/* * 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 "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); }