FrontendCommandHandler.java example

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openclouddb-master
/*
 * 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.handler;

import org.opencloudb.config.ErrorCode;
import org.opencloudb.net.FrontendConnection;
import org.opencloudb.net.NIOHandler;
import org.opencloudb.net.mysql.MySQLPacket;
import org.opencloudb.statistic.CommandCount;

/**
 * 前端命令处理器
 * 
 * @author mycat
 */
public class FrontendCommandHandler implements NIOHandler {

	protected final FrontendConnection source;
	protected final CommandCount commands;

	public FrontendCommandHandler(FrontendConnection source) {
		this.source = source;
		this.commands = source.getProcessor().getCommands();
	}

	@Override
	public void handle(byte[] data) {
		switch (data[4]) {
		case MySQLPacket.COM_INIT_DB:
			commands.doInitDB();
			source.initDB(data);
			break;
		case MySQLPacket.COM_QUERY:
			commands.doQuery();
			source.query(data);
			break;
		case MySQLPacket.COM_PING:
			commands.doPing();
			source.ping();
			break;
		case MySQLPacket.COM_QUIT:
			commands.doQuit();
			source.close("quit cmd");
			break;
		case MySQLPacket.COM_PROCESS_KILL:
			commands.doKill();
			source.kill(data);
			break;
		case MySQLPacket.COM_STMT_PREPARE:
			commands.doStmtPrepare();
			source.stmtPrepare(data);
			break;
		case MySQLPacket.COM_STMT_EXECUTE:
			commands.doStmtExecute();
			source.stmtExecute(data);
			break;
		case MySQLPacket.COM_STMT_CLOSE:
			commands.doStmtClose();
			source.stmtClose(data);
			break;
		case MySQLPacket.COM_HEARTBEAT:
			commands.doHeartbeat();
			source.heartbeat(data);
			break;
		default:
			commands.doOther();
			source.writeErrMessage(ErrorCode.ER_UNKNOWN_COM_ERROR,
					"Unknown command");
		}
	}

}