1 files changed, 72 insertions, 0 deletions
diff --git a/src/StateFile.hxx b/src/StateFile.hxx
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--- /dev/null
+++ b/src/StateFile.hxx
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+/*
+ * Copyright (C) 2003-2013 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_STATE_FILE_HXX
+#define MPD_STATE_FILE_HXX
+
+#include "event/TimeoutMonitor.hxx"
+#include "fs/Path.hxx"
+#include "gcc.h"
+
+#include <string>
+
+struct Partition;
+
+class StateFile final : private TimeoutMonitor {
+	Path path;
+	std::string path_utf8;
+
+	Partition &partition;
+
+	/**
+	 * These version numbers determine whether we need to save the state
+	 * file.  If nothing has changed, we won't let the hard drive spin up.
+	 */
+	unsigned prev_volume_version, prev_output_version,
+		prev_playlist_version;
+
+public:
+	StateFile(Path &&path, Partition &partition, EventLoop &loop);
+
+	void Read();
+	void Write();
+
+	/**
+	 * Schedules a write if MPD's state was modified.
+	 */
+	void CheckModified();
+
+private:
+	/**
+	 * Save the current state versions for use with IsModified().
+	 */
+	void RememberVersions();
+
+	/**
+	 * Check if MPD's state was modified since the last
+	 * RememberVersions() call.
+	 */
+	gcc_pure
+	bool IsModified() const;
+
+	/* virtual methods from TimeoutMonitor */
+	virtual void OnTimeout() override;
+};
+
+#endif /* STATE_FILE_H */