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/*
* fm-file-monitor.c
*
* Copyright 2009 PCMan <pcman.tw@gmail.com>
*
* This file is a part of the Libfm library.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* SECTION:fm-monitor
* @short_description: File monitor cache implementation.
* @title: GMonitor cache
*
* @include: libfm/fm.h
*
* This implementation can help to exclude creation of duplicate monitors
* for the same file and also do fast search for created file monitors.
*/
#include "fm-monitor.h"
#include "fm-dummy-monitor.h"
#include <string.h>
#define MONITOR_RATE_LIMIT 5000
static GHashTable* hash = NULL;
static GHashTable* dummy_hash = NULL;
G_LOCK_DEFINE_STATIC(hash);
static void on_monitor_destroy(gpointer data, GObject* mon)
{
GFile* gf = (GFile*)data;
G_LOCK(hash);
g_hash_table_remove(hash, gf);
G_UNLOCK(hash);
}
static void on_dummy_monitor_destroy(gpointer data, GObject* mon)
{
GFile* gf = (GFile*)data;
G_LOCK(hash);
g_hash_table_remove(dummy_hash, gf);
G_UNLOCK(hash);
}
/**
* fm_monitor_directory
* @gf: file to monitor
* @err: (allow-none) (out): location to save error
*
* Finds a monitor for directory @gf in cache or creates new if there is
* no such monitor created yet.
*
* Returns: (transfer full): a monitor object.
*
* Since: 0.1.0
*/
GFileMonitor* fm_monitor_directory(GFile* gf, GError** err)
{
GFileMonitor* ret = NULL;
G_LOCK(hash);
ret = (GFileMonitor*)g_hash_table_lookup(hash, gf);
if(!ret && !g_file_is_native(gf))
ret = (GFileMonitor*)g_hash_table_lookup(dummy_hash, gf);
if(ret)
g_object_ref(ret);
else
{
GError* e = NULL;
ret = g_file_monitor_directory(gf, G_FILE_MONITOR_WATCH_MOUNTS, NULL, &e);
if(ret)
{
g_object_weak_ref(G_OBJECT(ret), on_monitor_destroy, gf);
g_file_monitor_set_rate_limit(ret, MONITOR_RATE_LIMIT);
g_hash_table_insert(hash, g_object_ref(gf), ret);
}
else
{
if(e)
{
if(e->domain == G_IO_ERROR && e->code == G_IO_ERROR_NOT_SUPPORTED)
{
/* create a fake file monitor */
ret = fm_dummy_monitor_new();
g_error_free(e);
g_object_weak_ref(G_OBJECT(ret), on_dummy_monitor_destroy, gf);
g_hash_table_insert(dummy_hash, g_object_ref(gf), ret);
}
else
{
g_debug("error creating file monitor: %s", e->message);
G_UNLOCK(hash);
if(err)
*err = e;
else
g_error_free(e);
return NULL;
}
}
}
}
G_UNLOCK(hash);
return ret;
}
void _fm_monitor_init()
{
hash = g_hash_table_new_full(g_file_hash, (GEqualFunc)g_file_equal, g_object_unref, NULL);
dummy_hash = g_hash_table_new_full(g_file_hash, (GEqualFunc)g_file_equal, g_object_unref, NULL);
}
void _fm_monitor_finalize()
{
g_hash_table_destroy(hash);
g_hash_table_destroy(dummy_hash);
hash = NULL;
dummy_hash = NULL;
}
/**
* fm_monitor_lookup_monitor
* @gf: file to monitor
*
* Finds a monitor for directory @gf in cache.
*
* Returns: (transfer full): a monitor object or %NULL.
*
* Since: 0.1.0
*/
GFileMonitor* fm_monitor_lookup_monitor(GFile* gf)
{
GFileMonitor* ret = NULL;
if(G_UNLIKELY(!gf))
return NULL;
G_LOCK(hash);
ret = (GFileMonitor*)g_hash_table_lookup(hash, gf);
if(!ret && !g_file_is_native(gf))
ret = (GFileMonitor*)g_hash_table_lookup(dummy_hash, gf);
if(ret)
g_object_ref(ret);
G_UNLOCK(hash);
return ret;
}
/**
* fm_monitor_lookup_dummy_monitor
* @gf: file to monitor
*
* Finds a monitor for not-native file @gf in cache.
*
* Returns: (transfer full): a monitor object or %NULL.
*
* Since: 0.1.0
*/
GFileMonitor* fm_monitor_lookup_dummy_monitor(GFile* gf)
{
GFileMonitor* mon;
char* scheme;
if(G_LIKELY(!gf || g_file_is_native(gf)))
return NULL;
scheme = g_file_get_uri_scheme(gf);
if(scheme)
{
/* those URI schemes don't need dummy monitor */
if(strcmp(scheme, "trash") == 0
|| strcmp(scheme, "computer") == 0
|| strcmp(scheme, "network") == 0
|| strcmp(scheme, "applications") == 0)
{
g_free(scheme);
return NULL;
}
g_free(scheme);
}
G_LOCK(hash);
mon = (GFileMonitor*)g_hash_table_lookup(dummy_hash, gf);
if(mon)
g_object_ref(mon);
else
{
/* create a fake file monitor */
mon = fm_dummy_monitor_new();
g_object_weak_ref(G_OBJECT(mon), on_dummy_monitor_destroy, gf);
g_hash_table_insert(dummy_hash, g_object_ref(gf), mon);
}
G_UNLOCK(hash);
return mon;
}
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