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-rw-r--r--src/db/update/UpdateGlue.cxx181
1 files changed, 181 insertions, 0 deletions
diff --git a/src/db/update/UpdateGlue.cxx b/src/db/update/UpdateGlue.cxx
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+++ 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();
+}