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/* foundry-path-cache.c
*
* Copyright 2022-2024 Christian Hergert <chergert@redhat.com>
*
* 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 General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include "config.h"
#include "foundry-path-cache.h"
/**
* FoundryPathCache:
*
* Thread-safe cache for path lookups
*
* #FoundryPathCache can be used to cache path lookup entries as often
* needed by runtimes.
*
* This object is thread-safe and may be accessed from multiple
* threads simultaneously.
*/
struct _FoundryPathCache
{
GObject parent_instance;
GMutex mutex;
GHashTable *cache;
};
G_DEFINE_FINAL_TYPE (FoundryPathCache, foundry_path_cache, G_TYPE_OBJECT)
static void
foundry_path_cache_dispose (GObject *object)
{
FoundryPathCache *self = (FoundryPathCache *)object;
g_mutex_lock (&self->mutex);
g_hash_table_remove_all (self->cache);
g_mutex_unlock (&self->mutex);
G_OBJECT_CLASS (foundry_path_cache_parent_class)->dispose (object);
}
static void
foundry_path_cache_finalize (GObject *object)
{
FoundryPathCache *self = (FoundryPathCache *)object;
g_clear_pointer (&self->cache, g_hash_table_unref);
g_mutex_clear (&self->mutex);
G_OBJECT_CLASS (foundry_path_cache_parent_class)->finalize (object);
}
static void
foundry_path_cache_class_init (FoundryPathCacheClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->dispose = foundry_path_cache_dispose;
object_class->finalize = foundry_path_cache_finalize;
}
static void
foundry_path_cache_init (FoundryPathCache *self)
{
g_mutex_init (&self->mutex);
self->cache = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free);
}
FoundryPathCache *
foundry_path_cache_new (void)
{
return g_object_new (FOUNDRY_TYPE_PATH_CACHE, NULL);
}
/**
* foundry_path_cache_lookup:
* @self: a #FoundryPathCache
* @program_name: the program name to lookup
* @program_path: (out) (transfer full) (nullable): a location to store
* the @program_path for @program_name.
*
* %TRUE is returned when an entry is found in the cache. That entry
* may be %NULL indicating a negative cache entry.
*
* Returns: %TRUE if @program_name was found and @program_path is set;
* otherwise %FALSE is returned.
*/
gboolean
foundry_path_cache_lookup (FoundryPathCache *self,
const char *program_name,
char **program_path)
{
const char *path = NULL;
gboolean ret;
g_return_val_if_fail (FOUNDRY_IS_PATH_CACHE (self), FALSE);
g_return_val_if_fail (program_name, FALSE);
g_mutex_lock (&self->mutex);
ret = g_hash_table_lookup_extended (self->cache, program_name, NULL, (gpointer *)&path);
if (program_path != NULL)
*program_path = path ? g_strdup (path) : NULL;
g_mutex_unlock (&self->mutex);
return ret;
}
/**
* foundry_path_cache_contains:
* @self: a #FoundryPathCache
* @program_name: the name of the program to lookup
* @had_program_path: (out) (nullable): a location to store if a path
* was found for @program_name.
*
* This function helps for detecting negative cache entries without
* copying the program_path string.
*
* Returns: %TRUE if an entry was found and @had_program_path is set;
* otherwise %FALSE.
*/
gboolean
foundry_path_cache_contains (FoundryPathCache *self,
const char *program_name,
gboolean *had_program_path)
{
const char *path = NULL;
gboolean ret;
g_return_val_if_fail (FOUNDRY_IS_PATH_CACHE (self), FALSE);
g_return_val_if_fail (program_name, FALSE);
g_mutex_lock (&self->mutex);
ret = g_hash_table_lookup_extended (self->cache, program_name, NULL, (gpointer *)&path);
if (had_program_path)
*had_program_path = path != NULL;
g_mutex_unlock (&self->mutex);
return ret;
}
/**
* foundry_path_cache_insert:
* @self: a #FoundryPathCache
* @program_name: the name of the program
* @program_path: (nullable): the path for the program
*
* Inserts a cache entry for @program_name for @program_path.
*
* @program_path may be %NULL to register a negative cache entry. See
* foundry_path_cache_lookup() for handling negative cache entries.
*/
void
foundry_path_cache_insert (FoundryPathCache *self,
const char *program_name,
const char *program_path)
{
char *key;
char *value;
g_return_if_fail (FOUNDRY_IS_PATH_CACHE (self));
g_return_if_fail (program_name != NULL);
key = g_strdup (program_name);
value = g_strdup (program_path);
g_mutex_lock (&self->mutex);
g_hash_table_insert (self->cache, key, value);
g_mutex_unlock (&self->mutex);
}
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