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package org.openslx.bwlp.sat.maintenance;
import java.sql.SQLException;
import java.util.concurrent.TimeUnit;
import org.joda.time.DateTime;
import org.openslx.bwlp.sat.database.mappers.DbLecture;
import org.openslx.util.QuickTimer;
import org.openslx.util.QuickTimer.Task;
/**
* Delete old image versions (images that reached their expire time).
*/
public class DeleteOldLectures implements Runnable {
private static final DeleteOldLectures instance = new DeleteOldLectures();
private static long blockedUntil = 0;
/**
* Initialize the delete task. This schedules a timer that runs
* every 7 minutes. If the hour of day reaches 4, it will fire
* the task, and block it from running for the next 12 hours.
*/
public synchronized static void init() {
if (blockedUntil != 0)
return;
blockedUntil = 1;
QuickTimer.scheduleAtFixedRate(new Task() {
@Override
public void fire() {
if (blockedUntil > System.currentTimeMillis())
return;
DateTime now = DateTime.now();
if (now.getHourOfDay() != 4 || now.getMinuteOfHour() > 15)
return;
start();
}
}, TimeUnit.MINUTES.toMillis(6), TimeUnit.MINUTES.toMillis(7));
}
public synchronized static void start() {
if (blockedUntil > System.currentTimeMillis())
return;
if (Maintenance.trySubmit(instance)) {
blockedUntil = System.currentTimeMillis() + TimeUnit.HOURS.toMillis(12);
}
}
private DeleteOldLectures() {
}
@Override
public void run() {
try {
DbLecture.deleteOld(365);
} catch (SQLException e) {
}
}
}
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