added scheduler

src/main/java/com/commafeed/backend/task/OldStatusesCleanupTask.java

@@ -0,0 +1,51 @@
+package com.commafeed.backend.task;
+
+import java.util.Date;
+import java.util.concurrent.TimeUnit;
+
+import lombok.RequiredArgsConstructor;
+
+import org.hibernate.SessionFactory;
+
+import com.commafeed.CommaFeedConfiguration;
+import com.commafeed.backend.dao.UnitOfWork;
+import com.commafeed.backend.service.DatabaseCleaningService;
+import com.commafeed.backend.task.SchedulingService.ScheduledTask;
+
+@RequiredArgsConstructor
+public class OldStatusesCleanupTask implements ScheduledTask {
+
+	private final SessionFactory sessionFactory;
+	private final CommaFeedConfiguration config;
+	private final DatabaseCleaningService cleaner;
+
+	@Override
+	public void run() {
+		new UnitOfWork<Void>(sessionFactory) {
+			@Override
+			protected Void runInSession() throws Exception {
+				Date threshold = config.getApplicationSettings().getUnreadThreshold();
+				if (threshold != null) {
+					cleaner.cleanStatusesOlderThan(threshold);
+				}
+				return null;
+			}
+		}.run();
+	}
+
+	@Override
+	public long getInitialDelay() {
+		return 5;
+	}
+
+	@Override
+	public long getPeriod() {
+		return 60;
+	}
+
+	@Override
+	public TimeUnit getTimeUnit() {
+		return TimeUnit.MINUTES;
+	}
+
+}

src/main/java/com/commafeed/backend/task/OrphansCleanupTask.java

@@ -0,0 +1,47 @@
+package com.commafeed.backend.task;
+
+import java.util.concurrent.TimeUnit;
+
+import lombok.RequiredArgsConstructor;
+
+import org.hibernate.SessionFactory;
+
+import com.commafeed.backend.dao.UnitOfWork;
+import com.commafeed.backend.service.DatabaseCleaningService;
+import com.commafeed.backend.task.SchedulingService.ScheduledTask;
+
+@RequiredArgsConstructor
+public class OrphansCleanupTask implements ScheduledTask {
+
+	private final SessionFactory sessionFactory;
+	private final DatabaseCleaningService cleaner;
+
+	@Override
+	public void run() {
+		new UnitOfWork<Void>(sessionFactory) {
+			@Override
+			protected Void runInSession() throws Exception {
+				cleaner.cleanEntriesWithoutSubscriptions();
+				cleaner.cleanFeedsWithoutSubscriptions();
+				cleaner.cleanContentsWithoutEntries();
+				return null;
+			}
+		}.run();
+	}
+
+	@Override
+	public long getInitialDelay() {
+		return 30;
+	}
+
+	@Override
+	public long getPeriod() {
+		return 60;
+	}
+
+	@Override
+	public TimeUnit getTimeUnit() {
+		return TimeUnit.MINUTES;
+	}
+
+}

src/main/java/com/commafeed/backend/task/SchedulingService.java

@@ -0,0 +1,56 @@
+package com.commafeed.backend.task;
+
+import io.dropwizard.lifecycle.Managed;
+
+import java.util.List;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+
+import lombok.extern.slf4j.Slf4j;
+
+import com.google.common.collect.Lists;
+
+@Slf4j
+public class SchedulingService implements Managed {
+
+	public static interface ScheduledTask {
+		void run();
+
+		long getInitialDelay();
+
+		long getPeriod();
+
+		TimeUnit getTimeUnit();
+	}
+
+	private List<ScheduledTask> tasks = Lists.newArrayList();
+	private ScheduledExecutorService executor;
+
+	@Override
+	public void start() throws Exception {
+		executor = Executors.newScheduledThreadPool(tasks.size());
+		for (final ScheduledTask task : tasks) {
+			Runnable runnable = new Runnable() {
+				@Override
+				public void run() {
+					try {
+						task.run();
+					} catch (Exception e) {
+						log.error(e.getMessage(), e);
+					}
+				}
+			};
+			executor.scheduleWithFixedDelay(runnable, task.getInitialDelay(), task.getPeriod(), task.getTimeUnit());
+		}
+	}
+
+	@Override
+	public void stop() throws Exception {
+		executor.shutdown();
+	}
+
+	public void register(ScheduledTask task) {
+		tasks.add(task);
+	}
+}