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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* GMime
* Copyright (C) 2000-2014 Jeffrey Stedfast
*
* 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, 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "cache.h"
static void
cache_node_free (gpointer node_data)
{
CacheNode *node = (CacheNode *) node_data;
Cache *cache = node->cache;
cache->free_node (node);
g_free (node->key);
g_slice_free1 (cache->node_size, node);
}
Cache *
cache_new (CacheNodeExpireFunc expire, CacheNodeFreeFunc free_node, size_t node_size, size_t max_size)
{
Cache *cache;
cache = g_new (Cache, 1);
list_init (&cache->list);
cache->expire = expire;
cache->free_node = free_node;
cache->node_hash = g_hash_table_new_full (g_str_hash, g_str_equal, NULL, cache_node_free);
cache->node_size = node_size;
cache->max_size = max_size;
cache->size = 0;
return cache;
}
void
cache_free (Cache *cache)
{
g_hash_table_destroy (cache->node_hash);
g_free (cache);
}
void
cache_expire_unused (Cache *cache)
{
ListNode *node, *prev;
node = cache->list.tailpred;
while (node->prev && cache->size > cache->max_size) {
prev = node->prev;
if (cache->expire (cache, (CacheNode *) node)) {
list_unlink (node);
g_hash_table_remove (cache->node_hash, ((CacheNode *) node)->key);
cache->size--;
}
node = prev;
}
}
CacheNode *
cache_node_insert (Cache *cache, const char *key)
{
CacheNode *node;
cache->size++;
if (cache->size > cache->max_size)
cache_expire_unused (cache);
node = g_slice_alloc (cache->node_size);
node->key = g_strdup (key);
node->cache = cache;
g_hash_table_insert (cache->node_hash, node->key, node);
list_prepend (&cache->list, (ListNode *) node);
return node;
}
CacheNode *
cache_node_lookup (Cache *cache, const char *key, gboolean use)
{
CacheNode *node;
node = g_hash_table_lookup (cache->node_hash, key);
if (node && use) {
list_unlink ((ListNode *) node);
list_prepend (&cache->list, (ListNode *) node);
}
return node;
}
void
cache_node_expire (CacheNode *node)
{
Cache *cache;
cache = node->cache;
list_unlink ((ListNode *) node);
g_hash_table_remove (cache->node_hash, node->key);
cache->size--;
}
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