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diff --git a/src/db/update/Service.hxx b/src/db/update/Service.hxx
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+++ b/src/db/update/Service.hxx
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+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_UPDATE_SERVICE_HXX
+#define MPD_UPDATE_SERVICE_HXX
+
+#include "check.h"
+#include "Queue.hxx"
+#include "event/DeferredMonitor.hxx"
+#include "thread/Thread.hxx"
+
+class SimpleDatabase;
+class DatabaseListener;
+class UpdateWalk;
+class CompositeStorage;
+
+/**
+ * This class manages the update queue and runs the update thread.
+ */
+class UpdateService final : DeferredMonitor {
+	enum Progress {
+		UPDATE_PROGRESS_IDLE = 0,
+		UPDATE_PROGRESS_RUNNING = 1,
+		UPDATE_PROGRESS_DONE = 2
+	};
+
+	SimpleDatabase &db;
+	CompositeStorage &storage;
+
+	DatabaseListener &listener;
+
+	Progress progress;
+
+	bool modified;
+
+	Thread update_thread;
+
+	static const unsigned update_task_id_max = 1 << 15;
+
+	unsigned update_task_id;
+
+	UpdateQueue queue;
+
+	UpdateQueueItem next;
+
+	UpdateWalk *walk;
+
+public:
+	UpdateService(EventLoop &_loop, SimpleDatabase &_db,
+		      CompositeStorage &_storage,
+		      DatabaseListener &_listener);
+
+	~UpdateService();
+
+	/**
+	 * Returns a non-zero job id when we are currently updating
+	 * the database.
+	 */
+	unsigned GetId() const {
+		return next.id;
+	}
+
+	/**
+	 * Add this path to the database update queue.
+	 *
+	 * @param path a path to update; if an empty string,
+	 * the whole music directory is updated
+	 * @return the job id, or 0 on error
+	 */
+	gcc_nonnull_all
+	unsigned Enqueue(const char *path, bool discard);
+
+	/**
+	 * Clear the queue and cancel the current update.  Does not
+	 * wait for the thread to exit.
+	 */
+	void CancelAllAsync();
+
+	/**
+	 * Cancel all updates for the given mount point.  If an update
+	 * is already running for it, the method will wait for
+	 * cancellation to complete.
+	 */
+	void CancelMount(const char *uri);
+
+private:
+	/* virtual methods from class DeferredMonitor */
+	virtual void RunDeferred() override;
+
+	/* the update thread */
+	void Task();
+	static void Task(void *ctx);
+
+	void StartThread(UpdateQueueItem &&i);
+
+	unsigned GenerateId();
+};
+
+#endif