update: convert to C++

1 files changed, 186 insertions, 0 deletions

diff --git a/src/UpdateGlue.cxx b/src/UpdateGlue.cxx
new file mode 100644
index 000000000..203f16b76
--- /dev/null
+++ b/src/UpdateGlue.cxx
@@ -0,0 +1,186 @@
+/*
+ * Copyright (C) 2003-2011 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"
+
+extern "C" {
+#include "database.h"
+#include "mapper.h"
+#include "playlist.h"
+#include "event_pipe.h"
+#include "idle.h"
+#include "stats.h"
+}
+
+#include "Main.hxx"
+#include "mpd_error.h"
+
+#include <glib.h>
+
+#include <assert.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "update"
+
+static enum update_progress {
+	UPDATE_PROGRESS_IDLE = 0,
+	UPDATE_PROGRESS_RUNNING = 1,
+	UPDATE_PROGRESS_DONE = 2
+} progress;
+
+static bool modified;
+
+static GThread *update_thr;
+
+static const unsigned update_task_id_max = 1 << 15;
+
+static unsigned update_task_id;
+
+/* XXX this flag is passed to update_task() */
+static bool discard;
+
+unsigned
+isUpdatingDB(void)
+{
+	return (progress != UPDATE_PROGRESS_IDLE) ? update_task_id : 0;
+}
+
+static void * update_task(void *_path)
+{
+	const char *path = (const char *)_path;
+
+	if (path != NULL && *path != 0)
+		g_debug("starting: %s", path);
+	else
+		g_debug("starting");
+
+	modified = update_walk(path, discard);
+
+	if (modified || !db_exists()) {
+		GError *error = NULL;
+		if (!db_save(&error)) {
+			g_warning("Failed to save database: %s",
+				  error->message);
+			g_error_free(error);
+		}
+	}
+
+	if (path != NULL && *path != 0)
+		g_debug("finished: %s", path);
+	else
+		g_debug("finished");
+	g_free(_path);
+
+	progress = UPDATE_PROGRESS_DONE;
+	event_pipe_emit(PIPE_EVENT_UPDATE);
+	return NULL;
+}
+
+static void
+spawn_update_task(const char *path)
+{
+	GError *e = NULL;
+
+	assert(g_thread_self() == main_task);
+
+	progress = UPDATE_PROGRESS_RUNNING;
+	modified = false;
+
+	update_thr = g_thread_create(update_task, g_strdup(path), TRUE, &e);
+	if (update_thr == NULL)
+		MPD_ERROR("Failed to spawn update task: %s", e->message);
+
+	if (++update_task_id > update_task_id_max)
+		update_task_id = 1;
+	g_debug("spawned thread for update job id %i", update_task_id);
+}
+
+unsigned
+update_enqueue(const char *path, bool _discard)
+{
+	assert(g_thread_self() == main_task);
+
+	if (!db_is_simple() || !mapper_has_music_directory())
+		return 0;
+
+	if (progress != UPDATE_PROGRESS_IDLE) {
+		unsigned next_task_id =
+			update_queue_push(path, discard, update_task_id);
+		if (next_task_id == 0)
+			return 0;
+
+		return next_task_id > update_task_id_max ?  1 : next_task_id;
+	}
+
+	discard = _discard;
+	spawn_update_task(path);
+
+	idle_add(IDLE_UPDATE);
+
+	return update_task_id;
+}
+
+/**
+ * Called in the main thread after the database update is finished.
+ */
+static void update_finished_event(void)
+{
+	char *path;
+
+	assert(progress == UPDATE_PROGRESS_DONE);
+
+	g_thread_join(update_thr);
+
+	idle_add(IDLE_UPDATE);
+
+	if (modified) {
+		/* send "idle" events */
+		playlist_increment_version_all(&g_playlist);
+		idle_add(IDLE_DATABASE);
+	}
+
+	path = update_queue_shift(&discard);
+	if (path != NULL) {
+		/* schedule the next path */
+		spawn_update_task(path);
+		g_free(path);
+	} else {
+		progress = UPDATE_PROGRESS_IDLE;
+
+		stats_update();
+	}
+}
+
+void update_global_init(void)
+{
+	event_pipe_register(PIPE_EVENT_UPDATE, update_finished_event);
+
+	update_remove_global_init();
+	update_walk_global_init();
+}
+
+void update_global_finish(void)
+{
+	update_walk_global_finish();
+	update_remove_global_finish();
+}