db/update: convert to OO API

Move global variables into the new classes.  That may allow multiple
update threads for multiple databases one day.

1 files changed, 57 insertions, 0 deletions

diff --git a/src/db/update/Remove.hxx b/src/db/update/Remove.hxx
new file mode 100644
index 000000000..1970c0a07
--- /dev/null
+++ b/src/db/update/Remove.hxx
@@ -0,0 +1,57 @@
+/*
+ * 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_REMOVE_HXX
+#define MPD_UPDATE_REMOVE_HXX
+
+#include "check.h"
+#include "event/DeferredMonitor.hxx"
+#include "thread/Mutex.hxx"
+#include "thread/Cond.hxx"
+
+struct Song;
+
+/**
+ * This class handles #Song removal.  It defers the action to the main
+ * thread to ensure that all references to the #Song are gone.
+ */
+class UpdateRemoveService final : DeferredMonitor {
+	Mutex remove_mutex;
+	Cond remove_cond;
+
+	const Song *removed_song;
+
+public:
+	UpdateRemoveService(EventLoop &_loop)
+		:DeferredMonitor(_loop) {}
+
+	/**
+	 * Sends a signal to the main thread which will in turn remove
+	 * the song: from the sticker database and from the playlist.
+	 * This serialized access is implemented to avoid excessive
+	 * locking.
+	 */
+	void Remove(const Song *song);
+
+private:
+	/* virtual methods from class DeferredMonitor */
+	virtual void RunDeferred() override;
+};
+
+#endif