未验证 提交 c2d46f42 编写于 作者: M Minglei Jin 提交者: GitHub

Merge pull request #13730 from taosdata/feature/lru

feat: the first round lru cache for last/last_row
/*
* Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
*
* This program is free software: you can use, redistribute, and/or modify
* it under the terms of the GNU Affero General Public License, version 3
* or later ("AGPL"), as published by the Free Software Foundation.
*
* 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.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _TD_UTIL_LRUCACHE_H_
#define _TD_UTIL_LRUCACHE_H_
#include "thash.h"
#ifdef __cplusplus
extern "C" {
#endif
typedef struct SLRUCache SLRUCache;
typedef void (*_taos_lru_deleter_t)(const void *key, size_t keyLen, void *value);
typedef struct LRUHandle LRUHandle;
typedef enum {
TAOS_LRU_PRIORITY_HIGH,
TAOS_LRU_PRIORITY_LOW
} LRUPriority;
typedef enum {
TAOS_LRU_STATUS_OK,
TAOS_LRU_STATUS_FAIL,
TAOS_LRU_STATUS_INCOMPLETE,
TAOS_LRU_STATUS_OK_OVERWRITTEN
} LRUStatus;
SLRUCache *taosLRUCacheInit(size_t capacity, int numShardBits, double highPriPoolRatio);
void taosLRUCacheCleanup(SLRUCache *cache);
LRUStatus taosLRUCacheInsert(SLRUCache *cache, const void *key, size_t keyLen, void *value, size_t charge,
_taos_lru_deleter_t deleter, LRUHandle **handle, LRUPriority priority);
LRUHandle *taosLRUCacheLookup(SLRUCache * cache, const void *key, size_t keyLen);
void taosLRUCacheErase(SLRUCache * cache, const void *key, size_t keyLen);
void taosLRUCacheEraseUnrefEntries(SLRUCache *cache);
bool taosLRUCacheRef(SLRUCache *cache, LRUHandle *handle);
bool taosLRUCacheRelease(SLRUCache *cache, LRUHandle *handle, bool eraseIfLastRef);
void* taosLRUCacheValue(SLRUCache *cache, LRUHandle *handle);
size_t taosLRUCacheGetUsage(SLRUCache *cache);
size_t taosLRUCacheGetPinnedUsage(SLRUCache *cache);
void taosLRUCacheSetCapacity(SLRUCache *cache, size_t capacity);
size_t taosLRUCacheGetCapacity(SLRUCache *cache);
void taosLRUCacheSetStrictCapacity(SLRUCache *cache, bool strict);
bool taosLRUCacheIsStrictCapacity(SLRUCache *cache);
#ifdef __cplusplus
}
#endif
#endif // _TD_UTIL_LRUCACHE_H_
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