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提交 81bd97ca 编写于 作者: H hjxilinx
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add iterator for skiplist

上级 c1d33817
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Showing with 95 addition and 1064 deletion
src/util/inc/sskiplist.h 已删除 100644 → 0
浏览文件 @ c1d33817
/*
* 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/>.
*/
#if 0
#ifndef TBASE_TSKIPLIST_H
#define TBASE_TSKIPLIST_H
#ifdef __cplusplus
extern "C" {
#endif
#define MAX_SKIP_LIST_LEVEL 20
#include <pthread.h>
#include <stdint.h>
#include <stdlib.h>
#include "os.h"
#include "taosdef.h"
/*
* key of each node
* todo move to as the global structure in all search codes...
*/
const static size_t SKIP_LIST_STR_KEY_LENGTH_THRESHOLD = 15;
typedef tVariant tSkipListKey;
typedef enum tSkipListPointQueryType {
INCLUDE_POINT_QUERY,
EXCLUDE_POINT_QUERY,
} tSkipListPointQueryType;
typedef struct tSkipListNode {
uint16_t nLevel;
char * pData;
struct tSkipListNode **pForward;
struct tSkipListNode **pBackward;
tSkipListKey key;
} tSkipListNode;
/*
* @version 0.2
* @date 2017/11/12
* the simple version of SkipList.
* for multi-thread safe purpose, we employ pthread_rwlock_t to guarantee to generate
* deterministic result. Later, we will remove the lock in SkipList to further
* enhance the performance. In this case, one should use the concurrent skip list (by
* using michael-scott algorithm) instead of this simple version in a multi-thread
* environment, to achieve higher performance of read/write operations.
*
* Note: Duplicated primary key situation.
* In case of duplicated primary key, two ways can be employed to handle this situation:
* 1. add as normal insertion with out special process.
* 2. add an overflow pointer at each list node, all nodes with the same key will be added
* in the overflow pointer. In this case, the total steps of each search will be reduced significantly.
* Currently, we implement the skip list in a line with the first means, maybe refactor it soon.
*
* Memory consumption: the memory alignment causes many memory wasted. So, employ a memory
* pool will significantly reduce the total memory consumption, as well as the calloc/malloc operation costs.
*
* 3. use the iterator pattern to refactor all routines to make it more clean
*/
// state struct, record following information:
// number of links in each level.
// avg search steps, for latest 1000 queries
// avg search rsp time, for latest 1000 queries
// total memory size
typedef struct tSkipListState {
// in bytes, sizeof(tSkipList)+sizeof(tSkipListNode)*tSkipList->nSize
uint64_t nTotalMemSize;
uint64_t nLevelNodeCnt[MAX_SKIP_LIST_LEVEL];
uint64_t queryCount; // total query count
/*
* only record latest 1000 queries
* when the value==1000, = 0,
* nTotalStepsForQueries = 0,
* nTotalElapsedTimeForQueries = 0
*/
uint64_t nRecQueries;
uint16_t nTotalStepsForQueries;
uint64_t nTotalElapsedTimeForQueries;
uint16_t nInsertObjs;
uint16_t nTotalStepsForInsert;
uint64_t nTotalElapsedTimeForInsert;
} tSkipListState;
typedef struct tSkipList {
tSkipListNode pHead;
uint64_t nSize;
uint16_t nMaxLevel;
uint16_t nLevel;
uint16_t keyType;
uint16_t nMaxKeyLen;
__compar_fn_t comparator;
pthread_rwlock_t lock; // will be removed soon
tSkipListState state; // skiplist state
} tSkipList;
/*
* iterate the skiplist
* this will cause the multi-thread problem, when the skiplist is destroyed, the iterate may
* continue iterating the skiplist, so add the reference count for skiplist
* TODO add the ref for skiplist when one iterator is created
*/
typedef struct SSkipListIterator {
tSkipList * pSkipList;
tSkipListNode *cur;
int64_t num;
} SSkipListIterator;
/*
* query condition structure to denote the range query
* todo merge the point query cond with range query condition
*/
typedef struct tSKipListQueryCond {
// when the upper bounding == lower bounding, it is a point query
tSkipListKey lowerBnd;
tSkipListKey upperBnd;
int32_t lowerBndRelOptr; // relation operator to denote if lower bound is
int32_t upperBndRelOptr; // included or not
} tSKipListQueryCond;
tSkipList *SSkipListCreate(int16_t nMaxLevel, int16_t keyType, int16_t nMaxKeyLen);
void *SSkipListDestroy(tSkipList *pSkipList);
// create skip list key
tSkipListKey SSkipListCreateKey(int32_t type, char *val, size_t keyLength);
// destroy skip list key
void tSkipListDestroyKey(tSkipListKey *pKey);
// put data into skiplist
tSkipListNode *SSkipListPut(tSkipList *pSkipList, void *pData, tSkipListKey *pKey, int32_t insertIdenticalKey);
/*
* get only *one* node of which key is equalled to pKey, even there are more
* than one nodes are of the same key
*/
tSkipListNode *tSkipListGetOne(tSkipList *pSkipList, tSkipListKey *pKey);
/*
* get all data with the same keys
*/
int32_t tSkipListGets(tSkipList *pSkipList, tSkipListKey *pKey, tSkipListNode ***pRes);
int32_t tSkipListIterateList(tSkipList *pSkipList, tSkipListNode ***pRes, bool (*fp)(tSkipListNode *, void *),
void *param);
/*
* remove only one node of the pKey value.
* If more than one node has the same value, any one will be removed
*
* @Return
* true: one node has been removed
* false: no node has been removed
*/
bool tSkipListRemove(tSkipList *pSkipList, tSkipListKey *pKey);
/*
* remove the specified node in parameters
*/
void tSkipListRemoveNode(tSkipList *pSkipList, tSkipListNode *pNode);
// for debug purpose only
void SSkipListPrint(tSkipList *pSkipList, int16_t nlevel);
/*
* range query & single point query function
*/
int32_t tSkipListQuery(tSkipList *pSkipList, tSKipListQueryCond *pQueryCond, tSkipListNode ***pResult);
/*
* include/exclude point query
*/
int32_t tSkipListPointQuery(tSkipList *pSkipList, tSkipListKey *pKey, int32_t numOfKey, tSkipListPointQueryType type,
tSkipListNode ***pResult);
int32_t tSkipListIteratorReset(tSkipList *pSkipList, SSkipListIterator *iter);
bool tSkipListIteratorNext(SSkipListIterator *iter);
tSkipListNode *tSkipListIteratorGet(SSkipListIterator *iter);
#ifdef __cplusplus
}
#endif
#endif // TBASE_TSKIPLIST_H
#endif
\ No newline at end of file
src/util/inc/tskiplist.h
浏览文件 @ 81bd97ca
......@@ -185,15 +185,39 @@ SSkipListNode *tSkipListPut(SSkipList *pSkipList, SSkipListNode *pNode);
SArray* tSkipListGet(SSkipList *pSkipList, SSkipListKey pKey, int16_t keyType);
/**
*
* get the size of skip list
* @param pSkipList
* @param pRes
* @param fp
* @param param
* @return
*/
int32_t tSkipListIterateList(SSkipList *pSkipList, SSkipListNode ***pRes, bool (*fp)(SSkipListNode *, void *),
void *param);
size_t tSkipListGetSize(const SSkipList* pSkipList);
/**
* create skiplist iterator
* @param pSkipList
* @return
*/
SSkipListIterator* tSkipListCreateIter(SSkipList *pSkipList);
/**
* forward the skip list iterator
* @param iter
* @return
*/
bool tSkipListIterNext(SSkipListIterator *iter);
/**
* get the element of skip list node
* @param iter
* @return
*/
SSkipListNode *tSkipListIterGet(SSkipListIterator *iter);
/**
* destroy the skip list node
* @param iter
* @return
*/
void* tSkipListDestroyIter(SSkipListIterator* iter);
/*
* remove only one node of the pKey value.
......@@ -210,9 +234,6 @@ bool tSkipListRemove(SSkipList *pSkipList, SSkipListKey *pKey);
*/
void tSkipListRemoveNode(SSkipList *pSkipList, SSkipListNode *pNode);
int32_t tSkipListIteratorReset(SSkipList *pSkipList, SSkipListIterator *iter);
bool tSkipListIteratorNext(SSkipListIterator *iter);
SSkipListNode *tSkipListIteratorGet(SSkipListIterator *iter);
#ifdef __cplusplus
}
......
src/util/src/sskiplist.c 已删除 100644 → 0
浏览文件 @ c1d33817
/*
* 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/>.
*/
#if 0
#include "os.h"
#include "tlog.h"
#include "taosdef.h"
#include "sskiplist.h"
#include "tutil.h"
static FORCE_INLINE void recordNodeEachLevel(tSkipList *pSkipList, int32_t nLevel) { // record link count in each level
for (int32_t i = 0; i < nLevel; ++i) {
pSkipList->state.nLevelNodeCnt[i]++;
}
}
static FORCE_INLINE void removeNodeEachLevel(tSkipList *pSkipList, int32_t nLevel) {
for (int32_t i = 0; i < nLevel; ++i) {
pSkipList->state.nLevelNodeCnt[i]--;
}
}
static FORCE_INLINE int32_t getSkipListNodeRandomHeight(tSkipList *pSkipList) {
const uint32_t factor = 4;
int32_t n = 1;
while ((rand() % factor) == 0 && n <= pSkipList->nMaxLevel) {
n++;
}
return n;
}
static FORCE_INLINE int32_t getSkipListNodeLevel(tSkipList *pSkipList) {
int32_t nLevel = getSkipListNodeRandomHeight(pSkipList);
if (pSkipList->nSize == 0) {
nLevel = 1;
pSkipList->nLevel = 1;
} else {
if (nLevel > pSkipList->nLevel && pSkipList->nLevel < pSkipList->nMaxLevel) {
nLevel = (++pSkipList->nLevel);
}
}
return nLevel;
}
void tSkipListDoInsert(tSkipList *pSkipList, tSkipListNode **forward, int32_t nLevel, tSkipListNode *pNode);
void SSkipListDoRecordPut(tSkipList *pSkipList) {
const int32_t MAX_RECORD_NUM = 1000;
if (pSkipList->state.nInsertObjs == MAX_RECORD_NUM) {
pSkipList->state.nInsertObjs = 1;
pSkipList->state.nTotalStepsForInsert = 0;
pSkipList->state.nTotalElapsedTimeForInsert = 0;
} else {
pSkipList->state.nInsertObjs++;
}
}
int32_t compareIntVal(const void *pLeft, const void *pRight) {
int64_t lhs = ((tSkipListKey *)pLeft)->i64Key;
int64_t rhs = ((tSkipListKey *)pRight)->i64Key;
DEFAULT_COMP(lhs, rhs);
}
int32_t scompareIntDoubleVal(const void *pLeft, const void *pRight) {
int64_t lhs = ((tSkipListKey *)pLeft)->i64Key;
double rhs = ((tSkipListKey *)pRight)->dKey;
if (fabs(lhs - rhs) < FLT_EPSILON) {
return 0;
} else {
return (lhs > rhs) ? 1 : -1;
}
}
int32_t scompareDoubleIntVal(const void *pLeft, const void *pRight) {
double lhs = ((tSkipListKey *)pLeft)->dKey;
int64_t rhs = ((tSkipListKey *)pRight)->i64Key;
if (fabs(lhs - rhs) < FLT_EPSILON) {
return 0;
} else {
return (lhs > rhs) ? 1 : -1;
}
}
int32_t scompareDoubleVal(const void *pLeft, const void *pRight) {
double ret = (((tSkipListKey *)pLeft)->dKey - ((tSkipListKey *)pRight)->dKey);
if (fabs(ret) < FLT_EPSILON) {
return 0;
} else {
return ret > 0 ? 1 : -1;
}
}
int32_t scompareStrVal(const void *pLeft, const void *pRight) {
tSkipListKey *pL = (tSkipListKey *)pLeft;
tSkipListKey *pR = (tSkipListKey *)pRight;
if (pL->nLen == 0 && pR->nLen == 0) {
return 0;
}
//handle only one-side bound compare situation, there is only lower bound or only upper bound
if (pL->nLen == -1) {
return 1; // no lower bound, lower bound is minimum, always return -1;
} else if (pR->nLen == -1) {
return -1; // no upper bound, upper bound is maximum situation, always return 1;
}
int32_t ret = strcmp(((tSkipListKey *)pLeft)->pz, ((tSkipListKey *)pRight)->pz);
if (ret == 0) {
return 0;
} else {
return ret > 0 ? 1 : -1;
}
}
int32_t scompareWStrVal(const void *pLeft, const void *pRight) {
tSkipListKey *pL = (tSkipListKey *)pLeft;
tSkipListKey *pR = (tSkipListKey *)pRight;
if (pL->nLen == 0 && pR->nLen == 0) {
return 0;
}
//handle only one-side bound compare situation, there is only lower bound or only upper bound
if (pL->nLen == -1) {
return 1; // no lower bound, lower bound is minimum, always return -1;
} else if (pR->nLen == -1) {
return -1; // no upper bound, upper bound is maximum situation, always return 1;
}
int32_t ret = wcscmp(((tSkipListKey *)pLeft)->wpz, ((tSkipListKey *)pRight)->wpz);
if (ret == 0) {
return 0;
} else {
return ret > 0 ? 1 : -1;
}
}
static __compar_fn_t getKeyFilterComparator(tSkipList *pSkipList, int32_t filterDataType) {
__compar_fn_t comparator = NULL;
switch (pSkipList->keyType) {
case TSDB_DATA_TYPE_TINYINT:
case TSDB_DATA_TYPE_SMALLINT:
case TSDB_DATA_TYPE_INT:
case TSDB_DATA_TYPE_BIGINT:
case TSDB_DATA_TYPE_BOOL: {
if (filterDataType >= TSDB_DATA_TYPE_BOOL && filterDataType <= TSDB_DATA_TYPE_BIGINT) {
comparator = compareIntVal;
} else if (filterDataType >= TSDB_DATA_TYPE_FLOAT && filterDataType <= TSDB_DATA_TYPE_DOUBLE) {
comparator = scompareIntDoubleVal;
}
break;
}
case TSDB_DATA_TYPE_FLOAT:
case TSDB_DATA_TYPE_DOUBLE: {
if (filterDataType >= TSDB_DATA_TYPE_BOOL && filterDataType <= TSDB_DATA_TYPE_BIGINT) {
comparator = scompareDoubleIntVal;
} else if (filterDataType >= TSDB_DATA_TYPE_FLOAT && filterDataType <= TSDB_DATA_TYPE_DOUBLE) {
comparator = scompareDoubleVal;
}
break;
}
case TSDB_DATA_TYPE_BINARY:
comparator = scompareStrVal;
break;
case TSDB_DATA_TYPE_NCHAR:
comparator = scompareWStrVal;
break;
default:
comparator = compareIntVal;
break;
}
return comparator;
}
static __compar_fn_t getKeyComparator(int32_t keyType) {
__compar_fn_t comparator = NULL;
switch (keyType) {
case TSDB_DATA_TYPE_TINYINT:
case TSDB_DATA_TYPE_SMALLINT:
case TSDB_DATA_TYPE_INT:
case TSDB_DATA_TYPE_BIGINT:
case TSDB_DATA_TYPE_BOOL:
comparator = compareIntVal;
break;
case TSDB_DATA_TYPE_FLOAT:
case TSDB_DATA_TYPE_DOUBLE:
comparator = scompareDoubleVal;
break;
case TSDB_DATA_TYPE_BINARY:
comparator = scompareStrVal;
break;
case TSDB_DATA_TYPE_NCHAR:
comparator = scompareWStrVal;
break;
default:
comparator = compareIntVal;
break;
}
return comparator;
}
tSkipList* SSkipListCreate(int16_t nMaxLevel, int16_t keyType, int16_t nMaxKeyLen) {
tSkipList *pSkipList = (tSkipList *)calloc(1, sizeof(tSkipList));
if (pSkipList == NULL) {
return NULL;
}
pSkipList->keyType = keyType;
pSkipList->comparator = getKeyComparator(keyType);
pSkipList->pHead.pForward = (tSkipListNode **)calloc(1, POINTER_BYTES * MAX_SKIP_LIST_LEVEL);
pSkipList->nMaxLevel = MAX_SKIP_LIST_LEVEL;
pSkipList->nLevel = 1;
pSkipList->nMaxKeyLen = nMaxKeyLen;
pSkipList->nMaxLevel = nMaxLevel;
if (pthread_rwlock_init(&pSkipList->lock, NULL) != 0) {
tfree(pSkipList->pHead.pForward);
tfree(pSkipList);
return NULL;
}
srand(time(NULL));
pSkipList->state.nTotalMemSize += sizeof(tSkipList);
return pSkipList;
}
static void doRemove(tSkipList *pSkipList, tSkipListNode *pNode, tSkipListNode *forward[]) {
int32_t level = pNode->nLevel;
for (int32_t j = level - 1; j >= 0; --j) {
if ((forward[j]->pForward[j] != NULL) && (forward[j]->pForward[j]->pForward[j])) {
forward[j]->pForward[j]->pForward[j]->pBackward[j] = forward[j];
}
if (forward[j]->pForward[j] != NULL) {
forward[j]->pForward[j] = forward[j]->pForward[j]->pForward[j];
}
}
pSkipList->state.nTotalMemSize -= (sizeof(tSkipListNode) + POINTER_BYTES * pNode->nLevel * 2);
removeNodeEachLevel(pSkipList, pNode->nLevel);
tfree(pNode);
--pSkipList->nSize;
}
static size_t getOneNodeSize(const tSkipListKey *pKey, int32_t nLevel) {
size_t size = sizeof(tSkipListNode) + sizeof(intptr_t) * (nLevel << 1);
if (pKey->nType == TSDB_DATA_TYPE_BINARY) {
size += pKey->nLen + 1;
} else if (pKey->nType == TSDB_DATA_TYPE_NCHAR) {
size += (pKey->nLen + 1) * TSDB_NCHAR_SIZE;
}
return size;
}
static tSkipListNode *SSkipListCreateNode(void *pData, const tSkipListKey *pKey, int32_t nLevel) {
size_t nodeSize = getOneNodeSize(pKey, nLevel);
tSkipListNode *pNode = (tSkipListNode *)calloc(1, nodeSize);
pNode->pForward = (tSkipListNode **)(&pNode[1]);
pNode->pBackward = (pNode->pForward + nLevel);
pNode->pData = pData;
pNode->key = *pKey;
if (pKey->nType == TSDB_DATA_TYPE_BINARY) {
pNode->key.pz = (char *)(pNode->pBackward + nLevel);
strcpy(pNode->key.pz, pKey->pz);
pNode->key.pz[pKey->nLen] = 0;
} else if (pKey->nType == TSDB_DATA_TYPE_NCHAR) {
pNode->key.wpz = (wchar_t *)(pNode->pBackward + nLevel);
wcsncpy(pNode->key.wpz, pKey->wpz, pKey->nLen);
pNode->key.wpz[pKey->nLen] = 0;
}
pNode->nLevel = nLevel;
return pNode;
}
tSkipListKey SSkipListCreateKey(int32_t type, char *val, size_t keyLength) {
tSkipListKey k = {0};
tVariantCreateFromBinary(&k, val, (uint32_t) keyLength, (uint32_t) type);
return k;
}
void tSkipListDestroyKey(tSkipListKey *pKey) { tVariantDestroy(pKey); }
void* SSkipListDestroy(tSkipList *pSkipList) {
if (pSkipList == NULL) {
return NULL;
}
pthread_rwlock_wrlock(&pSkipList->lock);
tSkipListNode *pNode = pSkipList->pHead.pForward[0];
while (pNode) {
tSkipListNode *pTemp = pNode;
pNode = pNode->pForward[0];
tfree(pTemp);
}
tfree(pSkipList->pHead.pForward);
pthread_rwlock_unlock(&pSkipList->lock);
pthread_rwlock_destroy(&pSkipList->lock);
tfree(pSkipList);
return NULL;
}
tSkipListNode *SSkipListPut(tSkipList *pSkipList, void *pData, tSkipListKey *pKey, int32_t insertIdenticalKey) {
if (pSkipList == NULL) {
return NULL;
}
pthread_rwlock_wrlock(&pSkipList->lock);
// record one node is put into skiplist
SSkipListDoRecordPut(pSkipList);
tSkipListNode *px = &pSkipList->pHead;
tSkipListNode *forward[MAX_SKIP_LIST_LEVEL] = {0};
for (int32_t i = pSkipList->nLevel - 1; i >= 0; --i) {
while (px->pForward[i] != NULL && (pSkipList->comparator(&px->pForward[i]->key, pKey) < 0)) {
px = px->pForward[i];
}
pSkipList->state.nTotalStepsForInsert++;
forward[i] = px;
}
// if the skiplist does not allowed identical key inserted, the new data will be discarded.
if ((insertIdenticalKey == 0) && forward[0] != &pSkipList->pHead &&
(pSkipList->comparator(&forward[0]->key, pKey) == 0)) {
pthread_rwlock_unlock(&pSkipList->lock);
return forward[0];
}
int32_t nLevel = getSkipListNodeLevel(pSkipList);
recordNodeEachLevel(pSkipList, nLevel);
tSkipListNode *pNode = SSkipListCreateNode(pData, pKey, nLevel);
tSkipListDoInsert(pSkipList, forward, nLevel, pNode);
pSkipList->nSize += 1;
// char tmpstr[512] = {0};
// tVariantToString(&pNode->key, tmpstr);
// pTrace("skiplist:%p, node added, key:%s, total list len:%d", pSkipList,
// tmpstr, pSkipList->nSize);
pSkipList->state.nTotalMemSize += getOneNodeSize(pKey, nLevel);
pthread_rwlock_unlock(&pSkipList->lock);
return pNode;
}
void tSkipListDoInsert(tSkipList *pSkipList, tSkipListNode **forward, int32_t nLevel, tSkipListNode *pNode) {
for (int32_t i = 0; i < nLevel; ++i) {
tSkipListNode *x = forward[i];
if (x != NULL) {
pNode->pBackward[i] = x;
if (x->pForward[i]) x->pForward[i]->pBackward[i] = pNode;
pNode->pForward[i] = x->pForward[i];
x->pForward[i] = pNode;
} else {
pSkipList->pHead.pForward[i] = pNode;
pNode->pBackward[i] = &(pSkipList->pHead);
}
}
}
tSkipListNode *tSkipListGetOne(tSkipList *pSkipList, tSkipListKey *pKey) {
int32_t sLevel = pSkipList->nLevel - 1;
int32_t ret = -1;
tSkipListNode *x = &pSkipList->pHead;
pthread_rwlock_rdlock(&pSkipList->lock);
pSkipList->state.queryCount++;
__compar_fn_t filterComparator = getKeyFilterComparator(pSkipList, pKey->nType);
for (int32_t i = sLevel; i >= 0; --i) {
while (x->pForward[i] != NULL && (ret = filterComparator(&x->pForward[i]->key, pKey)) < 0) {
x = x->pForward[i];
}
if (ret == 0) {
pthread_rwlock_unlock(&pSkipList->lock);
return x->pForward[i];
}
}
pthread_rwlock_unlock(&pSkipList->lock);
return NULL;
}
static int32_t tSkipListEndParQuery(tSkipList *pSkipList, tSkipListNode *pStartNode, tSkipListKey *pEndKey,
int32_t cond, tSkipListNode ***pRes) {
pthread_rwlock_rdlock(&pSkipList->lock);
tSkipListNode *p = pStartNode;
int32_t numOfRes = 0;
__compar_fn_t filterComparator = getKeyFilterComparator(pSkipList, pEndKey->nType);
while (p != NULL) {
int32_t ret = filterComparator(&p->key, pEndKey);
if (ret > 0) {
break;
}
if (ret < 0) {
numOfRes++;
p = p->pForward[0];
} else if (ret == 0) {
if (cond == TSDB_RELATION_LESS_EQUAL) {
numOfRes++;
p = p->pForward[0];
} else {
break;
}
}
}
(*pRes) = (tSkipListNode **)malloc(POINTER_BYTES * numOfRes);
for (int32_t i = 0; i < numOfRes; ++i) {
(*pRes)[i] = pStartNode;
pStartNode = pStartNode->pForward[0];
}
pthread_rwlock_unlock(&pSkipList->lock);
return numOfRes;
}
/*
* maybe return the copy of tSkipListNode would be better
*/
int32_t tSkipListGets(tSkipList *pSkipList, tSkipListKey *pKey, tSkipListNode ***pRes) {
(*pRes) = NULL;
tSkipListNode *pNode = tSkipListGetOne(pSkipList, pKey);
if (pNode == NULL) {
return 0;
}
__compar_fn_t filterComparator = getKeyFilterComparator(pSkipList, pKey->nType);
// backward check if previous nodes are with the same value.
tSkipListNode *pPrev = pNode->pBackward[0];
while ((pPrev != &pSkipList->pHead) && filterComparator(&pPrev->key, pKey) == 0) {
pPrev = pPrev->pBackward[0];
}
return tSkipListEndParQuery(pSkipList, pPrev->pForward[0], &pNode->key, TSDB_RELATION_LESS_EQUAL, pRes);
}
static tSkipListNode *tSkipListParQuery(tSkipList *pSkipList, tSkipListKey *pKey, int32_t cond) {
int32_t sLevel = pSkipList->nLevel - 1;
int32_t ret = -1;
tSkipListNode *x = &pSkipList->pHead;
__compar_fn_t filterComparator = getKeyFilterComparator(pSkipList, pKey->nType);
pthread_rwlock_rdlock(&pSkipList->lock);
if (cond == TSDB_RELATION_LARGE_EQUAL || cond == TSDB_RELATION_LARGE) {
for (int32_t i = sLevel; i >= 0; --i) {
while (x->pForward[i] != NULL && (ret = filterComparator(&x->pForward[i]->key, pKey)) < 0) {
x = x->pForward[i];
}
}
// backward check if previous nodes are with the same value.
if (cond == TSDB_RELATION_LARGE_EQUAL && ret == 0) {
tSkipListNode *pNode = x->pForward[0];
while ((pNode->pBackward[0] != &pSkipList->pHead) && (filterComparator(&pNode->pBackward[0]->key, pKey) == 0)) {
pNode = pNode->pBackward[0];
}
pthread_rwlock_unlock(&pSkipList->lock);
return pNode;
}
if (ret > 0 || cond == TSDB_RELATION_LARGE_EQUAL) {
pthread_rwlock_unlock(&pSkipList->lock);
return x->pForward[0];
} else { // cond == TSDB_RELATION_LARGE && ret == 0
tSkipListNode *pn = x->pForward[0];
while (pn != NULL && filterComparator(&pn->key, pKey) == 0) {
pn = pn->pForward[0];
}
pthread_rwlock_unlock(&pSkipList->lock);
return pn;
}
}
pthread_rwlock_unlock(&pSkipList->lock);
return NULL;
}
int32_t tSkipListIterateList(tSkipList *pSkipList, tSkipListNode ***pRes, bool (*fp)(tSkipListNode *, void *),
void *param) {
(*pRes) = (tSkipListNode **)calloc(1, POINTER_BYTES * pSkipList->nSize);
if (NULL == *pRes) {
pError("error skiplist %p, malloc failed", pSkipList);
return -1;
}
pthread_rwlock_rdlock(&pSkipList->lock);
tSkipListNode *pStartNode = pSkipList->pHead.pForward[0];
int32_t num = 0;
for (int32_t i = 0; i < pSkipList->nSize; ++i) {
if (pStartNode == NULL) {
pError("error skiplist %p, required length:%d, actual length:%d", pSkipList, pSkipList->nSize, i - 1);
#ifdef _DEBUG_VIEW
SSkipListPrint(pSkipList, 1);
#endif
break;
}
if (fp == NULL || (fp != NULL && fp(pStartNode, param) == true)) {
(*pRes)[num++] = pStartNode;
}
pStartNode = pStartNode->pForward[0];
}
pthread_rwlock_unlock(&pSkipList->lock);
if (num == 0) {
free(*pRes);
*pRes = NULL;
} else if (num < pSkipList->nSize) { // free unused memory
char* tmp = realloc((*pRes), num * POINTER_BYTES);
assert(tmp != NULL);
*pRes = (tSkipListNode**)tmp;
}
return num;
}
int32_t tSkipListIteratorReset(tSkipList *pSkipList, SSkipListIterator* iter) {
if (pSkipList == NULL) {
return -1;
}
iter->pSkipList = pSkipList;
pthread_rwlock_rdlock(&pSkipList->lock);
iter->cur = NULL;//pSkipList->pHead.pForward[0];
iter->num = pSkipList->nSize;
pthread_rwlock_unlock(&pSkipList->lock);
return 0;
}
bool tSkipListIteratorNext(SSkipListIterator* iter) {
if (iter->num == 0 || iter->pSkipList == NULL) {
return false;
}
tSkipList* pSkipList = iter->pSkipList;
pthread_rwlock_rdlock(&pSkipList->lock);
if (iter->cur == NULL) {
iter->cur = pSkipList->pHead.pForward[0];
} else {
iter->cur = iter->cur->pForward[0];
}
pthread_rwlock_unlock(&pSkipList->lock);
return iter->cur != NULL;
}
tSkipListNode* tSkipListIteratorGet(SSkipListIterator* iter) {
return iter->cur;
}
int32_t tSkipListRangeQuery(tSkipList *pSkipList, tSKipListQueryCond *pCond, tSkipListNode ***pRes) {
pSkipList->state.queryCount++;
tSkipListNode *pStart = tSkipListParQuery(pSkipList, &pCond->lowerBnd, pCond->lowerBndRelOptr);
if (pStart == 0) {
*pRes = NULL;
return 0;
}
return tSkipListEndParQuery(pSkipList, pStart, &pCond->upperBnd, pCond->upperBndRelOptr, pRes);
}
static bool removeSupport(tSkipList *pSkipList, tSkipListNode **forward, tSkipListKey *pKey) {
__compar_fn_t filterComparator = getKeyFilterComparator(pSkipList, pKey->nType);
if (filterComparator(&forward[0]->pForward[0]->key, pKey) == 0) {
tSkipListNode *p = forward[0]->pForward[0];
doRemove(pSkipList, p, forward);
} else { // failed to find the node of specified value,abort
return false;
}
// compress the minimum level of skip list
while (pSkipList->nLevel > 0 && pSkipList->pHead.pForward[pSkipList->nLevel - 1] == NULL) {
pSkipList->nLevel -= 1;
}
return true;
}
void tSkipListRemoveNode(tSkipList *pSkipList, tSkipListNode *pNode) {
tSkipListNode *forward[MAX_SKIP_LIST_LEVEL] = {0};
pthread_rwlock_rdlock(&pSkipList->lock);
for (int32_t i = 0; i < pNode->nLevel; ++i) {
forward[i] = pNode->pBackward[i];
}
removeSupport(pSkipList, forward, &pNode->key);
pthread_rwlock_unlock(&pSkipList->lock);
}
bool tSkipListRemove(tSkipList *pSkipList, tSkipListKey *pKey) {
tSkipListNode *forward[MAX_SKIP_LIST_LEVEL] = {0};
__compar_fn_t filterComparator = getKeyFilterComparator(pSkipList, pKey->nType);
pthread_rwlock_rdlock(&pSkipList->lock);
tSkipListNode *x = &pSkipList->pHead;
for (int32_t i = pSkipList->nLevel - 1; i >= 0; --i) {
while (x->pForward[i] != NULL && (filterComparator(&x->pForward[i]->key, pKey) < 0)) {
x = x->pForward[i];
}
forward[i] = x;
}
bool ret = removeSupport(pSkipList, forward, pKey);
pthread_rwlock_unlock(&pSkipList->lock);
return ret;
}
void SSkipListPrint(tSkipList *pSkipList, int16_t nlevel) {
if (pSkipList == NULL || pSkipList->nLevel < nlevel || nlevel <= 0) {
return;
}
tSkipListNode *p = pSkipList->pHead.pForward[nlevel - 1];
int32_t id = 1;
while (p) {
switch (pSkipList->keyType) {
case TSDB_DATA_TYPE_INT:
case TSDB_DATA_TYPE_SMALLINT:
case TSDB_DATA_TYPE_TINYINT:
case TSDB_DATA_TYPE_BIGINT:
fprintf(stdout, "%d: %" PRId64 " \n", id++, p->key.i64Key);
break;
case TSDB_DATA_TYPE_BINARY:
fprintf(stdout, "%d: %s \n", id++, p->key.pz);
break;
case TSDB_DATA_TYPE_DOUBLE:
fprintf(stdout, "%d: %lf \n", id++, p->key.dKey);
break;
default:
fprintf(stdout, "\n");
}
p = p->pForward[nlevel - 1];
}
}
/*
* query processor based on query condition
*/
int32_t tSkipListQuery(tSkipList *pSkipList, tSKipListQueryCond *pQueryCond, tSkipListNode ***pResult) {
// query condition check
int32_t rel = 0;
__compar_fn_t comparator = getKeyComparator(pQueryCond->lowerBnd.nType);
if (pSkipList == NULL || pQueryCond == NULL || pSkipList->nSize == 0 ||
(((rel = comparator(&pQueryCond->lowerBnd, &pQueryCond->upperBnd)) > 0 &&
pQueryCond->lowerBnd.nType != TSDB_DATA_TYPE_NCHAR && pQueryCond->lowerBnd.nType != TSDB_DATA_TYPE_BINARY))) {
(*pResult) = NULL;
return 0;
}
if (rel == 0) {
/*
* 0 means: pQueryCond->lowerBnd == pQueryCond->upperBnd
* point query
*/
if (pQueryCond->lowerBndRelOptr == TSDB_RELATION_LARGE_EQUAL &&
pQueryCond->upperBndRelOptr == TSDB_RELATION_LESS_EQUAL) { // point query
return tSkipListGets(pSkipList, &pQueryCond->lowerBnd, pResult);
} else {
(*pResult) = NULL;
return 0;
}
} else {
/* range query, query operation code check */
return tSkipListRangeQuery(pSkipList, pQueryCond, pResult);
}
}
typedef struct MultipleQueryResult {
int32_t len;
tSkipListNode **pData;
} MultipleQueryResult;
static int32_t mergeQueryResult(MultipleQueryResult *pResults, int32_t numOfResSet, tSkipListNode ***pRes) {
int32_t total = 0;
for (int32_t i = 0; i < numOfResSet; ++i) {
total += pResults[i].len;
}
(*pRes) = malloc(POINTER_BYTES * total);
int32_t idx = 0;
for (int32_t i = 0; i < numOfResSet; ++i) {
MultipleQueryResult *pOneResult = &pResults[i];
for (int32_t j = 0; j < pOneResult->len; ++j) {
(*pRes)[idx++] = pOneResult->pData[j];
}
}
return total;
}
static void removeDuplicateKey(tSkipListKey *pKey, int32_t *numOfKey, __compar_fn_t comparator) {
if (*numOfKey == 1) {
return;
}
qsort(pKey, *numOfKey, sizeof(pKey[0]), comparator);
int32_t i = 0, j = 1;
while (i < (*numOfKey) && j < (*numOfKey)) {
int32_t ret = comparator(&pKey[i], &pKey[j]);
if (ret == 0) {
j++;
} else {
pKey[i + 1] = pKey[j];
i++;
j++;
}
}
(*numOfKey) = i + 1;
}
int32_t mergeResult(const tSkipListKey *pKey, int32_t numOfKey, tSkipListNode ***pRes, __compar_fn_t comparator,
tSkipListNode *pNode) {
int32_t i = 0, j = 0;
// merge two sorted arrays in O(n) time
while (i < numOfKey && pNode != NULL) {
int32_t ret = comparator(&pNode->key, &pKey[i]);
if (ret < 0) {
(*pRes)[j++] = pNode;
pNode = pNode->pForward[0];
} else if (ret == 0) {
pNode = pNode->pForward[0];
} else { // pNode->key > pkey[i]
i++;
}
}
while (pNode != NULL) {
(*pRes)[j++] = pNode;
pNode = pNode->pForward[0];
}
return j;
}
int32_t tSkipListPointQuery(tSkipList *pSkipList, tSkipListKey *pKey, int32_t numOfKey, tSkipListPointQueryType type,
tSkipListNode ***pRes) {
if (numOfKey == 0 || pKey == NULL || pSkipList == NULL || pSkipList->nSize == 0 ||
(type != INCLUDE_POINT_QUERY && type != EXCLUDE_POINT_QUERY)) {
(*pRes) = NULL;
return 0;
}
__compar_fn_t comparator = getKeyComparator(pKey->nType);
removeDuplicateKey(pKey, &numOfKey, comparator);
if (type == INCLUDE_POINT_QUERY) {
if (numOfKey == 1) {
return tSkipListGets(pSkipList, &pKey[0], pRes);
} else {
MultipleQueryResult *pTempResult = (MultipleQueryResult *)malloc(sizeof(MultipleQueryResult) * numOfKey);
for (int32_t i = 0; i < numOfKey; ++i) {
pTempResult[i].len = tSkipListGets(pSkipList, &pKey[i], &pTempResult[i].pData);
}
int32_t num = mergeQueryResult(pTempResult, numOfKey, pRes);
for (int32_t i = 0; i < numOfKey; ++i) {
free(pTempResult[i].pData);
}
free(pTempResult);
return num;
}
} else { // exclude query
*pRes = malloc(POINTER_BYTES * pSkipList->nSize);
__compar_fn_t filterComparator = getKeyFilterComparator(pSkipList, pKey->nType);
tSkipListNode *pNode = pSkipList->pHead.pForward[0];
int32_t retLen = mergeResult(pKey, numOfKey, pRes, filterComparator, pNode);
if (retLen < pSkipList->nSize) {
(*pRes) = realloc(*pRes, POINTER_BYTES * retLen);
}
return retLen;
}
}
#endif
\ No newline at end of file
src/util/src/tskiplist.c
浏览文件 @ 81bd97ca
......@@ -524,6 +524,71 @@ SArray* tSkipListGet(SSkipList *pSkipList, SSkipListKey pKey, int16_t keyType) {
return sa;
}
size_t tSkipListGetSize(const SSkipList* pSkipList) {
if (pSkipList == NULL) {
return 0;
}
return pSkipList->size;
}
SSkipListIterator* tSkipListCreateIter(SSkipList *pSkipList) {
if (pSkipList == NULL) {
return NULL;
}
SSkipListIterator* iter = calloc(1, sizeof(SSkipListIterator));
iter->pSkipList = pSkipList;
if (pSkipList->lock) {
pthread_rwlock_rdlock(pSkipList->lock);
}
iter->cur = NULL;
iter->num = pSkipList->size;
if (pSkipList->lock) {
pthread_rwlock_unlock(pSkipList->lock);
}
return iter;
}
bool tSkipListIterNext(SSkipListIterator *iter) {
if (iter->num == 0 || iter->pSkipList == NULL) {
return false;
}
SSkipList *pSkipList = iter->pSkipList;
if (pSkipList->lock) {
pthread_rwlock_rdlock(pSkipList->lock);
}
if (iter->cur == NULL) {
iter->cur = SL_GET_FORWARD_POINTER(pSkipList->pHead, 0);
} else {
iter->cur = SL_GET_FORWARD_POINTER(iter->cur, 0);
}
if (pSkipList->lock) {
pthread_rwlock_unlock(pSkipList->lock);
}
return iter->cur != NULL;
}
SSkipListNode *tSkipListIterGet(SSkipListIterator *iter) { return (iter == NULL)? NULL:iter->cur; }
void* tSkipListDestroyIter(SSkipListIterator* iter) {
if (iter == NULL) {
return NULL;
}
tfree(iter);
return NULL;
}
// static int32_t tSkipListEndParQuery(SSkipList *pSkipList, SSkipListNode *pStartNode, SSkipListKey *pEndKey,
// int32_t cond, SSkipListNode ***pRes) {
// pthread_rwlock_rdlock(&pSkipList->lock);
......
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