/*
* 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.server.response;
import org.opencloudb.MycatServer;
import org.opencloudb.mysql.PacketUtil;
import org.opencloudb.net.FrontendConnection;
import org.opencloudb.net.mysql.ErrorPacket;
import org.opencloudb.net.mysql.OkPacket;
/**
* 加入了offline状态推送，用于心跳语句。
*
* @author mycat
*/
public class Ping {
private static final ErrorPacket error = PacketUtil.getShutdown();
public static void response(FrontendConnection c) {
if (MycatServer.getInstance().isOnline()) {
c.write(c.writeToBuffer(OkPacket.OK, c.allocate()));
} else {
error.write(c);
}
}
}