e14f1c3b3b
databases. - Make nsswitch support caching. Submitted by: Michael Bushkov <bushman__at__rsu.ru> Sponsored by: Google Summer of Code 2005
138 lines
4.2 KiB
C
138 lines
4.2 KiB
C
/*-
|
|
* Copyright (c) 2005 Michael Bushkov <bushman@rsu.ru>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef __CACHED_CACHEPLCS_H__
|
|
#define __CACHED_CACHEPLCS_H__
|
|
|
|
#include <sys/queue.h>
|
|
#include <sys/time.h>
|
|
#include <stdlib.h>
|
|
|
|
/* common policy definitions */
|
|
#define CACHELIB_MAX_FREQUENCY 100
|
|
|
|
/*
|
|
* cache_policy_item_ represents some abstract cache element in the policy
|
|
* queue. connected_item pointers to the corresponding cache_policy_item_ in
|
|
* another policy queue.
|
|
*/
|
|
struct cache_policy_item_
|
|
{
|
|
char *key;
|
|
size_t key_size;
|
|
|
|
size_t request_count;
|
|
struct timeval last_request_time;
|
|
struct timeval creation_time;
|
|
|
|
struct cache_policy_item_ *connected_item;
|
|
};
|
|
|
|
/*
|
|
* cache_policy_ represents an abstract policy queue. It can be customized by
|
|
* setting appropriate function pointers
|
|
*/
|
|
struct cache_policy_
|
|
{
|
|
struct cache_policy_item_* (*create_item_func)();
|
|
void (*destroy_item_func)(struct cache_policy_item_ *);
|
|
|
|
void (*add_item_func)(struct cache_policy_ *,
|
|
struct cache_policy_item_ *);
|
|
void (*remove_item_func)(struct cache_policy_ *,
|
|
struct cache_policy_item_ *);
|
|
void (*update_item_func)(struct cache_policy_ *,
|
|
struct cache_policy_item_ *);
|
|
|
|
struct cache_policy_item_ *(*get_first_item_func)(
|
|
struct cache_policy_ *);
|
|
struct cache_policy_item_ *(*get_last_item_func)(
|
|
struct cache_policy_ *);
|
|
struct cache_policy_item_ *(*get_next_item_func)(
|
|
struct cache_policy_ *, struct cache_policy_item_ *);
|
|
struct cache_policy_item_ *(*get_prev_item_func)(
|
|
struct cache_policy_ *, struct cache_policy_item_ *);
|
|
};
|
|
|
|
/*
|
|
* LFU cache policy item "inherited" from cache_policy_item_ structure
|
|
*/
|
|
struct cache_lfu_policy_item_
|
|
{
|
|
struct cache_policy_item_ parent_data;
|
|
int frequency;
|
|
|
|
TAILQ_ENTRY(cache_lfu_policy_item_) entries;
|
|
};
|
|
|
|
TAILQ_HEAD(cache_lfu_policy_group_, cache_lfu_policy_item_);
|
|
|
|
/*
|
|
* LFU policy queue "inherited" from cache_policy_.
|
|
*/
|
|
struct cache_lfu_policy_
|
|
{
|
|
struct cache_policy_ parent_data;
|
|
struct cache_lfu_policy_group_ groups[CACHELIB_MAX_FREQUENCY];
|
|
};
|
|
|
|
/*
|
|
* LRU and FIFO policies item "inherited" from cache_policy_item_
|
|
*/
|
|
struct cache_queue_policy_item_
|
|
{
|
|
struct cache_policy_item_ parent_data;
|
|
TAILQ_ENTRY(cache_queue_policy_item_) entries;
|
|
};
|
|
|
|
/*
|
|
* LRU and FIFO policies "inherited" from cache_policy_
|
|
*/
|
|
struct cache_queue_policy_
|
|
{
|
|
struct cache_policy_ parent_data;
|
|
TAILQ_HEAD(cache_queue_policy_head_, cache_queue_policy_item_) head;
|
|
};
|
|
|
|
typedef struct cache_queue_policy_ cache_fifo_policy_;
|
|
typedef struct cache_queue_policy_ cache_lru_policy_;
|
|
|
|
/* fifo policy routines */
|
|
extern struct cache_policy_ *init_cache_fifo_policy();
|
|
extern void destroy_cache_fifo_policy(struct cache_policy_ *);
|
|
|
|
/* lru policy routines */
|
|
extern struct cache_policy_ *init_cache_lru_policy();
|
|
extern void destroy_cache_lru_policy(struct cache_policy_ *);
|
|
|
|
/* lfu policy routines */
|
|
extern struct cache_policy_ *init_cache_lfu_policy();
|
|
extern void destroy_cache_lfu_policy(struct cache_policy_ *);
|
|
|
|
#endif
|