WorkCleaner.java

package org.objectweb.jonas_lib.deployment.work;

import java.util.Enumeration;
import java.util.Vector;

import org.objectweb.util.monolog.api.Logger;
import org.objectweb.util.monolog.api.BasicLevel;

import org.objectweb.jonas.common.Log;

public class WorkCleaner extends Thread {

    private static Logger logger = Log.getLogger(Log.JONAS_DEPLOY_WORK_PREFIX);

    private static final int SLEEP_TIME = 300000;

    private static WorkCleaner unique = null;

    private Vector taskList = null;

    private WorkCleaner() {
        super("WorkCleaner");
        // set a low priority for this thread in order to reduce
        // the impacts on 'functionnal' threads.
        this.setPriority(Thread.MIN_PRIORITY);
        taskList = new Vector();
    }

    protected static Logger getLogger() {
        return logger;
    }

    public static synchronized WorkCleaner getInstance() {
        if (unique == null) {
            unique = new WorkCleaner();
        }
        getLogger().log(BasicLevel.DEBUG, "getInstance : ->" + unique);
        return unique;
    }

    public synchronized void registerTask(AbsCleanTask absCleanTask) throws CleanerException {
        getLogger().log(BasicLevel.DEBUG, "registerTask : called");
        // checks
        if (taskList == null) {
            throw new CleanerException("Can not add an entry, the vector is null");
        }
        if (absCleanTask == null) {
            throw new CleanerException("Can not add a null entry");
        }
        // Add if don't already exist
        if (!taskList.contains(absCleanTask)) {
            taskList.add(absCleanTask);
        }
    }

    public synchronized void executeTasks() {
        try {
            AbsCleanTask absCleanTask = null;

            getLogger().log(BasicLevel.DEBUG, "executeTasks : wake up");
            for (Enumeration e = taskList.elements(); e.hasMoreElements();) {

                absCleanTask = (AbsCleanTask) e.nextElement();
                absCleanTask.execute();
            }

        } catch (CleanerException e) {
            e.printStackTrace();
        }
    }

    public void run() {

        for (;;) {
            executeTasks();
            try {
                Thread.sleep(SLEEP_TIME);
            } catch (InterruptedException e) {
                throw new RuntimeException("Thread fail to sleep");
            }
        }
    }

}

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