Delete inactive guest sessions

Lists of visited sessions for guest users which have not been active for
a fixed amount of time are now automatically deleted.

src/main/java/de/thm/arsnova/dao/CouchDBDao.java

@@ -1703,6 +1703,36 @@ public class CouchDBDao implements IDatabaseDao, ApplicationEventPublisherAware
 		return false;
 	}
 
+	@Override
+	public boolean deleteInactiveGuestVisitedSessionLists(long lastActivityBefore) {
+		try {
+			NovaView view = new NovaView("logged_in/by_last_activity_for_guests");
+			view.setEndKey(lastActivityBefore);
+			List<Document> results = this.getDatabase().view(view).getResults();
+
+			final List<Document> newDocs = new ArrayList<Document>();
+			for (Document oldDoc : results) {
+				final Document newDoc = new Document();
+				newDoc.setId(oldDoc.getId());
+				newDoc.setRev(oldDoc.getJSONObject("value").getString("_rev"));
+				newDoc.put("_deleted", true);
+				newDocs.add(newDoc);
+				LOGGER.debug("Marked logged_in document {} for deletion.", oldDoc.getId());
+			}
+
+			if (newDocs.size() > 0) {
+				getDatabase().bulkSaveDocuments(newDocs.toArray(new Document[newDocs.size()]));
+				LOGGER.info("Deleted {} visited session lists of inactive users.", newDocs.size());
+			}
+
+			return true;
+		} catch (IOException e) {
+			LOGGER.error("Could not delete visited session lists of inactive users.");
+		}
+
+		return false;
+	}
+
 	@Cacheable("lecturequestions")
 	@Override
 	public List<Question> getLectureQuestionsForUsers(final Session session) {

src/main/java/de/thm/arsnova/dao/IDatabaseDao.java

@@ -148,6 +148,8 @@ public interface IDatabaseDao {
 
 	boolean deleteInactiveGuestSessions(long lastActivityBefore);
 
+	boolean deleteInactiveGuestVisitedSessionLists(long lastActivityBefore);
+
 	List<Question> getLectureQuestionsForUsers(Session session);
 
 	List<Question> getLectureQuestionsForTeachers(Session session);

src/main/java/de/thm/arsnova/services/ISessionService.java

@@ -95,4 +95,6 @@ public interface ISessionService {
 	boolean flipFlashcards(String sessionkey, Boolean flip);
 
 	void deleteInactiveSessions();
+
+	void deleteInactiveVisitedSessionLists();
 }

src/main/java/de/thm/arsnova/services/SessionService.java

@@ -139,6 +139,16 @@ public class SessionService implements ISessionService, ApplicationEventPublishe
 		}
 	}
 
+	@Scheduled(fixedDelay = SESSION_INACTIVITY_CHECK_INTERVAL_MS)
+	public void deleteInactiveVisitedSessionLists() {
+		if (guestSessionInactivityThresholdDays > 0) {
+			LOGGER.info("Delete lists of visited session for inactive users.");
+			long unixTime = System.currentTimeMillis();
+			long lastActivityBefore = unixTime - guestSessionInactivityThresholdDays * 24 * 60 * 60 * 1000L;
+			databaseDao.deleteInactiveGuestVisitedSessionLists(lastActivityBefore);
+		}
+	}
+
 	public void setDatabaseDao(final IDatabaseDao newDatabaseDao) {
 		databaseDao = newDatabaseDao;
 	}

src/test/java/de/thm/arsnova/dao/StubDatabaseDao.java

@@ -351,6 +351,12 @@ public class StubDatabaseDao implements IDatabaseDao {
 		return false;
 	}
 
+	@Override
+	public boolean deleteInactiveGuestVisitedSessionLists(long lastActivityBefore) {
+		// TODO Auto-generated method stub
+		return false;
+	}
+
 	@Override
 	public void deleteAllQuestionsWithAnswers(Session session) {
 		// TODO Auto-generated method stub