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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