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