lru_cache.h

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/*
 * Copyright (C) 2008-2010 Timothy D. Morgan
 *
 * 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; version 3 of the License.
 * 
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.  
 *
 * $Id: lru_cache.h 253 2011-06-13 02:27:42Z tim $
 */

#ifndef LRU_CACHE_H
#define LRU_CACHE_H

#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <talloc.h>

#include "compat.h"


struct lru_cache_element;
typedef struct lru_cache_element lru_cache_element; 

struct lru_cache_element
{
  void* index;
  uint32_t index_len;
  void* data;
  lru_cache_element* next;
  lru_cache_element* older;
  lru_cache_element* newer;
};


typedef struct _lru_cache
{
  uint32_t secret;
  uint32_t num_keys;
  uint32_t num_buckets;
  uint32_t max_keys;
  lru_cache_element* oldest;
  lru_cache_element* newest;
  lru_cache_element** table;
  bool talloc_data;
} lru_cache;


_EXPORT()
lru_cache* lru_cache_create(uint32_t max_keys, uint32_t secret);


_EXPORT()
lru_cache* lru_cache_create_ctx(void* talloc_ctx, uint32_t max_keys, 
                                uint32_t secret, bool talloc_data);


_EXPORT()
void lru_cache_destroy(lru_cache* ht);


_EXPORT()
bool lru_cache_update(lru_cache* ht, const void* index, 
                      uint32_t index_len, void* data);

_EXPORT()
void* lru_cache_find(lru_cache* ht, const void* index, 
                     uint32_t index_len);

_EXPORT()
bool lru_cache_remove(lru_cache* ht, const void* index, 
                      uint32_t index_len);

#endif