com.autentia.tnt.util.ApplicationLock.java Source code

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Here is the source code for com.autentia.tnt.util.ApplicationLock.java

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/**
 * TNTConcept Easy Enterprise Management by Autentia Real Bussiness Solution S.L.
 * Copyright (C) 2007 Autentia Real Bussiness Solution S.L.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License.
 *
 * This program 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.autentia.tnt.util;

import com.autentia.tnt.version.Version;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Class to represent application state
 * 
 * @author Ivan Zaera Avellon
 */
public class ApplicationLock {
    private static final Log log = LogFactory.getLog(ApplicationLock.class);

    private static boolean locked = true;
    private static String reason = "msg.appLockNotInit";

    /** No instances of this class can be created */
    private ApplicationLock() {
    }

    public static boolean isLocked() {
        return locked;
    }

    public static String getReason() {
        return reason;
    }

    public static void refresh() {
        try {
            Version db = Version.getDatabaseVersion();
            Version code = Version.getApplicationVersion();

            int cmp = db.compareTo(code, Version.MINOR);
            if (cmp == 0) {
                locked = false;
                reason = "msg.notLocked";
                log.info("refresh - database version correct: application unlocked");
            } else if (cmp < 0) {
                locked = true;
                reason = "msg.dbNeedsUpdate";
                log.info("refresh - database version not correct: database needs update");
            } else {
                locked = true;
                reason = "msg.appNeedsUpdate";
                log.info("refresh - database version not correct: application code needs update");
            }
        } catch (Exception e) {
            log.fatal("refresh - exception initializing ApplicationLock: application will not be available", e);
            locked = true;
            reason = e.getMessage() + " (" + e.getClass().getSimpleName() + ")";
        }
    }
}