jease.cms.service.Timers.java Source code

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Here is the source code for jease.cms.service.Timers.java

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/*
Copyright (C) 2016 maik.jablonski@jease.org
    
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, or
(at your option) any later version.
    
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 jease.cms.service;

import java.util.Timer;
import java.util.TimerTask;

import jease.Names;
import jease.Registry;
import jfix.util.Reflections;

import org.apache.commons.lang3.StringUtils;

/**
 * Implements a simple Timer which runs a runnable task from the Registry for
 * every second.
 */
public class Timers {

    private static Timer timer;
    private static String timerTaskClass;
    private static Runnable runnable;

    public static void start() {
        stop();
        timer = new Timer();
        timer.schedule(new TimerTask() {
            public void run() {
                try {
                    String newTimerTaskClass = Registry.getParameter(Names.JEASE_TIMER_TASK);
                    if (StringUtils.isNotBlank(newTimerTaskClass)) {
                        if (!StringUtils.equals(timerTaskClass, newTimerTaskClass)) {
                            timerTaskClass = newTimerTaskClass;
                            runnable = (Runnable) Reflections.newInstance(timerTaskClass);
                        }
                        if (runnable != null) {
                            runnable.run();
                        }
                    }
                } catch (Throwable e) {
                    timerTaskClass = null;
                    runnable = null;
                }
            }
        }, 1000, 1000);
    }

    public static void stop() {
        if (timer != null) {
            timer.cancel();
            timerTaskClass = null;
            runnable = null;
        }
    }

}