x0f COM_TIME (none, this is an internal thread state)
* 0x10 COM_DELAYED_INSERT (none, this is an internal thread state)
* 0x11 COM_CHANGE_USER mysql_change_user
* 0x12 COM_BINLOG_DUMP sent by the slave IO thread to request a binlog
* 0x13 COM_TABLE_DUMP LOAD TABLE ... FROM MASTER (deprecated)
* 0x14 COM_CONNECT_OUT (none, this is an internal thread state)
* 0x15 COM_REGISTER_SLAVE sent by the slave to register with the master (optional)
* 0x16 COM_STMT_PREPARE mysql_stmt_prepare
* 0x17 COM_STMT_EXECUTE mysql_stmt_execute
* 0x18 COM_STMT_SEND_LONG_DATA mysql_stmt_send_long_data
* 0x19 COM_STMT_CLOSE mysql_stmt_close
* 0x1a COM_STMT_RESET mysql_stmt_reset
* 0x1b COM_SET_OPTION mysql_set_server_option
* 0x1c COM_STMT_FETCH mysql_stmt_fetch
*
* arg: The text of the command is just the way the user typed it, there is no processing
* by the client (except removal of the final ';').
* This field is not a null-terminated string; however,
* the size can be calculated from the packet size,
* and the MySQL client appends '\0' when receiving.
*
* @see http://forge.mysql.com/wiki/MySQL_Internals_ClientServer_Protocol#Command_Packet_.28Overview.29
* </pre>
*
* @author mycat
*/
public class CommandPacket extends MySQLPacket {
public byte command;
public byte[] arg;
public void read(byte[] data) {
MySQLMessage mm = new MySQLMessage(data);
packetLength = mm.readUB3();
packetId = mm.read();
command = mm.read();
arg = mm.readBytes();
}
public void write(OutputStream out) throws IOException {
StreamUtil.writeUB3(out, calcPacketSize());
StreamUtil.write(out, packetId);
StreamUtil.write(out, command);
out.write(arg);
}
@Override
public void write(BackendAIOConnection c) {
ByteBuffer buffer = c.allocate();
BufferUtil.writeUB3(buffer, calcPacketSize());
buffer.put(packetId);
buffer.put(command);
buffer = c.writeToBuffer(arg, buffer);
c.write(buffer);
}
@Override
public int calcPacketSize() {
return 1 + arg.length;
}
@Override
protected String getPacketInfo() {
return "MySQL Command Packet";
}
}