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-rw-r--r--src/inotify_queue.c134
1 files changed, 134 insertions, 0 deletions
diff --git a/src/inotify_queue.c b/src/inotify_queue.c
new file mode 100644
index 000000000..4941f4905
--- /dev/null
+++ b/src/inotify_queue.c
@@ -0,0 +1,134 @@
+/*
+ * Copyright (C) 2003-2009 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 "inotify_queue.h"
+#include "update.h"
+
+#include <glib.h>
+
+#include <string.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "inotify"
+
+enum {
+ /**
+ * Wait this long after the last change before calling
+ * update_enqueue(). This increases the probability that
+ * updates can be bundled.
+ */
+ INOTIFY_UPDATE_DELAY_S = 5,
+};
+
+static GSList *inotify_queue;
+static guint queue_source_id;
+
+void
+mpd_inotify_queue_init(void)
+{
+}
+
+static void
+free_callback(gpointer data, G_GNUC_UNUSED gpointer user_data)
+{
+ g_free(data);
+}
+
+void
+mpd_inotify_queue_finish(void)
+{
+ if (queue_source_id != 0)
+ g_source_remove(queue_source_id);
+
+ g_slist_foreach(inotify_queue, free_callback, NULL);
+ g_slist_free(inotify_queue);
+}
+
+static gboolean
+mpd_inotify_run_update(G_GNUC_UNUSED gpointer data)
+{
+ unsigned id;
+
+ while (inotify_queue != NULL) {
+ char *uri_utf8 = inotify_queue->data;
+
+ id = update_enqueue(uri_utf8, false);
+ if (id == 0)
+ /* retry later */
+ return true;
+
+ g_debug("updating '%s' job=%u", uri_utf8, id);
+
+ g_free(uri_utf8);
+ inotify_queue = g_slist_delete_link(inotify_queue,
+ inotify_queue);
+ }
+
+ /* done, remove the timer event by returning false */
+ queue_source_id = 0;
+ return false;
+}
+
+static bool
+path_in(const char *path, const char *possible_parent)
+{
+ size_t length = strlen(possible_parent);
+
+ return path[0] == 0 ||
+ (memcmp(possible_parent, path, length) == 0 &&
+ (path[length] == 0 || path[length] == '/'));
+}
+
+void
+mpd_inotify_enqueue(char *uri_utf8)
+{
+ GSList *old_queue = inotify_queue;
+
+ if (queue_source_id != 0)
+ g_source_remove(queue_source_id);
+ queue_source_id = g_timeout_add_seconds(INOTIFY_UPDATE_DELAY_S,
+ mpd_inotify_run_update, NULL);
+
+ inotify_queue = NULL;
+ while (old_queue != NULL) {
+ char *current_uri = old_queue->data;
+
+ if (path_in(uri_utf8, current_uri)) {
+ /* already enqueued */
+ g_free(uri_utf8);
+ inotify_queue = g_slist_concat(inotify_queue,
+ old_queue);
+ return;
+ }
+
+ old_queue = g_slist_delete_link(old_queue, old_queue);
+
+ if (path_in(current_uri, uri_utf8))
+ /* existing path is a sub-path of the new
+ path; we can dequeue the existing path and
+ update the new path instead */
+ g_free(current_uri);
+ else
+ /* move the existing path to the new queue */
+ inotify_queue = g_slist_prepend(inotify_queue,
+ current_uri);
+ }
+
+ inotify_queue = g_slist_prepend(inotify_queue, uri_utf8);
+}