ManagerQueryHandler.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.manager;

import org.apache.log4j.Logger;
import org.opencloudb.config.ErrorCode;
import org.opencloudb.handler.ClearHandler;
import org.opencloudb.handler.ConfFileHandler;
import org.opencloudb.handler.ReloadHandler;
import org.opencloudb.handler.RollbackHandler;
import org.opencloudb.handler.SelectHandler;
import org.opencloudb.handler.ShowHandler;
import org.opencloudb.handler.ShowServerLog;
import org.opencloudb.handler.StopHandler;
import org.opencloudb.handler.SwitchHandler;
import org.opencloudb.net.handler.FrontendQueryHandler;
import org.opencloudb.net.mysql.OkPacket;
import org.opencloudb.parser.ManagerParse;
import org.opencloudb.response.KillConnection;
import org.opencloudb.response.Offline;
import org.opencloudb.response.Online;

/**
 * @author mycat
 */
public class ManagerQueryHandler implements FrontendQueryHandler {
    private static final Logger LOGGER = Logger.getLogger(ManagerQueryHandler.class);

	private final ManagerConnection source;
	protected Boolean readOnly;

	public void setReadOnly(Boolean readOnly) {
		this.readOnly = readOnly;
	}

	public ManagerQueryHandler(ManagerConnection source) {
		this.source = source;
	}

    @Override
    public void query(String sql) {
        ManagerConnection c = this.source;
        if (LOGGER.isDebugEnabled()) {
            LOGGER.debug(new StringBuilder().append(c).append(sql).toString());
        }
        int rs = ManagerParse.parse(sql);
        switch (rs & 0xff) {
        case ManagerParse.SELECT:
            SelectHandler.handle(sql, c, rs >>> 8);
            break;
        case ManagerParse.SET:
            c.write(c.writeToBuffer(OkPacket.OK, c.allocate()));
            break;
        case ManagerParse.SHOW:
            ShowHandler.handle(sql, c, rs >>> 8);
            break;
        case ManagerParse.SWITCH:
            SwitchHandler.handler(sql, c, rs >>> 8);
            break;
        case ManagerParse.KILL_CONN:
            KillConnection.response(sql, rs >>> 8, c);
            break;
        case ManagerParse.OFFLINE:
            Offline.execute(sql, c);
            break;
        case ManagerParse.ONLINE:
            Online.execute(sql, c);
            break;
        case ManagerParse.STOP:
            StopHandler.handle(sql, c, rs >>> 8);
            break;
        case ManagerParse.RELOAD:
            ReloadHandler.handle(sql, c, rs >>> 8);
            break;
        case ManagerParse.ROLLBACK:
            RollbackHandler.handle(sql, c, rs >>> 8);
            break;
        case ManagerParse.CLEAR:
            ClearHandler.handle(sql, c, rs >>> 8);
            break;
        case ManagerParse.CONFIGFILE:
           ConfFileHandler.handle(sql, c);
            break;
        case ManagerParse.LOGFILE:
            ShowServerLog.handle(sql, c);
             break;
        default:
            c.writeErrMessage(ErrorCode.ER_YES, "Unsupported statement");
        }
    }

}