From 0c995060bb904c181f5ca58a2f2fbeb7c525d2cd Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Thu, 3 Sep 2015 14:00:21 +0200
Subject: [server] Improve mail handling, delete old lectures

---
 .../bwlp/sat/maintenance/DeleteOldLectures.java    | 64 ++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 dozentenmodulserver/src/main/java/org/openslx/bwlp/sat/maintenance/DeleteOldLectures.java

(limited to 'dozentenmodulserver/src/main/java/org/openslx/bwlp/sat/maintenance/DeleteOldLectures.java')

diff --git a/dozentenmodulserver/src/main/java/org/openslx/bwlp/sat/maintenance/DeleteOldLectures.java b/dozentenmodulserver/src/main/java/org/openslx/bwlp/sat/maintenance/DeleteOldLectures.java
new file mode 100644
index 00000000..c0a5b65f
--- /dev/null
+++ b/dozentenmodulserver/src/main/java/org/openslx/bwlp/sat/maintenance/DeleteOldLectures.java
@@ -0,0 +1,64 @@
+package org.openslx.bwlp.sat.maintenance;
+
+import java.sql.SQLException;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.log4j.Logger;
+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 Logger LOGGER = Logger.getLogger(DeleteOldLectures.class);
+
+	private static final DeleteOldLectures instance = new DeleteOldLectures();
+
+	private static long blockedUntil = 0;
+
+	/**
+	 * Initialize the delete task. This schedules a timer that runs
+	 * every 5 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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