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/*
* 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);
}
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