63 lines
1.1 KiB
C
63 lines
1.1 KiB
C
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#include <uthash.h>
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#include "utils.h"
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#include "cache.h"
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struct cache_entry {
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char *key;
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void *value;
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UT_hash_handle hh;
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};
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struct cache {
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cache_getter_t getter;
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cache_free_t free;
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void *user_data;
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struct cache_entry *entries;
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};
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void *cache_get(struct cache *c, const char *key) {
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struct cache_entry *e;
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HASH_FIND_STR(c->entries, key, e);
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if (e) {
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return e->value;
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}
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e = ccalloc(1, struct cache_entry);
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e->key = strdup(key);
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e->value = c->getter(c->user_data, key);
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HASH_ADD_STR(c->entries, key, e);
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return e->value;
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}
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static inline void _cache_invalidate(struct cache *c, struct cache_entry *e) {
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if (c->free) {
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c->free(c->user_data, e->value);
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}
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HASH_DEL(c->entries, e);
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free(e);
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}
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void cache_invalidate(struct cache *c, const char *key) {
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struct cache_entry *e;
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HASH_FIND_STR(c->entries, key, e);
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if (e) {
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_cache_invalidate(c, e);
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}
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}
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void cache_invalidate_all(struct cache *c) {
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struct cache_entry *e, *tmpe;
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HASH_ITER(hh, c->entries, e, tmpe) {
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_cache_invalidate(c, e);
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}
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}
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void *cache_free(struct cache *c) {
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void *ret = c->user_data;
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cache_invalidate_all(c);
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free(c);
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return ret;
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}
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