1 files changed, 181 insertions, 0 deletions
diff --git a/src/db/update/UpdateGlue.cxx b/src/db/update/UpdateGlue.cxx
new file mode 100644
index 000000000..d18747ba1
--- /dev/null
+++ b/src/db/update/UpdateGlue.cxx
@@ -0,0 +1,181 @@
+/*
+ * 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.
+ */
+
+#include "config.h"
+#include "UpdateGlue.hxx"
+#include "UpdateQueue.hxx"
+#include "UpdateWalk.hxx"
+#include "UpdateRemove.hxx"
+#include "UpdateDomain.hxx"
+#include "Mapper.hxx"
+#include "db/DatabaseSimple.hxx"
+#include "Idle.hxx"
+#include "GlobalEvents.hxx"
+#include "util/Error.hxx"
+#include "Log.hxx"
+#include "Main.hxx"
+#include "Instance.hxx"
+#include "system/FatalError.hxx"
+#include "thread/Id.hxx"
+#include "thread/Thread.hxx"
+#include "thread/Util.hxx"
+
+#include <assert.h>
+
+static enum update_progress {
+	UPDATE_PROGRESS_IDLE = 0,
+	UPDATE_PROGRESS_RUNNING = 1,
+	UPDATE_PROGRESS_DONE = 2
+} progress;
+
+static bool modified;
+
+static Thread update_thread;
+
+static const unsigned update_task_id_max = 1 << 15;
+
+static unsigned update_task_id;
+
+static UpdateQueueItem next;
+
+unsigned
+isUpdatingDB(void)
+{
+	return next.id;
+}
+
+static void
+update_task(gcc_unused void *ctx)
+{
+	if (!next.path_utf8.empty())
+		FormatDebug(update_domain, "starting: %s",
+			    next.path_utf8.c_str());
+	else
+		LogDebug(update_domain, "starting");
+
+	SetThreadIdlePriority();
+
+	modified = update_walk(next.path_utf8.c_str(), next.discard);
+
+	if (modified || !db_exists()) {
+		Error error;
+		if (!db_save(error))
+			LogError(error, "Failed to save database");
+	}
+
+	if (!next.path_utf8.empty())
+		FormatDebug(update_domain, "finished: %s",
+			    next.path_utf8.c_str());
+	else
+		LogDebug(update_domain, "finished");
+
+	progress = UPDATE_PROGRESS_DONE;
+	GlobalEvents::Emit(GlobalEvents::UPDATE);
+}
+
+static void
+spawn_update_task(UpdateQueueItem &&i)
+{
+	assert(main_thread.IsInside());
+
+	progress = UPDATE_PROGRESS_RUNNING;
+	modified = false;
+
+	next = std::move(i);
+
+	Error error;
+	if (!update_thread.Start(update_task, nullptr, error))
+		FatalError(error);
+
+	FormatDebug(update_domain,
+		    "spawned thread for update job id %i", next.id);
+}
+
+static unsigned
+generate_update_id()
+{
+	unsigned id = update_task_id + 1;
+	if (id > update_task_id_max)
+		id = 1;
+	return id;
+}
+
+unsigned
+update_enqueue(const char *path, bool discard)
+{
+	assert(main_thread.IsInside());
+
+	if (!db_is_simple() || !mapper_has_music_directory())
+		return 0;
+
+	if (progress != UPDATE_PROGRESS_IDLE) {
+		const unsigned id = generate_update_id();
+		if (!update_queue_push(path, discard, id))
+			return 0;
+
+		update_task_id = id;
+		return id;
+	}
+
+	const unsigned id = update_task_id = generate_update_id();
+	spawn_update_task(UpdateQueueItem(path, discard, id));
+
+	idle_add(IDLE_UPDATE);
+
+	return id;
+}
+
+/**
+ * Called in the main thread after the database update is finished.
+ */
+static void update_finished_event(void)
+{
+	assert(progress == UPDATE_PROGRESS_DONE);
+	assert(next.IsDefined());
+
+	update_thread.Join();
+	next = UpdateQueueItem();
+
+	idle_add(IDLE_UPDATE);
+
+	if (modified)
+		/* send "idle" events */
+		instance->DatabaseModified();
+
+	auto i = update_queue_shift();
+	if (i.IsDefined()) {
+		/* schedule the next path */
+		spawn_update_task(std::move(i));
+	} else {
+		progress = UPDATE_PROGRESS_IDLE;
+	}
+}
+
+void update_global_init(void)
+{
+	GlobalEvents::Register(GlobalEvents::UPDATE, update_finished_event);
+
+	update_remove_global_init();
+	update_walk_global_init();
+}
+
+void update_global_finish(void)
+{
+	update_walk_global_finish();
+}