1 files changed, 161 insertions, 0 deletions
diff --git a/src/db/update/UpdateGlue.cxx b/src/db/update/UpdateGlue.cxx
new file mode 100644
index 000000000..c1d563ffd
--- /dev/null
+++ b/src/db/update/UpdateGlue.cxx
@@ -0,0 +1,161 @@
+/*
+ * 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 "Service.hxx"
+#include "UpdateDomain.hxx"
+#include "db/DatabaseListener.hxx"
+#include "db/plugins/SimpleDatabasePlugin.hxx"
+#include "Idle.hxx"
+#include "util/Error.hxx"
+#include "Log.hxx"
+#include "Instance.hxx"
+#include "system/FatalError.hxx"
+#include "thread/Id.hxx"
+#include "thread/Thread.hxx"
+#include "thread/Util.hxx"
+
+#ifndef NDEBUG
+#include "event/Loop.hxx"
+#endif
+
+#include <assert.h>
+
+inline void
+UpdateService::Task()
+{
+	if (!next.path_utf8.empty())
+		FormatDebug(update_domain, "starting: %s",
+			    next.path_utf8.c_str());
+	else
+		LogDebug(update_domain, "starting");
+
+	SetThreadIdlePriority();
+
+	modified = walk.Walk(*db.GetRoot(), next.path_utf8.c_str(),
+			     next.discard);
+
+	if (modified || !db.FileExists()) {
+		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;
+	DeferredMonitor::Schedule();
+}
+
+void
+UpdateService::Task(void *ctx)
+{
+	UpdateService &service = *(UpdateService *)ctx;
+	return service.Task();
+}
+
+void
+UpdateService::StartThread(UpdateQueueItem &&i)
+{
+	assert(GetEventLoop().IsInsideOrNull());
+
+	progress = UPDATE_PROGRESS_RUNNING;
+	modified = false;
+
+	next = std::move(i);
+
+	Error error;
+	if (!update_thread.Start(Task, this, error))
+		FatalError(error);
+
+	FormatDebug(update_domain,
+		    "spawned thread for update job id %i", next.id);
+}
+
+unsigned
+UpdateService::GenerateId()
+{
+	unsigned id = update_task_id + 1;
+	if (id > update_task_id_max)
+		id = 1;
+	return id;
+}
+
+unsigned
+UpdateService::Enqueue(const char *path, bool discard)
+{
+	assert(GetEventLoop().IsInsideOrNull());
+
+	if (progress != UPDATE_PROGRESS_IDLE) {
+		const unsigned id = GenerateId();
+		if (!queue.Push(path, discard, id))
+			return 0;
+
+		update_task_id = id;
+		return id;
+	}
+
+	const unsigned id = update_task_id = GenerateId();
+	StartThread(UpdateQueueItem(path, discard, id));
+
+	idle_add(IDLE_UPDATE);
+
+	return id;
+}
+
+/**
+ * Called in the main thread after the database update is finished.
+ */
+void
+UpdateService::RunDeferred()
+{
+	assert(progress == UPDATE_PROGRESS_DONE);
+	assert(next.IsDefined());
+
+	update_thread.Join();
+	next = UpdateQueueItem();
+
+	idle_add(IDLE_UPDATE);
+
+	if (modified)
+		/* send "idle" events */
+		listener.OnDatabaseModified();
+
+	auto i = queue.Pop();
+	if (i.IsDefined()) {
+		/* schedule the next path */
+		StartThread(std::move(i));
+	} else {
+		progress = UPDATE_PROGRESS_IDLE;
+	}
+}
+
+UpdateService::UpdateService(EventLoop &_loop, SimpleDatabase &_db,
+			     Storage &_storage,
+			     DatabaseListener &_listener)
+	:DeferredMonitor(_loop), db(_db), listener(_listener),
+	 progress(UPDATE_PROGRESS_IDLE),
+	 update_task_id(0),
+	 walk(_loop, _listener, _storage)
+{
+}