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IX_Manager.cpp
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//
// Created by 唐艺峰 on 2018/12/13.
//
#include "IX_Manager.h"
RC CreateIndex(const char *fileName, AttrType attrType, int attrLength) {
auto pf_fileHandle = new PF_FileHandle();
RC fileCreateCode = CreateFile(fileName);
if (fileCreateCode != SUCCESS) {
delete pf_fileHandle;
return fileCreateCode;
}
OpenFile((char *) fileName, pf_fileHandle);
int keys_size = (PF_PAGE_SIZE - sizeof(IX_FileHeader) - sizeof(IX_Node)) / (2 * sizeof(RID) + attrLength);
auto ix_fileHeader = new IX_FileHeader;
ix_fileHeader->attrLength = attrLength;
ix_fileHeader->keyLength = attrLength + sizeof(RID);
ix_fileHeader->attrType = attrType;
ix_fileHeader->rootPage = 2;
ix_fileHeader->first_leaf = 2;
// ix_fileHeader->order = keys_size - 2; // debug here!
ix_fileHeader->order = 4;
// -1 -> for extra child in children list; -1 -> for possible insert place
auto ix_node = new IX_Node;
ix_node->is_leaf = true;
ix_node->keynum = 0;
ix_node->parent = 0;
ix_node->brother = 0;
ix_node->keys_offset = sizeof(IX_FileHeader) + sizeof(IX_Node);
ix_node->rids_offset = ix_node->keys_offset + keys_size * (sizeof(RID) + attrLength);
auto pf_pageHandle = new PF_PageHandle();
pf_pageHandle->bOpen = true;
AllocatePage(pf_fileHandle, pf_pageHandle);
char *dst_data;
GetData(pf_pageHandle, &dst_data);
memcpy(dst_data, ix_fileHeader, sizeof(IX_FileHeader));
MarkDirty(pf_fileHandle, pf_pageHandle);
UnpinPage(pf_pageHandle);
delete pf_pageHandle;
// create header page
pf_pageHandle = new PF_PageHandle();
pf_pageHandle->bOpen = true;
AllocatePage(pf_fileHandle, pf_pageHandle);
GetData(pf_pageHandle, &dst_data);
memcpy(dst_data + sizeof(IX_FileHeader), ix_node, sizeof(IX_Node));
MarkDirty(pf_fileHandle, pf_pageHandle);
UnpinPage(pf_pageHandle);
// create first page
CloseFile(pf_fileHandle);
delete pf_fileHandle;
delete pf_pageHandle;
delete ix_fileHeader;
delete ix_node;
return SUCCESS;
}
RC OpenIndex(const char *fileName, IX_IndexHandle *indexHandle) {
auto pf_fileHandle = new PF_FileHandle();
if (OpenFile((char *) fileName, pf_fileHandle) != SUCCESS) {
delete pf_fileHandle;
return PF_FILEERR;
}
indexHandle->headerPage = new PF_PageHandle;
GetThisPage(pf_fileHandle, 1, indexHandle->headerPage);
char *src_data;
GetData(indexHandle->headerPage, &src_data);
indexHandle->bOpen = true;
indexHandle->fileHandle = pf_fileHandle;
indexHandle->fileHeader = (IX_FileHeader *) src_data;
return SUCCESS;
}
RC CloseIndex(IX_IndexHandle *indexHandle) {
CloseFile(indexHandle->fileHandle);
indexHandle->bOpen = false;
delete indexHandle->fileHandle;
delete indexHandle->headerPage;
return SUCCESS;
}
PageNum createNewNode(IX_IndexHandle *indexHandle) {
auto pf_fileHandle = indexHandle->fileHandle;
auto pf_pageHandle = new PF_PageHandle();
pf_pageHandle->bOpen = true;
RC result = AllocatePage(pf_fileHandle, pf_pageHandle);
if (result != SUCCESS) {
printf("Error code: %d when creating new node\n", result);
exit(1);
}
int keys_size = (PF_PAGE_SIZE - sizeof(IX_FileHeader) - sizeof(IX_Node)) / (2 * sizeof(RID) + indexHandle->fileHeader->attrLength);
auto ix_node = new IX_Node;
ix_node->is_leaf = false;
ix_node->keynum = 0;
ix_node->parent = 0;
ix_node->brother = 0;
ix_node->keys_offset = sizeof(IX_FileHeader) + sizeof(IX_Node);
ix_node->rids_offset = ix_node->keys_offset + indexHandle->fileHeader->keyLength * keys_size;
char *dst_data;
GetData(pf_pageHandle, &dst_data);
memcpy(dst_data + sizeof(IX_FileHeader), ix_node, sizeof(IX_Node));
PageNum newPageNum = 0;
GetPageNum(pf_pageHandle, &newPageNum);
MarkDirty(pf_fileHandle, pf_pageHandle);
delete pf_pageHandle;
delete ix_node;
return newPageNum;
}
IX_Node * getIxNode(IX_IndexHandle *indexHandle, PageNum pageNum, PF_PageHandle * pf_pageHandle) {
RC result = GetThisPage(indexHandle->fileHandle, pageNum, pf_pageHandle);
char *src_data;
GetData(pf_pageHandle, &src_data);
return (IX_Node *) (src_data + sizeof(IX_FileHeader));
}
int compareKey(char *key1, char *key2, AttrType attrType, int attrLength) {
switch (attrType) {
case ints: {
int k1 = * (int *) key1;
int k2 = * (int *) key2;
if (k1 != k2) {
return k1 > k2 ? 1 : -1;
}
break;
}
case floats: {
float k1 = * (float *) key1;
float k2 = * (float *) key2;
if (!floatEqual(k1, k2)) {
return floatLess(k2, k1) ? 1 : -1;
}
break;
}
case chars: {
int strcmpResult = strcmp(key1, key2);
if (strcmpResult != 0) {
return strcmpResult;
}
break;
}
}
RID *rid1 = (RID *) (key1 + (sizeof(char) * attrLength));
RID *rid2 = (RID *) (key2 + (sizeof(char) * attrLength));
if (rid1->pageNum != rid2->pageNum) {
return rid1->pageNum > rid2->pageNum ? 2 : -2;
} else if (rid1->slotNum != rid2->slotNum) {
return rid1->slotNum > rid2->slotNum ? 2 : -2;
} else {
return 0;
}
}
PageNum findKey(IX_IndexHandle *indexHandle, AttrType attrType, int attrLength, int keyLength, char *key) {
PageNum currentPage = indexHandle->fileHeader->rootPage;
auto currentNodePage = new PF_PageHandle;
auto currentNode = getIxNode(indexHandle, currentPage, currentNodePage);
char *src_data;
while (!currentNode->is_leaf) {
bool isFound = false;
GetData(currentNodePage, &src_data);
// Get that data
char *keys = src_data + currentNode->keys_offset;
char *rids = src_data + currentNode->rids_offset;
for (int i = 0; i < currentNode->keynum; i++) {
char *curKey = keys + sizeof(char) * i * keyLength;
if (compareKey(curKey, key, attrType, attrLength) > 0) {
PageNum curChild = * (PageNum *) (rids + sizeof(PageNum) * i);
UnpinPage(currentNodePage);
currentNode = getIxNode(indexHandle, curChild, currentNodePage);
currentPage = curChild;
isFound = true;
break;
}
}
if (!isFound) {
PageNum curChild = * (PageNum *) (rids + sizeof(PageNum) * currentNode->keynum);
UnpinPage(currentNodePage);
currentNode = getIxNode(indexHandle, curChild, currentNodePage);
currentPage = curChild;
}
}
UnpinPage(currentNodePage);
delete currentNodePage;
return currentPage;
}
bool checkConditions(IX_IndexScan *indexScan, char * check_value) {
auto keyLength = indexScan->pIXIndexHandle->fileHeader->keyLength;
auto attrLength = indexScan->pIXIndexHandle->fileHeader->attrLength;
auto attrType = indexScan->pIXIndexHandle->fileHeader->attrType;
char comparedKey[keyLength];
memcpy(comparedKey, indexScan->value, attrLength);
memset(comparedKey + attrLength, 0, sizeof(RID));
int compare_result = compareKey(check_value, comparedKey, attrType, attrLength);
compare_result = (compare_result == -2 || compare_result == 2) ? 0 : compare_result;
switch (indexScan->compOp) {
case EQual: {
return compare_result == 0;
}
case LEqual: {
return compare_result <= 0;
}
case NEqual: {
return compare_result != 0;
}
case LessT: {
return compare_result < 0;
}
case GEqual: {
return compare_result >= 0;
}
case GreatT: {
return compare_result > 0;
}
case NO_OP: {
return true;
}
}
}
RC findStartKey(IX_IndexScan *indexScan, char *key) {
auto indexHandle = indexScan->pIXIndexHandle;
auto keyLength = indexHandle->fileHeader->keyLength;
auto attrType = indexHandle->fileHeader->attrType;
auto attrLength = indexHandle->fileHeader->attrLength;
PageNum currentPage = indexHandle->fileHeader->rootPage;
auto currentNodePage = new PF_PageHandle;
auto currentNode = getIxNode(indexHandle, currentPage, currentNodePage);
char *src_data;
UnpinPage(currentNodePage);
delete currentNodePage;
if (indexScan->compOp == LessT || indexScan->compOp == LEqual || indexScan->compOp == NO_OP) {
while (!currentNode->is_leaf) {
GetThisPage(indexHandle->fileHandle, currentPage, currentNodePage);
GetData(currentNodePage, &src_data);
char *rids = src_data + currentNode->rids_offset;
memcpy(¤tPage, rids, sizeof(PageNum));
currentNode = getIxNode(indexHandle, currentPage, currentNodePage);
}
indexScan->pnNext = currentPage;
indexScan->ridIx = 0;
return INDEX_EXIST;
}
currentPage = findKey(indexScan->pIXIndexHandle, attrType, attrLength, keyLength, key);
currentNode = getIxNode(indexHandle, currentPage, currentNodePage);
GetThisPage(indexHandle->fileHandle, currentPage, currentNodePage);
GetData(currentNodePage, &src_data);
char *keys = src_data + currentNode->keys_offset;
for (int i = 0; i < currentNode->keynum; i++) {
char *cur_key = keys + keyLength * i;
if (compareKey(cur_key, key, attrType, attrLength) >= 0) {
indexScan->pnNext = currentPage;
indexScan->ridIx = i;
return INDEX_EXIST;
}
}
indexScan->pnNext = currentNode->brother;
indexScan->ridIx = 0;
return INDEX_NOT_EXIST;
}
void addToList(int keyLength, char *keyList, int list_size, char *key, int pos) {
if (keyLength == sizeof(PageNum)) {
PageNum tmp = 0;
memcpy(&tmp, key, sizeof(PageNum));
// if (tmp == 0) {
// printf("??");
// }
}
for (int i = list_size - 1; i >= pos; i--) {
char *curKey = keyList + keyLength * i;
memcpy(curKey + keyLength, curKey, sizeof(char) * keyLength);
}
memcpy(keyList + keyLength * pos, key, sizeof(char) * keyLength);
}
void removeFromList(int keyLength, char *keyList, int list_size, char *key, int pos) { // fixme: key's memory must be allocated
memcpy(key, keyList + keyLength * pos, sizeof(char) * keyLength);
for (int i = pos + 1; i < list_size; i++) {
char *curKey = keyList + keyLength * i;
memcpy(curKey - keyLength, curKey, sizeof(char) * keyLength);
}
}
void getFromList(int keyLength, char *keyList, char *key, int pos) { // fixme: key's memory must be allocated
memcpy(key, keyList + keyLength * pos, sizeof(char) * keyLength);
}
void setToList(int keyLength, char *keyList, char *key, int pos) {
if (keyLength == sizeof(PageNum)) {
PageNum tmp = 0;
memcpy(&tmp, key, sizeof(PageNum));
// if (tmp == 0) {
// printf("??");
// }
}
memcpy(keyList + keyLength * pos, key, sizeof(char) * keyLength);
}
bool checkValid(IX_Node * node, int order) {
if (node->parent == 0) {
return node->keynum <= order;
}
return node->keynum >= (ceil((double) order / 2.0)) && node->keynum <= order;
}
PageNum findOnesLeftSibling(IX_IndexHandle *indexHandle, PageNum aimPageNode, IX_Node * aimNode) {
PageNum parentPageNum = aimNode->parent;
IX_Node * parentNode;
auto parentPage = new PF_PageHandle;
char * parentChildren;
char * parent_src_data;
int up_step = 0;
while (parentPageNum != 0) {
int numAsChild = -1;
parentNode = getIxNode(indexHandle, parentPageNum, parentPage);
GetData(parentPage, &parent_src_data);
parentChildren = parent_src_data + parentNode->rids_offset;
// initialize parent's info
for (int i = 0; i < parentNode->keynum + 1; i++) {
PageNum curChild;
memcpy(&curChild, parentChildren + i * sizeof(PageNum), sizeof(PageNum));
if (curChild == aimPageNode) {
numAsChild = i;
break;
}
}
UnpinPage(parentPage);
if (numAsChild == 0) {
aimPageNode = parentPageNum;
parentPageNum = parentNode->parent;
up_step++;
continue;
}
PageNum leftSiblingPageNum;
memcpy(&leftSiblingPageNum, parentChildren + (numAsChild - 1) * sizeof(PageNum), sizeof(PageNum));
// find the ancestor
IX_Node * leftSiblingNode;
char * leftSiblingChildren;
char * leftSibling_src_data;
for (int i = 0; i < up_step; i++) {
leftSiblingNode = getIxNode(indexHandle, leftSiblingPageNum, parentPage);
GetData(parentPage, &leftSibling_src_data);
leftSiblingChildren = leftSibling_src_data + leftSiblingNode->rids_offset;
memcpy(&leftSiblingPageNum, leftSiblingChildren + leftSiblingNode->keynum * sizeof(PageNum), sizeof(PageNum));
UnpinPage(parentPage);
}
delete parentPage;
return leftSiblingPageNum;
}
delete parentPage;
return 0;
}
RC InsertEntry(IX_IndexHandle *indexHandle, char *pData, const RID *rid) {
AttrType attrType = indexHandle->fileHeader->attrType;
int attrLength = indexHandle->fileHeader->attrLength;
int keyLength = indexHandle->fileHeader->keyLength;
char realKey[keyLength];
memcpy(realKey, pData, sizeof(char) * attrLength);
memcpy(realKey + attrLength, rid, sizeof(RID));
// basic info
auto aimNodePageNum = findKey(indexHandle, attrType, attrLength, keyLength, realKey);
auto aimNodePage = new PF_PageHandle;
auto aimNode = getIxNode(indexHandle, aimNodePageNum, aimNodePage);
char *src_data;
GetData(aimNodePage, &src_data);
// initialize start info
char *aimNodeKeyList = src_data + aimNode->keys_offset;
char *aimNodeRidList = src_data + aimNode->rids_offset;
int addPos = -1;
for (int i = 0; i < aimNode->keynum; i++) {
char *curKey = aimNodeKeyList + sizeof(char) * i * keyLength;
if (compareKey(curKey, realKey, attrType, attrLength) > 0) {
addPos = i;
break;
}
}
if (addPos == -1) {
addPos = aimNode->keynum;
} // confirm insert pos
addToList(keyLength, aimNodeKeyList, aimNode->keynum, realKey, addPos);
addToList(sizeof(RID), aimNodeRidList, aimNode->keynum, (char *) rid, addPos);
aimNode->keynum++;
// for leaf, key.size = children.size
bool isValid = checkValid(aimNode, indexHandle->fileHeader->order);
if (isValid) {
MarkDirty(indexHandle->fileHandle, aimNodePage);
UnpinPage(aimNodePage);
delete aimNodePage;
return SUCCESS;
}
PageNum parentPageNum;
auto parentPage = new PF_PageHandle;
IX_Node * parentNode;
char * parentKeyList, * parentChildren;
char * parent_src_data;
while (!isValid) {
int newIdxPos = aimNode->keynum / 2;
auto newIdx = new char[keyLength];
getFromList(keyLength, aimNodeKeyList, newIdx, newIdxPos);
int numAsChild = -1;
parentPageNum = aimNode->parent;
bool shouldCreateNew = parentPageNum == 0;
if (shouldCreateNew) {
parentPageNum = createNewNode(indexHandle);
}
parentNode = getIxNode(indexHandle, parentPageNum, parentPage);
GetData(parentPage, &parent_src_data);
parentKeyList = parent_src_data + parentNode->keys_offset;
parentChildren = parent_src_data + parentNode->rids_offset;
if (shouldCreateNew) {
addToList(sizeof(PageNum), parentChildren, 0, (char *) &aimNodePageNum, 0);
// do not need to add up on key num
aimNode->parent = parentPageNum;
indexHandle->fileHeader->rootPage = parentPageNum;
MarkDirty(indexHandle->fileHandle, indexHandle->headerPage);
} // change the root
// prepare those data pointer
for (int i = 0; i < parentNode->keynum; i++) {
char *curKey = parentKeyList + sizeof(char) * i * keyLength;
if (compareKey(curKey, realKey, attrType, attrLength) > 0) {
numAsChild = i;
break;
}
}
if (numAsChild == -1) {
numAsChild = parentNode->keynum;
} // find pos as a child
//
PageNum leftSiblingPageNum = 0;
PageNum rightSiblingPageNum = 0;
if (numAsChild != 0) {
getFromList(sizeof(PageNum), parentChildren, (char *) &leftSiblingPageNum, numAsChild - 1);
}
if (numAsChild != parentNode->keynum) {
getFromList(sizeof(PageNum), parentChildren, (char *) &rightSiblingPageNum, numAsChild + 1);
} // find its left and right sibling
PageNum newLeftChildPageNum = createNewNode(indexHandle);
auto newLeftChildPage = new PF_PageHandle;
IX_Node * newLeftChildNode;
char * newLeftChildKeyList, * newLeftChildChildren;
char * newLeftChild_src_data;
newLeftChildNode = getIxNode(indexHandle, newLeftChildPageNum, newLeftChildPage);
GetData(newLeftChildPage, &newLeftChild_src_data);
newLeftChildKeyList = newLeftChild_src_data + newLeftChildNode->keys_offset;
newLeftChildChildren = newLeftChild_src_data + newLeftChildNode->rids_offset;
newLeftChildNode->is_leaf = aimNode->is_leaf;
newLeftChildNode->parent = parentPageNum;
for (int i = 0; i < newIdxPos; i++) {
char addedKey[keyLength];
getFromList(keyLength, aimNodeKeyList, addedKey, i);
addToList(keyLength, newLeftChildKeyList, newLeftChildNode->keynum, addedKey, newLeftChildNode->keynum);
newLeftChildNode->keynum++;
}
if (!aimNode->is_leaf) {
for (int i = 0; i <= newIdxPos; i++) {
PageNum addedChildPageNum = 0;
auto aimChildNodePage = new PF_PageHandle;
getFromList(sizeof(PageNum), aimNodeRidList, (char *) &addedChildPageNum, i);
auto addChildNode = getIxNode(indexHandle, addedChildPageNum, aimChildNodePage);
addChildNode->parent = newLeftChildPageNum;
addToList(sizeof(PageNum), newLeftChildChildren, i, (char *) &addedChildPageNum, i);
MarkDirty(indexHandle->fileHandle, aimChildNodePage);
UnpinPage(aimChildNodePage);
delete aimChildNodePage;
// it will stop at the correct num
}
} else {
for (int i = 0; i < newIdxPos; i++) {
auto addedRid = new RID;
getFromList(sizeof(RID), aimNodeRidList, (char *) addedRid, i);
addToList(sizeof(RID), newLeftChildChildren, i, (char *) addedRid, i);
delete addedRid;
}
} // add children
PageNum newRightChildPageNum = createNewNode(indexHandle);
auto newRightChildPage = new PF_PageHandle;
IX_Node * newRightChildNode;
char * newRightChildKeyList, * newRightChildChildren;
char * newRightChild_src_data;
newRightChildNode = getIxNode(indexHandle, newRightChildPageNum, newRightChildPage);
GetData(newRightChildPage, &newRightChild_src_data);
newRightChildKeyList = newRightChild_src_data + newRightChildNode->keys_offset;
newRightChildChildren = newRightChild_src_data + newRightChildNode->rids_offset;
newRightChildNode->is_leaf = aimNode->is_leaf;
newRightChildNode->parent = parentPageNum;
for (int i = newIdxPos + (aimNode->is_leaf ? 0 : 1); i < aimNode->keynum; i++) {
char addedKey[keyLength];
getFromList(keyLength, aimNodeKeyList, addedKey, i);
addToList(keyLength, newRightChildKeyList, newRightChildNode->keynum, addedKey, newRightChildNode->keynum);
newRightChildNode->keynum++;
}
if (!aimNode->is_leaf) {
for (int i = newIdxPos + 1; i <= aimNode->keynum; i++) {
PageNum addedChildPageNum = 0;
auto aimChildNodePage = new PF_PageHandle;
getFromList(sizeof(PageNum), aimNodeRidList, (char *) &addedChildPageNum, i);
auto addChildNode = getIxNode(indexHandle, addedChildPageNum, aimChildNodePage);
addChildNode->parent = newRightChildPageNum;
addToList(sizeof(PageNum), newRightChildChildren, i - (newIdxPos + 1), (char *) &addedChildPageNum, i - (newIdxPos + 1));
MarkDirty(indexHandle->fileHandle, aimChildNodePage);
UnpinPage(aimChildNodePage);
delete aimChildNodePage;
// it will stop at the correct num
}
} else {
for (int i = newIdxPos; i < aimNode->keynum; i++) {
auto addedRid = new RID;
getFromList(sizeof(RID), aimNodeRidList, (char *) addedRid, i);
addToList(sizeof(RID), newRightChildChildren, i - (newIdxPos), (char *) addedRid, i - (newIdxPos));
delete addedRid;
}
} // add children
if (shouldCreateNew) {
leftSiblingPageNum = 0;
} else {
leftSiblingPageNum = findOnesLeftSibling(indexHandle, aimNodePageNum, aimNode);
}
rightSiblingPageNum = aimNode->brother;
if (leftSiblingPageNum != 0) {
auto leftSiblingPage = new PF_PageHandle;
auto leftSiblingNode = getIxNode(indexHandle, leftSiblingPageNum, leftSiblingPage);
leftSiblingNode->brother = newLeftChildPageNum;
MarkDirty(indexHandle->fileHandle, leftSiblingPage);
UnpinPage(leftSiblingPage);
delete leftSiblingPage;
}
newLeftChildNode->brother = newRightChildPageNum;
if (rightSiblingPageNum != 0) {
auto rightSiblingPage = new PF_PageHandle;
auto rightSiblingNode = getIxNode(indexHandle, rightSiblingPageNum, rightSiblingPage);
newRightChildNode->brother = rightSiblingPageNum;
MarkDirty(indexHandle->fileHandle, rightSiblingPage);
UnpinPage(rightSiblingPage);
delete rightSiblingPage;
}
// set all siblings
addToList(keyLength, parentKeyList, parentNode->keynum, newIdx, numAsChild);
parentNode->keynum++;
setToList(sizeof(PageNum), parentChildren, (char *) &newLeftChildPageNum, numAsChild);
addToList(sizeof(PageNum), parentChildren, parentNode->keynum, (char *) &newRightChildPageNum, numAsChild + 1);
// set children
DisposePage(indexHandle->fileHandle, aimNodePageNum);
delete aimNodePage;
// Destroy formal page
aimNode = parentNode;
aimNodeKeyList = parentKeyList;
aimNodeRidList = parentChildren;
aimNodePageNum = parentPageNum;
aimNodePage = parentPage;
parentPage = new PF_PageHandle;
// aimNode = parentNode
MarkDirty(indexHandle->fileHandle, newLeftChildPage);
MarkDirty(indexHandle->fileHandle, newRightChildPage);
UnpinPage(newLeftChildPage);
UnpinPage(newRightChildPage);
delete newLeftChildPage;
delete newRightChildPage;
delete[] newIdx;
isValid = checkValid(aimNode, indexHandle->fileHeader->order);
}
MarkDirty(indexHandle->fileHandle, aimNodePage);
UnpinPage(aimNodePage);
// UnpinPage(headerPage);
delete aimNodePage;
// delete headerPage;
delete parentPage;
return SUCCESS;
}
RC DeleteEntry(IX_IndexHandle *indexHandle, char *pData, const RID *rid, int flag) {
AttrType attrType = indexHandle->fileHeader->attrType;
int attrLength = indexHandle->fileHeader->attrLength;
int keyLength = indexHandle->fileHeader->keyLength;
int order = indexHandle->fileHeader->order;
// auto headerPage = new PF_PageHandle;
// GetThisPage(indexHandle->fileHandle, 1, headerPage);
// if (flag == 13) {
// PageNum parentPageNum;
// auto parentPage = new PF_PageHandle;
// IX_Node * parentNode;
// char * parentKeyList, * parentChildren;
// char * parent_src_data;
//
// parentPageNum = 37;
// parentNode = getIxNode(indexHandle, parentPageNum, parentPage);
// GetData(parentPage, &parent_src_data);
// parentKeyList = parent_src_data + parentNode->keys_offset;
// parentChildren = parent_src_data + parentNode->rids_offset;
// printf("??");
// }
char realKey[keyLength];
memset(realKey, 0, (size_t) keyLength);
memcpy(realKey, pData, sizeof(char) * attrLength);
memcpy(realKey + attrLength, rid, sizeof(RID));
// basic info
int deletePos = -1;
auto aimNodePageNum = findKey(indexHandle, attrType, attrLength, keyLength, realKey);
auto aimNodePage = new PF_PageHandle;
auto aimNode = getIxNode(indexHandle, aimNodePageNum, aimNodePage);
char *src_data;
GetData(aimNodePage, &src_data);
char *aimNodeKeyList = src_data + aimNode->keys_offset;
char *aimNodeRidList = src_data + aimNode->rids_offset;
for (int i = 0; i < aimNode->keynum; i++) {
char *curKey = aimNodeKeyList + sizeof(char) * i * keyLength;
if (compareKey(curKey, realKey, attrType, attrLength) == 0) {
deletePos = i;
break;
}
}
if (deletePos == -1) {
return IX_INVALIDKEY;
} // check whether the key exists
char dumpKey[keyLength], dumpRid[sizeof(RID)], dumpPageNum[sizeof(PageNum)];
removeFromList(keyLength, aimNodeKeyList, aimNode->keynum, dumpKey, deletePos);
removeFromList(sizeof(RID), aimNodeRidList, aimNode->keynum, dumpRid, deletePos);
aimNode->keynum--;
bool isValid = checkValid(aimNode, order);
// delete the value
if (isValid) {
MarkDirty(indexHandle->fileHandle, aimNodePage);
UnpinPage(aimNodePage);
// UnpinPage(headerPage);
// delete headerPage;
delete aimNodePage;
return SUCCESS;
}
PageNum parentPageNum;
auto parentPage = new PF_PageHandle;
IX_Node * parentNode;
char * parentKeyList, * parentChildren;
char * parent_src_data;
while (!isValid) {
int numAsChild = -1;
parentPageNum = aimNode->parent;
parentNode = getIxNode(indexHandle, parentPageNum, parentPage);
GetData(parentPage, &parent_src_data);
parentKeyList = parent_src_data + parentNode->keys_offset;
parentChildren = parent_src_data + parentNode->rids_offset;
// initialize parent's info
for (int i = 0; i < parentNode->keynum; i++) {
char *curKey = parentKeyList + sizeof(char) * i * keyLength;
if (compareKey(curKey, realKey, attrType, attrLength) > 0) {
numAsChild = i;
break;
}
}
if (numAsChild == -1) {
numAsChild = parentNode->keynum;
} // find pos as a child
PageNum leftSiblingPageNum = 0;
PageNum rightSiblingPageNum = 0;
IX_Node * leftSiblingNode = nullptr, * rightSiblingNode = nullptr;
char * leftSiblingKeyList, * leftSiblingChildList;
char * rightSiblingKeyList, * rightSiblingChildList;
char * leftSiblingSrcData, * rightSiblingSrcData;
bool isLeftEnough = false, isRightEnough = false;
PF_PageHandle * leftSiblingPage = nullptr;
PF_PageHandle * rightSiblingPage = nullptr;
bool hasLeftSibling = false, hasRightSibling = false;
if (numAsChild != 0) {
hasLeftSibling = true;
leftSiblingPage = new PF_PageHandle;
getFromList(sizeof(PageNum), parentChildren, (char *) &leftSiblingPageNum, numAsChild - 1);
leftSiblingNode = getIxNode(indexHandle, leftSiblingPageNum, leftSiblingPage);
isLeftEnough = (leftSiblingNode->keynum > (ceil((double) order / 2.0)));
GetData(leftSiblingPage, &leftSiblingSrcData);
leftSiblingKeyList = leftSiblingSrcData + leftSiblingNode->keys_offset;
leftSiblingChildList = leftSiblingSrcData + leftSiblingNode->rids_offset;
}
if (numAsChild != parentNode->keynum) {
hasRightSibling = true;
rightSiblingPage = new PF_PageHandle;
getFromList(sizeof(PageNum), parentChildren, (char *) &rightSiblingPageNum, numAsChild + 1);
rightSiblingNode = getIxNode(indexHandle, rightSiblingPageNum, rightSiblingPage);
isRightEnough = (rightSiblingNode->keynum > (ceil((double) order / 2.0)));
GetData(rightSiblingPage, &rightSiblingSrcData);
rightSiblingKeyList = rightSiblingSrcData + rightSiblingNode->keys_offset;
rightSiblingChildList = rightSiblingSrcData + rightSiblingNode->rids_offset;
} // find its left and right sibling and check whether it's enough
if (isLeftEnough) {
if (aimNode->is_leaf) {
char borrowedKey[keyLength], borrowedRid[sizeof(RID)];
removeFromList(keyLength, leftSiblingKeyList, leftSiblingNode->keynum, borrowedKey, leftSiblingNode->keynum - 1);
removeFromList(sizeof(RID), leftSiblingChildList, leftSiblingNode->keynum, borrowedRid, leftSiblingNode->keynum - 1);
leftSiblingNode->keynum--;
// remove key
addToList(keyLength, aimNodeKeyList, aimNode->keynum, borrowedKey, 0);
addToList(sizeof(RID), aimNodeRidList, aimNode->keynum, borrowedRid, 0);
aimNode->keynum++;
// add key
setToList(keyLength, parentKeyList, borrowedKey, numAsChild - 1);
// set parent's key
} else {
char borrowedKey[keyLength], newParentKey[keyLength];
char borrowedChildPageNum[sizeof(PageNum)];
getFromList(keyLength, parentKeyList, borrowedKey, numAsChild - 1);
removeFromList(keyLength, leftSiblingKeyList, leftSiblingNode->keynum, newParentKey, leftSiblingNode->keynum - 1);
removeFromList(sizeof(PageNum), leftSiblingChildList, leftSiblingNode->keynum + 1, borrowedChildPageNum, leftSiblingNode->keynum);
leftSiblingNode->keynum--;
addToList(keyLength, aimNodeKeyList, aimNode->keynum, borrowedKey, 0);
addToList(sizeof(PageNum), aimNodeRidList, aimNode->keynum + 1, borrowedChildPageNum, 0);
aimNode->keynum++;
setToList(keyLength, parentKeyList, newParentKey, numAsChild - 1);
PageNum borrowedChildPageNumInt;
memcpy(&borrowedChildPageNumInt, borrowedChildPageNum, sizeof(PageNum));
auto borrowedChildPage = new PF_PageHandle;
auto borrowedChildNode = getIxNode(indexHandle, borrowedChildPageNumInt, borrowedChildPage);
borrowedChildNode->parent = aimNodePageNum;
MarkDirty(indexHandle->fileHandle, borrowedChildPage);
UnpinPage(borrowedChildPage);
delete borrowedChildPage; // set borrowed child's parent
}
} else if (isRightEnough) {
if (aimNode->is_leaf) {
char borrowedKey[keyLength], borrowedRid[sizeof(RID)];
removeFromList(keyLength, rightSiblingKeyList, rightSiblingNode->keynum, borrowedKey, 0);
removeFromList(sizeof(RID), rightSiblingChildList, rightSiblingNode->keynum, borrowedRid, 0);
rightSiblingNode->keynum--;
// remove key
addToList(keyLength, aimNodeKeyList, aimNode->keynum, borrowedKey, aimNode->keynum);
addToList(sizeof(RID), aimNodeRidList, aimNode->keynum, borrowedRid, aimNode->keynum);
aimNode->keynum++;
// add key
char newKey[keyLength];
getFromList(keyLength, rightSiblingKeyList, newKey, 0);
setToList(keyLength, parentKeyList, newKey, numAsChild);
// set parent's key
} else {
char borrowedKey[keyLength], newParentKey[keyLength];
char borrowedChildPageNum[sizeof(PageNum)];
getFromList(keyLength, parentKeyList, borrowedKey, numAsChild);
removeFromList(keyLength, rightSiblingKeyList, rightSiblingNode->keynum, newParentKey, 0);
removeFromList(sizeof(PageNum), rightSiblingChildList, rightSiblingNode->keynum + 1, borrowedChildPageNum, 0);
rightSiblingNode->keynum--;
addToList(keyLength, aimNodeKeyList, aimNode->keynum, borrowedKey, aimNode->keynum);
addToList(sizeof(PageNum), aimNodeRidList, aimNode->keynum + 1, borrowedChildPageNum, aimNode->keynum + 1);
aimNode->keynum++;
setToList(keyLength, parentKeyList, newParentKey, numAsChild);
PageNum borrowedChildPageNumInt;
memcpy(&borrowedChildPageNumInt, borrowedChildPageNum, sizeof(PageNum));
auto borrowedChildPage = new PF_PageHandle;
auto borrowedChildNode = getIxNode(indexHandle, borrowedChildPageNumInt, borrowedChildPage);
borrowedChildNode->parent = aimNodePageNum;
MarkDirty(indexHandle->fileHandle, borrowedChildPage);
UnpinPage(borrowedChildPage);
delete borrowedChildPage; // set borrowed child's parent
}
} else {
if (leftSiblingNode == nullptr) {
leftSiblingNode = aimNode;
leftSiblingKeyList = aimNodeKeyList;
leftSiblingChildList = aimNodeRidList;
leftSiblingPageNum = aimNodePageNum;
leftSiblingPage = aimNodePage;
// leftSibling = aimNode
aimNode = rightSiblingNode;
aimNodeKeyList = rightSiblingKeyList;
aimNodeRidList = rightSiblingChildList;
aimNodePageNum = rightSiblingPageNum;
aimNodePage = rightSiblingPage;
// aimNode = rightSibling
hasLeftSibling = true;
hasRightSibling = false;
numAsChild++;
} // to ensure aim node always has a left sibling
// if (aimNodePageNum == 3282) {
// PageNum tmpNum;
// auto tmpPage = new PF_PageHandle;
// IX_Node * tmpNode;
// char * tmpKeyList, * tmpChildren;
// char * tmp_src_data;
//
// tmpNum = 3282;
// tmpNode = getIxNode(indexHandle, tmpNum, tmpPage);
// GetData(tmpPage, &tmp_src_data);
// tmpKeyList = tmp_src_data + tmpNode->keys_offset;
// tmpChildren = tmp_src_data + tmpNode->rids_offset;
// }
if (aimNode == nullptr) {
return FAIL; // this would never happen
} else if (aimNode->is_leaf) {
memcpy(leftSiblingKeyList + keyLength * leftSiblingNode->keynum, aimNodeKeyList, keyLength * aimNode->keynum);
memcpy(leftSiblingChildList + sizeof(RID) * leftSiblingNode->keynum, aimNodeRidList, sizeof(RID) * aimNode->keynum);
leftSiblingNode->keynum += aimNode->keynum;
// addall
removeFromList(keyLength, parentKeyList, parentNode->keynum, dumpKey, numAsChild - 1);
removeFromList(sizeof(PageNum), parentChildren, parentNode->keynum + 1, dumpPageNum, numAsChild);
parentNode->keynum--;
leftSiblingNode->brother = aimNode->brother;
} else {
char downParentKey[keyLength];
int leftSiblingNodeChildNum = leftSiblingNode->keynum + 1;
int aimNodeChildNum = aimNode->keynum + 1;
getFromList(keyLength, parentKeyList, downParentKey, numAsChild - 1);
addToList(keyLength, leftSiblingKeyList, leftSiblingNode->keynum, downParentKey, leftSiblingNode->keynum);
leftSiblingNode->keynum++;
memcpy(leftSiblingKeyList + keyLength * leftSiblingNode->keynum, aimNodeKeyList, keyLength * aimNode->keynum);
leftSiblingNode->keynum += aimNode->keynum;
leftSiblingNode->brother = aimNode->brother;
for (int i = 0; i < aimNodeChildNum; i++) {
PageNum curChildPageNum;
memcpy(&curChildPageNum, aimNodeRidList + sizeof(PageNum) * i, sizeof(PageNum));
auto curChildPage = new PF_PageHandle;
auto curChildNode = getIxNode(indexHandle, curChildPageNum, curChildPage);
curChildNode->parent = leftSiblingPageNum;
MarkDirty(indexHandle->fileHandle, curChildPage);
UnpinPage(curChildPage);
delete curChildPage;
}
memcpy(leftSiblingChildList + sizeof(PageNum) * leftSiblingNodeChildNum, aimNodeRidList, sizeof(PageNum) * (aimNode->keynum + 1));
// add all children
removeFromList(sizeof(PageNum), parentChildren, parentNode->keynum + 1, dumpPageNum, numAsChild);
removeFromList(keyLength, parentKeyList, parentNode->keynum, dumpKey, numAsChild - 1);
parentNode->keynum--;
}
// if (aimNodePageNum == 3144) {
// PageNum tmpNum;
// auto tmpPage = new PF_PageHandle;
// IX_Node * tmpNode;
// char * tmpKeyList, * tmpChildren;
// char * tmp_src_data;
//
// tmpNum = 2795;
// tmpNode = getIxNode(indexHandle, tmpNum, tmpPage);
// GetData(tmpPage, &tmp_src_data);
// tmpKeyList = tmp_src_data + tmpNode->keys_offset;
// tmpChildren = tmp_src_data + tmpNode->rids_offset;
// printf("??");
// printf("???");
// }
DisposePage(indexHandle->fileHandle, aimNodePageNum);
}
if (hasLeftSibling) {
MarkDirty(indexHandle->fileHandle, leftSiblingPage);
UnpinPage(leftSiblingPage);
delete leftSiblingPage;
}
if (hasRightSibling) {
MarkDirty(indexHandle->fileHandle, rightSiblingPage);
UnpinPage(rightSiblingPage);
delete rightSiblingPage;
}
MarkDirty(indexHandle->fileHandle, aimNodePage);
UnpinPage(aimNodePage);
delete aimNodePage;
aimNode = parentNode;
aimNodeKeyList = parentKeyList;
aimNodeRidList = parentChildren;
aimNodePageNum = parentPageNum;
aimNodePage = parentPage;
parentPage = new PF_PageHandle;
// aimNode = parentNode
isValid = checkValid(aimNode, order);
}
MarkDirty(indexHandle->fileHandle, aimNodePage);
UnpinPage(aimNodePage);
delete aimNodePage;
auto rootPageHandle = new PF_PageHandle;
auto rootNode = getIxNode(indexHandle, indexHandle->fileHeader->rootPage, rootPageHandle);
if (rootNode->keynum == 0) {
char * rootSrcData;
GetData(rootPageHandle, &rootSrcData);
auto rootChild = rootSrcData + rootNode->rids_offset;
PageNum rootFirstChild = 0;
memcpy(&rootFirstChild, rootChild, sizeof(PageNum));
auto rootFirstChildPageHandle = new PF_PageHandle;
auto rootFirstChildNode = getIxNode(indexHandle, rootFirstChild, rootFirstChildPageHandle);
rootFirstChildNode->parent = 0;
rootFirstChildNode->brother = 0;
MarkDirty(indexHandle->fileHandle, rootFirstChildPageHandle);
UnpinPage(rootFirstChildPageHandle);
delete rootFirstChildPageHandle;
DisposePage(indexHandle->fileHandle, indexHandle->fileHeader->rootPage);
indexHandle->fileHeader->rootPage = rootFirstChild;
MarkDirty(indexHandle->fileHandle, indexHandle->headerPage);
}
UnpinPage(rootPageHandle);
delete rootPageHandle;
delete parentPage;
return SUCCESS;
}
void traverseAll(IX_IndexHandle *indexHandle) {
PageNum currentPage = indexHandle->fileHeader->rootPage;
int keyLength = indexHandle->fileHeader->keyLength;
int attrLength = indexHandle->fileHeader->attrLength;
auto currentNodePage = new PF_PageHandle;
auto currentNode = getIxNode(indexHandle, currentPage, currentNodePage);
char *src_data;
while (!currentNode->is_leaf) {
GetData(currentNodePage, &src_data);
// Get that data