165 lines
3.9 KiB
C
165 lines
3.9 KiB
C
/*
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* Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
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*
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* This program is free software: you can use, redistribute, and/or modify
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* it under the terms of the GNU Affero General Public License, version 3
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* or later ("AGPL"), as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef TDENGINE_HASH_H
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#define TDENGINE_HASH_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "hashfunc.h"
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#define HASH_MAX_CAPACITY (1024 * 1024 * 16)
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#define HASH_DEFAULT_LOAD_FACTOR (0.75)
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#define HASH_INDEX(v, c) ((v) & ((c)-1))
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typedef void (*_hash_free_fn_t)(void *param);
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typedef struct SHashNode {
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char *key;
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struct SHashNode *prev;
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struct SHashNode *next;
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uint32_t hashVal; // the hash value of key, if hashVal == HASH_VALUE_IN_TRASH, this node is moved to trash
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uint32_t keyLen; // length of the key
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char *data;
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} SHashNode;
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typedef struct SHashObj {
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SHashNode **hashList;
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size_t capacity; // number of slots
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size_t size; // number of elements in hash table
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_hash_fn_t hashFp; // hash function
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_hash_free_fn_t freeFp; // hash node free callback function
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bool enableUpdate; // enable update
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#if defined(LINUX)
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pthread_rwlock_t *lock;
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#else
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pthread_mutex_t *lock;
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#endif
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} SHashObj;
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typedef struct SHashMutableIterator {
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SHashObj * pHashObj;
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int32_t entryIndex;
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SHashNode *pCur;
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SHashNode *pNext; // current node can be deleted for mutable iterator, so keep the next one before return current
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int32_t num; // already check number of elements in hash table
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} SHashMutableIterator;
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/**
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* init the hash table
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*
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* @param capacity initial capacity of the hash table
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* @param fn hash function to generate the hash value
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* @param threadsafe thread safe or not
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* @return
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*/
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SHashObj *taosHashInit(size_t capacity, _hash_fn_t fn, bool update, bool threadsafe);
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/**
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* return the size of hash table
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* @param pHashObj
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* @return
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*/
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size_t taosHashGetSize(const SHashObj *pHashObj);
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/**
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* put element into hash table, if the element with the same key exists, update it
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* @param pHashObj
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* @param key
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* @param keyLen
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* @param data
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* @param size
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* @return
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*/
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int32_t taosHashPut(SHashObj *pHashObj, const void *key, size_t keyLen, void *data, size_t size);
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/**
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* return the payload data with the specified key
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*
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* @param pHashObj
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* @param key
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* @param keyLen
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* @return
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*/
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void *taosHashGet(SHashObj *pHashObj, const void *key, size_t keyLen);
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/**
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* remove item with the specified key
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* @param pHashObj
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* @param key
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* @param keyLen
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*/
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int32_t taosHashRemove(SHashObj *pHashObj, const void *key, size_t keyLen);
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void* taosHashRemoveNode(SHashObj *pHashObj, const void *key, size_t keyLen);
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/**
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* clean up hash table
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* @param handle
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*/
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void taosHashCleanup(SHashObj *pHashObj);
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/**
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* Set the free callback function
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* This function if set will be invoked right before freeing each hash node
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* @param pHashObj
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*/
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void taosHashSetFreecb(SHashObj *pHashObj, _hash_free_fn_t freeFp);
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/**
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*
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* @param pHashObj
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* @return
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*/
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SHashMutableIterator* taosHashCreateIter(SHashObj *pHashObj);
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/**
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*
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* @param iter
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* @return
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*/
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bool taosHashIterNext(SHashMutableIterator *iter);
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/**
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*
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* @param iter
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* @return
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*/
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void *taosHashIterGet(SHashMutableIterator *iter);
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/**
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*
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* @param iter
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* @return
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*/
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void* taosHashDestroyIter(SHashMutableIterator* iter);
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/**
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*
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* @param pHashObj
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* @return
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*/
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int32_t taosHashGetMaxOverflowLinkLength(const SHashObj *pHashObj);
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#ifdef __cplusplus
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}
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#endif
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#endif // TDENGINE_HASH_H
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