//Creating a table should create the underlying page file and store information about the schema, free-space, ... and so on in the Table Information pages
RC createTable (char *name, Schema *schema){
createPageFile(name);
SM_PageHandle ph;
openPageFile(name, &fh);
ensureCapacity(1, &fh);
ph=schemaToString(schema);
writeCurrentBlock(&fh,ph);
calSlotSize(schema);
calPageHeader(schema);
closePageFile(&fh);
return RC_OK;
}
RC forcePage (BM_BufferPool *const bm, BM_PageHandle *const page)
{
SM_FileHandle fH;
int code = openPageFile(bm->pageFile, &fH);
if(code != RC_OK)
return code;
appendEmptyBlock(&fH);
code = writeBlock(page->pageNum, &fH, page->data);
if(code != RC_OK)
return code;
closePageFile(&fH);
metaData.numWriteIO++;
return RC_OK;
}
//writing data and flushing pool
RC forceFlushPool(BM_BufferPool *const bm)
{
sd = (Structure_Details *)bm->mgmtData;
int i=0;
while(i<buffpg_size)
{
if((sd[i].dirtyPage == 1) && (sd[i].fixedcount == 0)) // //checks all dirty pages (with fix count 0)
{
openPageFile (bm->pageFile, &fh);
writeBlock (sd[i].pagenum, &fh, sd[i].data); // writing to disk from the buffer pool.
sd[i].dirtyPage = 0;
writeIO++;
}
i++;
}
return RC_OK;
}
RC forceFlushPool(BM_BufferPool *const bm)
{
Data_Structure *ds = (Data_Structure *)bm->mgmtData;
//printf("\nforceFlushPool");
int i;
for(i=0;i<bufferSize;i++)
{
if(ds[i].dirtybit == 1 && ds[i].fixedcnt == 0)
{
SM_FileHandle fh;
openPageFile (bm->pageFile, &fh);
writeBlock (ds[i].pagenum, &fh, ds[i].data);
ds[i].dirtybit = 0;
writecnt++;
}
}
return RC_OK;
}
RC forcePage (BM_BufferPool *const bm, BM_PageHandle *const page)
{
Data_Structure *ds = (Data_Structure *)bm->mgmtData;
//printf("\nforcePage");
int i;
for(i=0;i<bufferSize;i++)
{
if(ds[i].pagenum == page->pageNum)
{
SM_FileHandle fh;
openPageFile (bm->pageFile, &fh);
writeBlock (ds[i].pagenum, &fh, ds[i].data);
ds[i].dirtybit = 0;
writecnt++;
}
}
return RC_OK;
}
// Buffer Manager Interface Pool Handling
// ***************************************
RC initBufferPool(BM_BufferPool *const bm, const char *const pageFileName,
const int numPages, ReplacementStrategy strategy,
void *stratData)
{
BM_Pool_MgmtData *mgmtData;
int i;
// Initialize Pool
bm->pageFile= strdup(pageFileName);
bm->numPages= numPages;
bm->strategy= strategy;
// Initialize Pool Mgmt Data
mgmtData= MAKE_POOL_MGMTDATA();
mgmtData->io_reads= 0;
mgmtData->io_writes= 0;
mgmtData->stratData.fifoLastFreeFrame= -1;
mgmtData->stratData.lru_head= NULL;
mgmtData->stratData.lru_tail= NULL;
mgmtData->stratData.clockCurrentFrame= -1;
openPageFile(bm->pageFile, &mgmtData->fh);
initPageTable(&mgmtData->pt_head);
// Create Pool pages and initialize them
mgmtData->pool = MAKE_BUFFER_POOL(numPages);
for (i=0; i<numPages; i++)
{
mgmtData->pool[i].dirty= FALSE;
mgmtData->pool[i].fixCount= 0;
mgmtData->pool[i].pn= NO_PAGE;
// Add all frames in LRU list
// representing free frame to use.
appendMRUFrame(&mgmtData->stratData, &mgmtData->pool[i]);
mgmtData->pool[i].clockReplaceFlag= TRUE;
}
bm->mgmtData= mgmtData;
// Initialize thread lock
pthread_mutex_init(&mgmtData->bm_mutex, NULL);
RETURN(RC_OK);
}
RC initBufferPool(BM_BufferPool *const bm, const char *const pageFileName, const int numPages, ReplacementStrategy strategy, void *stratData)
{
// Initialize buffer pool
bm->pageFile = (char *)malloc(strlen(pageFileName) + 1);
strcpy(bm->pageFile, pageFileName);
bm->numPages = numPages;
bm->strategy = strategy;
// Initialize management data for buffer pool
BM_MgmtData *mgmtData;
mgmtData = MAKE_MGMTDATA();
mgmtData->ioWrites = 0;
mgmtData->ioReads = 0;
mgmtData->head = NULL;
// Open page file for buffer mgmt
openPageFile(bm->pageFile, &mgmtData->fh);
// Initialize frame pool
mgmtData->framePool = MAKE_FRAME_POOL(numPages);
int i;
for (i = 0; i < numPages; i++) {
mgmtData->framePool[i].frameID = i;
mgmtData->framePool[i].isDirty = FALSE;
mgmtData->framePool[i].fixCount = 0;
mgmtData->framePool[i].pageNum = NO_PAGE;
mgmtData->framePool[i].memPage = (SM_PageHandle)malloc(PAGE_SIZE);
}
// For LRU and FIFO
BM_Node *head = newNode(&mgmtData->framePool[0]);
BM_Frame *frame = NULL;
for(i = 1; i < bm->numPages; i++){
frame = &mgmtData->framePool[i];
insertAtHead(&head, frame);
}
mgmtData->head = head;
bm->mgmtData = mgmtData;
return RC_OK;
}
/* Try to create, open, and close a page file */
void
testSinglePageContent(void)
{
SM_FileHandle fh;
SM_PageHandle ph;
int i;
testName = "test single page content";
ph = (SM_PageHandle) malloc(PAGE_SIZE);
// create a new page file
TEST_CHECK(createPageFile (TESTPF));
TEST_CHECK(openPageFile (TESTPF, &fh));
printf("created and opened file\n");
// read first page into handle
TEST_CHECK(readFirstBlock (&fh, ph));
// the page should be empty (zero bytes)
for (i=0; i < PAGE_SIZE; i++)
ASSERT_TRUE((ph[i] == 0), "expected zero byte in first page of freshly initialized page");
printf("first block was empty\n");
// change ph to be a string and write that one to disk
for (i=0; i < PAGE_SIZE; i++)
ph[i] = (i % 10) + '0';
TEST_CHECK(writeBlock (0, &fh, ph));
printf("writing first block\n");
// read back the page containing the string and check that it is correct
TEST_CHECK(readFirstBlock (&fh, ph));
for (i=0; i < PAGE_SIZE; i++)
ASSERT_TRUE((ph[i] == (i % 10) + '0'), "character in page read from disk is the one we expected.");
printf("reading first block\n");
// destroy new page file
TEST_CHECK(destroyPageFile (TESTPF));
free(ph);
ph=NULL;
TEST_DONE();
}
/* Name: InitBufferPool
* Behavior:Would initialize a new buffer pool and if buffer pool exists , it share with new pool handler
* Version: 1.0.0 */
RC initBufferPool(BM_BufferPool *const bm, const char *const pageFileName,const int numPages, ReplacementStrategy strategy,void *stratData)
{
RC ret=RC_OK;
Buffer_page_Dtl *bf_pg_dtl;
BufferPool_Node *_buffernode;
BM_BufferPool *tempPool;
SM_FileHandle *sh;
// pthread_mutex_lock(&work_mutex_init); //1st Incoming thread hold a lock.
_buffernode=checkActiveBufferPools(BP_StNode_ptr,pageFileName);
if(_buffernode==NULL)
{
sh=(SM_FileHandle *)malloc(sizeof(SM_FileHandle));
if(sh==NULL)
{
return RC_FILE_HANDLE_NOT_INIT;
}
openPageFile(pageFileName,sh);
bm->pageFile=pageFileName;
bm->numPages=numPages;
bm->strategy=strategy;
bm->mgmtData=sh;
bf_pg_dtl=initializebufferdetails(numPages);
ret=bf_pg_dtl!=NULL?RC_OK:RC_FILE_HANDLE_NOT_INIT;
if(insert_node(&BP_StNode_ptr,bm,bf_pg_dtl)==FALSE)
ret=RC_FILE_HANDLE_NOT_INIT;
}
else
{
tempPool=_buffernode->buffer_pool_ptr;
bm->pageFile=pageFileName;
bm->numPages=numPages;
bm->strategy=strategy;
bm->mgmtData=tempPool->mgmtData;
bf_pg_dtl=_buffernode->buffer_page_dtl;
if(insert_node(&BP_StNode_ptr,bm,bf_pg_dtl)==FALSE)
ret=RC_FILE_HANDLE_NOT_INIT;
}
// pthread_mutex_unlock(&work_mutex_init);//1st Incoming thread release a lock.
return ret;
}
RC forcePage (BM_BufferPool *const bm, BM_PageHandle *const page)
{
//current frame2file
buffer *bf = bm->mgmtData;
SM_FileHandle fHandle;
RC rt_value;
rt_value = openPageFile(bm->pageFile, &fHandle);
if (rt_value!=RC_OK) return RC_FILE_NOT_FOUND;
rt_value = writeBlock(page->pageNum, &fHandle, page->data);
if (rt_value!=RC_OK)
{
closePageFile(&fHandle);
return RC_FILE_NOT_FOUND;
}
bf->numWrite++;
closePageFile(&fHandle);
return RC_OK;
}
//called at the time of replacement of pages in page frame
RC updatePage(BM_BufferPool *const bm,BM_PageHandle *const page,pageFrame *node,const PageNumber pageNum){
bufferPoolInfo *mgmtInfo = getMgmtInfo(bm);
RC flag;
SM_FileHandle fileHandle;
if(bm!=NULL){
if ((flag = openPageFile ((char *)(bm->pageFile), &fileHandle)) == RC_OK){
//if page to be replaced is dirty then write it back to disk before replacement
if(node->dirtyBit){
ensureCapacity(pageNum, &fileHandle);
if((flag = writeBlock(node->pageNumber,&fileHandle, node->data)) == RC_OK){
(mgmtInfo->numWriteIO)+=1;
}else{
return flag;
}
}
//ensuing capacity of file before reading the page from file
ensureCapacity(pageNum, &fileHandle);
//reading the pageNum from file to data field.
if((flag = readBlock(pageNum, &fileHandle, node->data)) == RC_OK){
(mgmtInfo->pagesToPageFrame)[node->pageNumber] = NO_PAGE;
node->pageNumber = pageNum;
(mgmtInfo->pagesToPageFrame)[node->pageNumber] = node->pageFrameNo;
(mgmtInfo->pageFramesToPage)[node->pageFrameNo] = node->pageNumber;
node->dirtyBit = false;
node->fixedCount = 1;
page->pageNum = pageNum;
page->data = node->data;
mgmtInfo->numReadIO+=1;
}else{
return flag;
}
return RC_OK;
}else{
return flag;
}
}else{
RC_message="Buffer is not initialized ";
return RC_BUFFER_NOT_INITIALIZED;
}
}
RC openBtree (BTreeHandle **tree, char *idxId){
DataType keyType;
int rootPage;
int nodeNum;
int entryNum;
int n;
BM_BufferPool *bufferPool = MAKE_POOL();
SM_FileHandle *fHandle = (SM_FileHandle *)calloc(1, sizeof(SM_FileHandle));
char * metadata = (char *)calloc(PAGE_SIZE, sizeof(char));
openPageFile(idxId, fHandle);
initBufferPool(bufferPool, idxId, 10, RS_LRU, NULL);
readBlock(0, fHandle, metadata);
memcpy(&rootPage, metadata,sizeof(int));
memcpy(&nodeNum, metadata+sizeof(int),sizeof(int));
memcpy(&entryNum, metadata+2*sizeof(int),sizeof(int));
memcpy(&n, metadata+3*sizeof(int),sizeof(int));
memcpy(&keyType, metadata + 4*sizeof(int),sizeof(DataType));
*tree = (BTreeHandle *)calloc(1, sizeof(BTreeHandle));
(*tree)->keyType = keyType;
(*tree)->rootPage = rootPage;
(*tree)->nodeNum = nodeNum;
(*tree)->entryNum = entryNum;
(*tree)->n = n;
(*tree)->bufferPool = bufferPool;
(*tree)->fileHandle = fHandle;
(*tree)->idxId = idxId;
free(metadata);
return RC_OK;
}
void LRU(BM_BufferPool *const bm, Structure_Details *node)
{
sd=(Structure_Details *) bm->mgmtData;
int i=0;
int prev;
int minimum;
while(i<buffpg_size)
{
if(sd[i].fixedcount == 0)
{
prev= i;
minimum = sd[i].freq_used;
break;
}
i++;
}
i=prev+1;
while(i<buffpg_size)
{
if(sd[i].freq_used < minimum)
{
prev = i;
minimum = sd[i].freq_used;
}
i++;
}
if(sd[prev].dirtyPage == 1) // checks if dirty page present and writes it to disk
{
openPageFile (bm->pageFile, &fh);
writeBlock (sd[prev].pagenum, &fh, sd[prev].data);
writeIO++;
}
sd[prev].data = node->data;
sd[prev].pagenum = node->pagenum;
sd[prev].dirtyPage = node->dirtyPage;
sd[prev].fixedcount = node->fixedcount;
sd[prev].freq_used = node->freq_used;
}
/* Try to create, open, and close a page file */
void testWrite(void)
{
SM_FileHandle fh;
SM_PageHandle ph;
int i;
testName = "test single page content";
ph = (SM_PageHandle) malloc(PAGE_SIZE);
// create a new page file
TEST_CHECK(createPageFile (TESTPF));
TEST_CHECK(openPageFile (TESTPF, &fh));
printf("created and opened file\n");
TEST_CHECK(ensureCapacity(5,&fh));
for (i=0; i < PAGE_SIZE; i++)
ph[i] = (i % 10) + '0';
ASSERT_TRUE((fh.totalNumPages == 5), "expect 5 pages in new file");
TEST_CHECK(writeBlock (5, &fh, ph));
// read back the page containing the string and check that it is correct
TEST_CHECK(readBlock (5,&fh, ph));
printf("\nreading :");
for (i=0; i < PAGE_SIZE; i++)
ASSERT_TRUE((ph[i] == (i % 10) + '0'), "character in page read from disk is the one we expected.");
// destroy new page file
TEST_CHECK(destroyPageFile (TESTPF));
TEST_DONE();
}
RC forceFlushPool (BM_BufferPool *const bm)
{
int i = 0;
resetPages();
SM_FileHandle fh;
RC code = openPageFile(bm->pageFile, &fh);
if (code != RC_OK)
return code;
for(i = 0; i < bm->numPages; i++){
if (pages->isMark && pages->pageNum > -1){
pages->isMark = false;
}
if(i < bm->numPages-1){
pages = pages->nextPage;
}
}
resetPages();
closePageFile(&fh);
return RC_OK;
}
void lru(BM_BufferPool *const bm, Data_Structure *newnode)
{
//printf("\nInside lru function");
Data_Structure *ds=(Data_Structure *) bm->mgmtData;
int i,front, min;
for(i=0;i<bufferSize;i++)
{
if(ds[i].fixedcnt == 0)
{
front= i;
min = ds[i].hitnum;
break;
}
}
for(i=front+1;i<bufferSize;i++)
{
if(ds[i].hitnum < min)
{
front = i;
min = ds[i].hitnum;
}
}
if(ds[front].dirtybit == 1)
{
SM_FileHandle fh;
openPageFile (bm->pageFile, &fh);
writeBlock (ds[front].pagenum, &fh, ds[front].data);
writecnt++;
}
ds[front].data = newnode->data;
ds[front].pagenum = newnode->pagenum;
ds[front].dirtybit = newnode->dirtybit;
ds[front].fixedcnt = newnode->fixedcnt;
ds[front].hitnum = newnode->hitnum;
}
RC createBtree (char *idxId, DataType keyType, int n){
SM_FileHandle *fHandle = (SM_FileHandle *)calloc(1, sizeof(SM_FileHandle));
char *metadata = (char *)calloc(1, PAGE_SIZE);
int rootPage;
int nodeNum;
int entryNum;
createPageFile(idxId);
openPageFile(idxId, fHandle);
ensureCapacity(1, fHandle);
rootPage = -1;
nodeNum = 0;
entryNum = 0;
/*
* root page number
* the number of node
* the number of entry
* n
* key type
*/
memcpy(metadata, &rootPage, sizeof(int));
memcpy(metadata + sizeof(int), &nodeNum, sizeof(int));
memcpy(metadata + 2*sizeof(int), &entryNum, sizeof(int));
memcpy(metadata + 3*sizeof(int), &n, sizeof(int));
memcpy(metadata + 4*sizeof(int), &keyType, sizeof(DataType));
writeBlock(0, fHandle, metadata);
free(fHandle);
free(metadata);
return RC_OK;
}
stasis_page_handle_t* stasis_page_handle_deprecated_factory(stasis_log_t *log, stasis_dirty_page_table_t *dpt) {
printf("\nWarning: Using old I/O routines (with known bugs).\n");
return openPageFile(log, dpt);
}
/* Try to create, open, and close a multi-page file */
void
testMultiPageContent(void)
{
SM_FileHandle fh;
SM_PageHandle ph;
int i;
testName = "test multi-page content";
ph = (SM_PageHandle) malloc(PAGE_SIZE);
// create a new page file
TEST_CHECK(createPageFile (TESTPF));
TEST_CHECK(openPageFile (TESTPF, &fh));
printf("created and opened file\n");
//ensure the capacity of the file with 4 pages
TEST_CHECK(ensureCapacity(4,&fh));
// read the current page into handle
TEST_CHECK(readCurrentBlock(&fh, ph));
// the page should be empty (zero bytes)
for (i=0; i < PAGE_SIZE; i++)
ASSERT_TRUE((ph[i] == 0), "expected zero byte in current page of freshly initialized page");
printf("current block was empty with the page number =%d\n", getBlockPos(&fh));
// read the next page into handle
TEST_CHECK(readNextBlock(&fh, ph));
// the page should be empty (zero bytes)
for (i=0; i < PAGE_SIZE; i++)
ASSERT_TRUE((ph[i] == 0), "expected zero byte in next page of freshly initialized page");
printf("the next block was empty\n");
printf("the updated page number is =%d\n",getBlockPos(&fh));
// change ph to be a string and write that one to disk
for (i=0; i < PAGE_SIZE; i++)
ph[i] = (i % 10) + '0';
TEST_CHECK(writeCurrentBlock(&fh, ph));
printf("writing current block with the page number =%d\n", getBlockPos(&fh));
// read back the page containing the string and check that it is correct
TEST_CHECK(readCurrentBlock (&fh, ph));
for (i=0; i < PAGE_SIZE; i++)
ASSERT_TRUE((ph[i] == (i % 10) + '0'), "character in page read from disk is the one we expected.");
printf("reading back current block into memory with page number =%d\n", getBlockPos(&fh));
// read the last page into handle
TEST_CHECK(readLastBlock(&fh, ph));
// the page should be empty (zero bytes)
for (i=0; i < PAGE_SIZE; i++)
ASSERT_TRUE((ph[i] == 0), "expected zero byte in last page of freshly initialized page");
printf("last block was empty with the page number =%d\n", getBlockPos(&fh));
// change ph to be a string and write that one to disk
for (i=0; i < PAGE_SIZE; i++)
ph[i] = (i % 10) + '0';
TEST_CHECK(writeCurrentBlock(&fh, ph));
printf("writing current block with the page number =%d\n", getBlockPos(&fh));
// read back the page containing the string and check that it is correct
TEST_CHECK(readCurrentBlock (&fh, ph));
for (i=0; i < PAGE_SIZE; i++)
ASSERT_TRUE((ph[i] == (i % 10) + '0'), "character in page read from disk is the one we expected.");
printf("reading back current block into memory with page number =%d\n", getBlockPos(&fh));
// destroy new page file
TEST_CHECK(destroyPageFile (TESTPF));
TEST_DONE();
}
RC pinPage (BM_BufferPool *const bm, BM_PageHandle *const page, const PageNumber pageNum)
{
int i;
resetPages();
int spotFound = -1;
for(i = 0; i < bm->numPages; i++){
if(pages->pageNum == -1){
spotFound = i;
break;
}
if(pages->pageNum == pageNum){
spotFound = i;
break;
}
if(i < bm->numPages-1){
pages = pages->nextPage;
}
}
int min = 999999;
if (spotFound == -1) {
resetPages();
for (i = 0; i < bm->numPages; i++) {
if (pages->fixCount == 0 && pages->repStrat < min) {
min = pages->repStrat;
spotFound = i;
}
if(i < bm->numPages-1){
pages = pages->nextPage;
}
}
}
resetPages();
for(i = 0; i < bm->numPages; i++){
if(i == spotFound)
break;
if(i < bm->numPages-1){
pages = pages->nextPage;
}
}
SM_FileHandle fH;
openPageFile(bm->pageFile, &fH);
if(pages->pageNum == pageNum){
if(bm->strategy == RS_LRU)
pages->repStrat = ++(metaData.totalRepStrat);
pages->fixCount++;
page->pageNum = pageNum;
strcpy(page->data, pages->pageData);
}else {
page->data = malloc(PAGE_SIZE);
page->pageNum = pageNum;
readBlock(pageNum, &fH, page->data);
metaData.numReadIO++;
pages->pageNum = pageNum;
pages->fixCount = 1;
pages->repStrat = ++(metaData.totalRepStrat);
pages->isMark = false;
}
closePageFile(&fH);
return RC_OK;
}
//pinPage
RC pinPage (BM_BufferPool *const bm, BM_PageHandle *const page, const PageNumber pageNum)
{
sd = (Structure_Details *)bm->mgmtData;
if(sd[0].pagenum == -1)
{
openPageFile (bm->pageFile, &fh);
sd[0].data = (SM_PageHandle) malloc(PAGE_SIZE);
ensureCapacity(pageNum,&fh);
readBlock(pageNum, &fh, sd[0].data);
sd[0].pagenum = pageNum;
sd[0].fixedcount++;
n = 0;
strike = 0;
sd[0].freq_used = strike;
sd[0].nr = 0;
page->pageNum = pageNum;
page->data = sd[0].data;
return RC_OK;
}
else
{
int i=0;
int buffer_check = 0;
while(i<buffpg_size)
{
if(sd[i].pagenum != -1)
{
if(sd[i].pagenum == pageNum)
{
sd[i].fixedcount++;
buffer_check = 1;
strike++;
if(bm->strategy == RS_LRU)
sd[i].freq_used = strike;
page->pageNum = pageNum;
page->data = sd[i].data;
break;
}
}
else
{
openPageFile (bm->pageFile, &fh);
sd[i].data = (SM_PageHandle) malloc(PAGE_SIZE);
readBlock(pageNum, &fh, sd[i].data);
sd[i].pagenum = pageNum;
sd[i].fixedcount = 1;
sd[i].nr = 0;
n++;
strike++;
if(bm->strategy == RS_LRU)
sd[i].freq_used = strike;
page->pageNum = pageNum;
page->data = sd[i].data;
buffer_check = 1;
break;
}
i++;
}
if(buffer_check == 0)
{
pin = (Structure_Details *)malloc(sizeof(Structure_Details));
openPageFile (bm->pageFile, &fh);
pin->data = (SM_PageHandle) malloc(PAGE_SIZE);
readBlock(pageNum, &fh, pin->data);
pin->pagenum = pageNum;
pin->dirtyPage = 0;
pin->fixedcount = 1;
pin->nr = 0;
n++;
strike++;
if(bm->strategy == RS_LRU )
pin->freq_used = strike;
page->pageNum = pageNum;
page->data = pin->data;
if(bm->strategy == RS_FIFO)
{
FIFO(bm,pin);
}
else if (bm->strategy == RS_LRU)
{
LRU(bm,pin);
}
else
{
return RC_ALGORITHM_NOT_IMPLEMENTED;
}
}
return RC_OK;
}
}
/**************************************************************************************
* Function Name: appendPage
*
* Description:
* Read the requested page from the disk and append it to the tail of the PageList
*
* Parameters:
* BM_BufferPool * const bm: Buffer Pool Handler
* BM_PageHandle * const page: Buffer Page Handler
* PageNumber pageNum: the page number of the requested page
*
* Return:
* RC: return code
*
* Author:
* Xin Su <*****@*****.**>
*
* History:
* Date Name Content
* ---------- ---------------------------------- ------------------------
* 2015-03-15 Xin Su <*****@*****.**> Initialization
* 2015-03-26 Xin Su <*****@*****.**> Add thread read-write lock
**************************************************************************************/
RC appendPage(BM_BufferPool * const bm, BM_PageHandle * const page,
PageNumber pageNum) {
PageList *queue = (PageList *) bm->mgmtData;
RC rc; // init return code
// Require lock
pthread_rwlock_init(&rwlock, NULL);
pthread_rwlock_wrlock(&rwlock);
// Open File
rc = -99;
rc = openPageFile(bm->pageFile, F_HANDLE);
if (rc != RC_OK) {
return rc;
}
// if the size of the PageList = 0, then the PageList is empty, add this requested page as the head
// else, the PageList is neither empty nor full, add the requested page to next of the tail of the PageList
if (queue->size == 0) {
queue->head->fixCount = 1;
queue->head->numWriteIO = 1;
// if the page does not exist, then call ensureCapacity to add the requested page to the file
if (F_HANDLE->totalNumPages < pageNum + 1) {
int totalPages = F_HANDLE->totalNumPages;
rc = -99;
rc = ensureCapacity(pageNum + 1, F_HANDLE);
NUM_WRITE_IOS += pageNum + 1 - totalPages;
if (rc != RC_OK) {
// Do not change fixCount and NumWriteIO back, for this indicates write IO error and need more info to proceed
// Close file
rc = -99;
rc = closePageFile(F_HANDLE);
if (rc != RC_OK) {
return rc;
}
// Release lock
pthread_rwlock_unlock(&rwlock);
pthread_rwlock_destroy(&rwlock);
return rc;
}
}
queue->head->numWriteIO = 0;
// After ensureCapacity, now we can read the requested page from the file
queue->head->numReadIO++;
rc = -99;
rc = readBlock(pageNum, F_HANDLE, queue->head->page->data);
NUM_READ_IOS++;
queue->head->numReadIO--;
if (rc != RC_OK) {
// Do not change fixCount and NumWriteIO back, for this indicates write IO error and need more info to proceed
// Close file
rc = -99;
rc = closePageFile(F_HANDLE);
if (rc != RC_OK) {
return rc;
}
// Release lock
pthread_rwlock_unlock(&rwlock);
pthread_rwlock_destroy(&rwlock);
return rc;
}
// Now the fixCount = 1, the numReadIO = 0, and the numWriteIO = 0
queue->head->page->pageNum = pageNum;
queue->head->dirtyFlag = FALSE;
queue->head->clockFlag = FALSE;
// Now there is only 1 page in the PageList, and all pointers , including the current pointer, are pointing to it
} else {
queue->tail->next->fixCount = 1;
queue->tail->next->numWriteIO = 1;
// if the page does not exist, then call ensureCapacity to add the requested page to the file
if (F_HANDLE->totalNumPages < pageNum + 1) {
int totalPages = F_HANDLE->totalNumPages;
rc = -99;
rc = ensureCapacity(pageNum + 1, F_HANDLE);
NUM_WRITE_IOS += pageNum + 1 - totalPages;
if (rc != RC_OK) {
// Do not change fixCount and NumWriteIO back, for this indicates write IO error and need more info to proceed
// Close file
rc = -99;
rc = closePageFile(F_HANDLE);
if (rc != RC_OK) {
return rc;
}
// Release lock
pthread_rwlock_unlock(&rwlock);
pthread_rwlock_destroy(&rwlock);
return rc;
}
}
queue->tail->next->numWriteIO = 0;
// After ensureCapacity, now we can read the requested page from the file
queue->tail->next->numReadIO++;
rc = -99;
rc = readBlock(pageNum, F_HANDLE, queue->tail->next->page->data);
NUM_READ_IOS++;
queue->tail->next->numReadIO--;
if (rc != RC_OK) {
// Do not change fixCount and NumWriteIO back, for this indicates write IO error and need more info to proceed
// Close file
rc = -99;
rc = closePageFile(F_HANDLE);
if (rc != RC_OK) {
return rc;
}
// Release lock
pthread_rwlock_unlock(&rwlock);
pthread_rwlock_destroy(&rwlock);
return rc;
}
// Now the fixCount = 1, the numReadIO = 0, and the numWriteIO = 0
queue->tail->next->page->pageNum = pageNum;
queue->tail->next->dirtyFlag = FALSE;
queue->tail->next->clockFlag = FALSE;
queue->tail = queue->tail->next;
// Set the current pointer to the requested page, that is the tail of the PageList
queue->current = queue->tail;
}
// After appending the requested page, Increment the size of the PageList
queue->size++;
// Load the requested page into BM_PageHandle
page->data = queue->current->page->data;
page->pageNum = queue->current->page->pageNum;
// Close file
rc = -99;
rc = closePageFile(F_HANDLE);
if (rc != RC_OK) {
return rc;
}
// Release lock
pthread_rwlock_unlock(&rwlock);
pthread_rwlock_destroy(&rwlock);
return RC_OK;
} // appendPage
/**************************************************************** * Function Name: myTestAssign1 * * Description: Additional tests for Storage Manager. * * Parameter: void * * Return: void * * Author: Dhruvit Modi ([email protected]) * Monika Priyadarshani ([email protected]) ****************************************************************/ void myTestAssign1(void) { SM_FileHandle fh; SM_PageHandle ph; int i; ph = (SM_PageHandle) malloc(PAGE_SIZE); // create a new page file TEST_CHECK(createPageFile (TESTPF)); TEST_CHECK(openPageFile (TESTPF, &fh)); printf("created and opened file\n"); for (i=0; i < PAGE_SIZE; i++) ph[i] = (i % 10) + '0'; // write on the first block TEST_CHECK(writeCurrentBlock (&fh, ph)); printf("writing first block\n"); // append empty block TEST_CHECK(appendEmptyBlock(&fh)); printf("append Empty block\n"); // write on the second block TEST_CHECK(writeBlock (1, &fh, ph)); printf("writing second block\n"); TEST_CHECK(appendEmptyBlock(&fh)); printf("append Empty block\n"); // write to the third block TEST_CHECK(writeBlock (2, &fh, ph)); printf("writing third block\n"); // read back the page containing the string and check that it is correct printf("reading first block\n"); TEST_CHECK(readFirstBlock (&fh, ph)); for (i=0; i < PAGE_SIZE; i++) ASSERT_TRUE((ph[i] == (i % 10) + '0'), "character in page read from disk is the one we expected."); // read back the page containing the string and check that it is correct printf("reading last block\n"); TEST_CHECK(readLastBlock (&fh, ph)); for (i=0; i < PAGE_SIZE; i++) ASSERT_TRUE((ph[i] == (i % 10) + '0'), "character in page read from disk is the one we expected."); // read back the page containing the string and check that it is correct printf("reading previous block\n"); TEST_CHECK(readPreviousBlock (&fh, ph)); for (i=0; i < PAGE_SIZE; i++) ASSERT_TRUE((ph[i] == (i % 10) + '0'), "character in page read from disk is the one we expected."); // read back the page containing the string and check that it is correct printf("reading current block\n"); TEST_CHECK(readCurrentBlock (&fh, ph)); for (i=0; i < PAGE_SIZE; i++) ASSERT_TRUE((ph[i] == (i % 10) + '0'), "character in page read from disk is the one we expected."); // read back the page containing the string and check that it is correct printf("reading next block\n"); TEST_CHECK(readNextBlock (&fh, ph)); for (i=0; i < PAGE_SIZE; i++) ASSERT_TRUE((ph[i] == (i % 10) + '0'), "character in page read from disk is the one we expected."); // append empty block TEST_CHECK(appendEmptyBlock(&fh)); printf("append Empty block\n"); // ensure capacity TEST_CHECK(ensureCapacity(6, &fh)); printf("ensure capacity\n"); // destroy new page file TEST_CHECK(destroyPageFile (TESTPF)); TEST_DONE(); }
/**************************************************************************************
* Function Name: forcePage
*
* Description:
* Write the requested page back to the page file on disk
*
* Parameters:
* BM_BufferPool * const bm: Buffer Pool Handler
* BM_PageHandle * const page: Buffer Page Handler
*
* Return:
* RC: return code
*
* Author:
* Jie Zhou <*****@*****.**>
*
* History:
* Date Name Content
* ---------- ---------------------------------- ----------------------------
* 2015-03-13 Jie Zhou <*****@*****.**> Initialization
* 2015-03-20 Xin Su <*****@*****.**> Modify the logic of forcing to write the requested page back
* Add comments
**************************************************************************************/
RC forcePage(BM_BufferPool * const bm, BM_PageHandle * const page) {
PageList *queue = (PageList *) bm->mgmtData;
RC rc = -99;
// Require lock
pthread_rwlock_init(&rwlock, NULL);
pthread_rwlock_wrlock(&rwlock);
// Open file
rc = -99;
rc = openPageFile(bm->pageFile, F_HANDLE);
if (rc != RC_OK) {
return rc;
}
// First set numWriteIO
queue->current->numWriteIO = 1;
// Write the requested page back to the disk
rc = -99;
rc = writeBlock(page->pageNum, F_HANDLE, page->data);
NUM_WRITE_IOS++;
if (rc != RC_OK) {
// Do not change fixCount and NumWriteIO back, for this indicates write IO error and need more info to proceed
// Close file
rc = -99;
rc = closePageFile(F_HANDLE);
if (rc != RC_OK) {
return rc;
}
// Release unlock
pthread_rwlock_unlock(&rwlock);
pthread_rwlock_destroy(&rwlock);
return rc;
}
// Set the page back to clean
queue->current->dirtyFlag = FALSE;
// The write completes without error, then set numWriteIO back
queue->current->numWriteIO = 0;
// Close file
rc = -99;
rc = closePageFile(F_HANDLE);
if (rc != RC_OK) {
return rc;
}
// Release lock
pthread_rwlock_unlock(&rwlock);
pthread_rwlock_destroy(&rwlock);
return RC_OK;
} // forcePage
//adding one to the fix for the pin page in the buffer pool
//And adding one to each time of mgmtDataLRU in the buffer pool
RC LRU_pinPage(BM_BufferPool *const bm, BM_PageHandle *const page, PageNumber pageNum){
//printf("pin: %d\n", pageNum);
int i;
int ind = LRU_findByPageNumber(bm, pageNum);
//get the system time at pinPage;
clock_t c = clock();
mgmtDataLRU * nodes = (mgmtDataLRU *)bm->mgmtData;
RC _rc;
SM_FileHandle fHandle;
//if the page is in buffer, return the pagehandle
if (ind >= 0){
page->pageNum = pageNum;
page->data = nodes[ind].pagehandle->data;
nodes[ind].time = c;
nodes[ind].fix++;
//printf("page found in buffer: %d\n", ind);
return RC_OK;
}
//if there are free page in the buffer
for(i=0; i<bm->numPages; i++){
if ( nodes[i].pagehandle->pageNum == NO_PAGE){
//printf("%dth page is free\n", i);
nodes[i].pagehandle->pageNum = pageNum;
free(nodes[i].pagehandle->data);
nodes[i].pagehandle->data = (char *)calloc(1, PAGE_SIZE);
_rc = openPageFile(bm->pageFile, &fHandle);
if(_rc != RC_OK){
return _rc;
}
_rc = readBlock(pageNum, &fHandle, nodes[i].pagehandle->data);
closePageFile(&fHandle);
if(_rc == RC_OK){
//printf("page # %d is in disk\n", pageNum);
bm->numOfRead++;
}
nodes[i].fix++;
nodes[i].time = c;
nodes[i].dirty = false;
page->pageNum = pageNum;
page->data = nodes[i].pagehandle->data;
//printf("pinpage succeed, %dth page become page# %d\n", i, page->pageNum);
return RC_OK;
}
}
//if all buffers have data
i = LRU_findTheEariestUnfixedNode(bm);
if (i == -1){
//all buffers are full and occupied
return RC_BM_ALL_PAGE_PINNED;
}
else{
//write the content to disk
if(nodes[i].dirty){
_rc = forcePage(bm,nodes[i].pagehandle);
//bm->numOfWrite++;
}
nodes[i].pagehandle->pageNum = pageNum;
free(nodes[i].pagehandle->data);
nodes[i].pagehandle->data = (char *)calloc(1, PAGE_SIZE);
_rc = openPageFile(bm->pageFile, &fHandle);
if(_rc != RC_OK){
return _rc;
}
_rc = readBlock(pageNum, &fHandle, nodes[i].pagehandle->data);
closePageFile(&fHandle);
if(_rc == RC_OK){
bm->numOfRead++;
}
nodes[i].fix++;
nodes[i].time = c;
nodes[i].dirty = false;
// nodes[i].time = (double)seconds;
page->pageNum = pageNum;
page->data = nodes[i].pagehandle->data;
return RC_OK;
}
}
/**************************************************************************************
* Function Name: replacePage
*
* Description:
* Replace the current page with the requested page read from the disk
*
* Parameters:
* BM_BufferPool * const bm: Buffer Pool Handler
* BM_PageHandle * const page: Buffer Page Handler
* PageNumber pageNum: the page number of the requested page
*
* Return:
* RC: return code
*
* Author:
* Xin Su <*****@*****.**>
*
* History:
* Date Name Content
* ---------- ---------------------------------- ------------------------
* 2015-03-15 Xin Su <*****@*****.**> Initialization
* 2015-03-26 Xin Su <*****@*****.**> Add thread read-write lock
**************************************************************************************/
RC replacePage(BM_BufferPool * const bm, BM_PageHandle * const page,
PageNumber pageNum) {
PageList *queue = (PageList *) bm->mgmtData;
RC rc; // init return code
// Require lock
pthread_rwlock_init(&rwlock, NULL);
pthread_rwlock_wrlock(&rwlock);
// Open file
rc = -99;
rc = openPageFile(bm->pageFile, F_HANDLE);
if (rc != RC_OK) {
return rc;
}
// If the removable page is dirty, then write it back to the disk before remove it.
// Now the fixCount = 0, and the numReadIO = 0 and the numWriteIO = 0
queue->current->fixCount = 1;
queue->current->numWriteIO = 1;
// if the removable page is dirty, then write it back to the file
if (queue->current->dirtyFlag == TRUE) {
rc = -99;
rc = writeBlock(queue->current->page->pageNum, F_HANDLE,
queue->current->page->data);
NUM_WRITE_IOS++;
if (rc != RC_OK) {
// Do not change fixCount and NumWriteIO back, for this indicates write IO error and need more info to proceed
// Close file
rc = -99;
rc = closePageFile(F_HANDLE);
if (rc != RC_OK) {
return rc;
}
// Release unlock
pthread_rwlock_unlock(&rwlock);
pthread_rwlock_destroy(&rwlock);
return rc;
}
// After writeBlock, set the PageFrame back to clean
queue->current->dirtyFlag = FALSE;
}
// if the page does not exist, then call ensureCapacity to add the requested page to the file
if (F_HANDLE->totalNumPages < pageNum + 1) {
int totalPages = F_HANDLE->totalNumPages;
rc = -99;
rc = ensureCapacity(pageNum + 1, F_HANDLE);
NUM_WRITE_IOS += pageNum + 1 - totalPages;
if (rc != RC_OK) {
// Do not change fixCount and NumWriteIO back, for this indicates write IO error and need more info to proceed
// Close file
rc = -99;
rc = closePageFile(F_HANDLE);
if (rc != RC_OK) {
return rc;
}
// Release unlock
pthread_rwlock_unlock(&rwlock);
pthread_rwlock_destroy(&rwlock);
return rc;
}
}
queue->current->numWriteIO = 0;
// After ensureCapacity, now we can read the requested page from the file
queue->current->numReadIO++;
rc = -99;
rc = readBlock(pageNum, F_HANDLE, queue->current->page->data);
NUM_READ_IOS++;
queue->current->numReadIO--;
if (rc != RC_OK) {
// Do not change fixCount and NumWriteIO back, for this indicates write IO error and need more info to proceed
// Close file
rc = -99;
rc = closePageFile(F_HANDLE);
if (rc != RC_OK) {
return rc;
}
// Release lock
pthread_rwlock_unlock(&rwlock);
pthread_rwlock_destroy(&rwlock);
return rc;
}
// Load the requested page to the current PageFrame in the BM_BufferPool
// Now the fixCount = 1, the numReadIO = 0, and the numWriteIO = 0
queue->current->page->pageNum = pageNum;
queue->current->clockFlag = FALSE;
// Load the requested into BM_PageHandle
page->data = queue->current->page->data;
page->pageNum = queue->current->page->pageNum;
// Close file
rc = -99;
rc = closePageFile(F_HANDLE);
if (rc != RC_OK) {
return rc;
}
// Release lock
pthread_rwlock_unlock(&rwlock);
pthread_rwlock_destroy(&rwlock);
return RC_OK;
} // replacePage
RC pinPage (BM_BufferPool *const bm, BM_PageHandle *const page,
const PageNumber pageNum)
{
Data_Structure *ds = (Data_Structure *)bm->mgmtData;
if(ds[0].pagenum == -1)
{
//printf("\nINSIDE ds[0]->pagenum == -1\n");
SM_FileHandle fh;
openPageFile (bm->pageFile, &fh);
ds[0].data = (SM_PageHandle) malloc(PAGE_SIZE);
ensureCapacity(pageNum,&fh);
readBlock(pageNum, &fh, ds[0].data);
ds[0].pagenum = pageNum;
ds[0].fixedcnt++;
rear = 0;
hit = 0;
ds[0].hitnum = hit;
ds[0].numRef = 0;
page->pageNum = pageNum;
page->data = ds[0].data;
/*
printf("\nPinPage function buffer");
int i;
for(i=0;i<bufferSize; i++)
{
printf("\nPagenum: %d fixedcnt: %d dirty: %d",ds[i].pagenum,ds[i].fixedcnt,ds[i].dirtybit);
}*/
return RC_OK;
}
else
{
//printf("\nINSIDE front != NULL\n");
int i,check = 0;
for(i=0;i<bufferSize;i++)
{
if(ds[i].pagenum != -1)
{
if(ds[i].pagenum == pageNum) //if Page already in memory
{
ds[i].fixedcnt++;
check = 1;
hit++;
if(bm->strategy == RS_LRU)
ds[i].hitnum = hit;
else if(bm->strategy == RS_CLOCK) //if bm-> strategy is RS_CLOCK storing the USED bit in hitnum.
ds[i].hitnum = 1;
else if(bm->strategy == RS_LFU)
{
ds[i].numRef++;
//printf("Page %d referenced again \n", pageNum);
//rear = rear + 2;
//printf(" rear : %d \n", rear);
}
page->pageNum = pageNum;
page->data = ds[i].data;
clockptr++;
break;
}
}
else //Condition when the buffer has space to add a page
{
SM_FileHandle fh;
openPageFile (bm->pageFile, &fh);
ds[i].data = (SM_PageHandle) malloc(PAGE_SIZE);
readBlock(pageNum, &fh, ds[i].data);
ds[i].pagenum = pageNum;
ds[i].fixedcnt = 1;
ds[i].numRef = 0;
rear++;
hit++;
if(bm->strategy == RS_LRU)
ds[i].hitnum = hit;
else if(bm->strategy == RS_CLOCK) //if bm-> strategy is RS_CLOCK storing the USED bit in hitnum.
ds[i].hitnum = 1;
page->pageNum = pageNum;
page->data = ds[i].data;
check = 1;
break;
}
}//end of for
if(check == 0)//Condition when the buffer is full and we need to use a replacement strategy.
{
Data_Structure *temp = (Data_Structure *)malloc(sizeof(Data_Structure));
SM_FileHandle fh;
openPageFile (bm->pageFile, &fh);
temp->data = (SM_PageHandle) malloc(PAGE_SIZE);
readBlock(pageNum, &fh, temp->data);
temp->pagenum = pageNum;
temp->dirtybit = 0;
temp->fixedcnt = 1;
temp->numRef = 0;
rear++;
hit++;
//printf("HIT : %d \n", hit); //test by Rakesh
if(bm->strategy == RS_LRU )
temp->hitnum = hit;
else if(bm->strategy == RS_CLOCK) //if bm-> strategy is RS_CLOCK storing the USED bit in hitnum.
temp->hitnum = 1;
page->pageNum = pageNum;
page->data = temp->data;
switch(bm->strategy)
{
case RS_FIFO: //printf("\n Inside FIFO switch.");
fifo(bm,temp);
break;
case RS_LRU: //printf("\n Inside LRU switch.");
lru(bm,temp);
break;
case RS_CLOCK: //printf("\n Inside CLOCK switch");
clock(bm,temp);
break;
case RS_LFU: //printf("\n Inside LFU switch");
LFU(bm,temp);
break;
case RS_LRU_K: printf("\n Inside LRU_K switch");
break;
default:
printf("\nAlgorithm Not Implemented\n");
break;
}//end of switch
}//end of if(check = 0)
/*
printf("\nPinPage function buffer");
for(i=0;i<bufferSize;i++)
printf("\nPagenum: %d fixedcnt: %d dirty: %d",ds[i].pagenum,ds[i].fixedcnt,ds[i].dirtybit);
*/
return RC_OK;
}//end of else
}
void testReadWrite(void) {
SM_FileHandle fh;
SM_PageHandle ph;
int i;
ph = (SM_PageHandle) malloc(PAGE_SIZE);
testName = "test read and write methods";
TEST_CHECK(createPageFile (TESTPF));
TEST_CHECK(openPageFile (TESTPF, &fh));
ASSERT_TRUE(strcmp(fh.fileName, TESTPF) == 0, "filename correct");
ASSERT_TRUE((fh.totalNumPages == 1), "expect 1 page in new file");
ASSERT_TRUE((fh.curPagePos == 0), "freshly opened file's page position should be 0");
//Writes A, B, C, D, E, F, G, H from 0th page to 7th page
for(i = 0; i < 8; i ++) {
memset(ph, 'A' + i, PAGE_SIZE);
TEST_CHECK(writeBlock (i, &fh, ph));
printf("writing %d th block\n", fh.curPagePos);
}
// read first page into handle i.e. A
TEST_CHECK(readFirstBlock (&fh, ph));
for (i=0; i < PAGE_SIZE; i++)
ASSERT_TRUE((ph[i] == 'A'), "expected A");
printf("first block contains A\n");
// read last page into handle i.e. H
TEST_CHECK(readLastBlock (&fh, ph));
for (i=0; i < PAGE_SIZE; i++)
ASSERT_TRUE((ph[i] == 'H'), "expected H");
printf("last block contains H\n");
// read first page into handle i.e. A
readFirstBlock (&fh, ph);
// read next page into handle i.e. B
TEST_CHECK(readNextBlock (&fh, ph));
for (i=0; i < PAGE_SIZE; i++)
ASSERT_TRUE((ph[i] == 'B'), "expected B");
printf("block contains B\n");
readNextBlock (&fh, ph); //C
readNextBlock (&fh, ph); //D
// read previous page into handle i.e. C
TEST_CHECK(readPreviousBlock (&fh, ph));
for (i=0; i < PAGE_SIZE; i++)
ASSERT_TRUE((ph[i] == 'C'), "expected C");
printf("block contains C\n");
readNextBlock (&fh, ph); //D
readNextBlock (&fh, ph); //E
// read current page into handle i.e. E
TEST_CHECK(readCurrentBlock (&fh, ph));
for (i=0; i < PAGE_SIZE; i++)
ASSERT_TRUE((ph[i] == 'E'), "expected E");
printf("block contains E\n");
readPreviousBlock (&fh, ph); //D
//Replace D with Z
memset(ph, 'Z', PAGE_SIZE);
TEST_CHECK(writeCurrentBlock (&fh, ph));
printf("writing D with Z\n");
// read current page into handle i.e. Z
TEST_CHECK(readCurrentBlock (&fh, ph));
for (i=0; i < PAGE_SIZE; i++){
ASSERT_TRUE((ph[i] == 'Z'), "expected Z");
}
printf("block contains Z\n");
TEST_CHECK(closePageFile (&fh));
TEST_CHECK(destroyPageFile (TESTPF));
free(ph);
TEST_DONE();
}
void testAppendEnsureCapMetaData()
{
SM_FileHandle fh;
SM_PageHandle ph;
ph = (SM_PageHandle) malloc(PAGE_SIZE);
TEST_CHECK(createPageFile (TESTPF));
TEST_CHECK(openPageFile (TESTPF, &fh));
//Append an empty block to the file.
appendEmptyBlock(&fh);
//Check whether the appended block has only 4096 '\0' in the currentBlock.
readBlock(getBlockPos(&fh),&fh,ph);
int i;
for (i=0; i < PAGE_SIZE; i++)
ASSERT_TRUE((ph[i] == 0), "expected zero byte in first page of freshly initialized page");
printf("Appended Block was empty\n");
//Page File should contain only 2 blocks.first block during createPage and second during appendBlock
ASSERT_TRUE((fh.totalNumPages == 2), "Number of Blocks : 2");
//Current Block postion should be 1
ASSERT_TRUE((fh.curPagePos == 1), "Current Page Position is 1");
//add 3 more blocks to the Page File.
ensureCapacity(5,&fh);
//Verify whether the freshly added 3 blocks are of '\0' characters
//[START]
readBlock(2,&fh,ph);
for (i=0; i < PAGE_SIZE; i++)
ASSERT_TRUE((ph[i] == 0), "expected zero byte in first page of freshly initialized page");
readBlock(3,&fh,ph);
for (i=0; i < PAGE_SIZE; i++)
ASSERT_TRUE((ph[i] == 0), "expected zero byte in first page of freshly initialized page");
readBlock(4,&fh,ph);
for (i=0; i < PAGE_SIZE; i++)
ASSERT_TRUE((ph[i] == 0), "expected zero byte in first page of freshly initialized page");
printf("Freshly appended 3 blocks are empty\n");
//[END]
//Page File should contain only 5 blocks, as we have called ensureCapacity(5)
ASSERT_TRUE((fh.totalNumPages == 5), "Number of Blocks : 5");
//Current Block postion should be 4
ASSERT_TRUE((fh.curPagePos == 4), "Current Page Position is 4");
//Store the metaData into the file and close the pagefile.
int totalNoOfPages = fh.totalNumPages;
char fileName[100];
memset(fileName,'\0',100);
strcpy(fileName,fh.fileName);
char metaDataFromFile[100];
memset(metaDataFromFile,'\0',100);
closePageFile(&fh);
//Verify whether the written MetaData is correct or not
//[START]
char metaDataToBeVerified[100];
memset(metaDataToBeVerified,'\0',100);
char returnData[100];
memset(returnData,'\0',100);
metaDataToBeVerified[0]= 'P';metaDataToBeVerified[1]= 'S';metaDataToBeVerified[2]= ':';metaDataToBeVerified[3]= '\0';
getString(PAGE_SIZE,returnData);
strcat(metaDataToBeVerified,returnData);
strcat(metaDataToBeVerified,";");
memset(returnData,'\0',100);
strcat(metaDataToBeVerified,"NP:");
getString(totalNoOfPages,returnData);
strcat(metaDataToBeVerified,returnData);
strcat(metaDataToBeVerified,";");
readMetaDataFromFile(fileName,metaDataFromFile);
ASSERT_TRUE((strcmp(metaDataToBeVerified, metaDataFromFile) == 0), "MetaData read from file is correct");
printf("Read Meta Data from file is :: %s\n",metaDataToBeVerified);
//[END]
TEST_CHECK(destroyPageFile(TESTPF));
free(ph);
TEST_DONE();
}
RC initBufferPool(BM_BufferPool *const bm, const char *const pageFileName,
const int numPages, ReplacementStrategy strategy,
void *stratData) {
if(pageFileName == NULL)
return RC_FILE_NAME_NOT_PROVIDED;
if(numPages <= 0)
return RC_WRONG_NUMBER_OF_FRAMES;
int i;
// Update bufferpool variables.
bm->pageFile = (char *) malloc(strlen(pageFileName) + 1);
strcpy(bm->pageFile, pageFileName);
bm->numPages = numPages;
bm->strategy = strategy;
// Initialize mgmt data
bm->mgmtData = (BM_MgmtData *) malloc(sizeof(BM_MgmtData));
bm->mgmtData->readIO = 0;
bm->mgmtData->writeIO = 0;
bm->mgmtData->emptyFrames = numPages;
// Define head node for the page replacement linked list.
// bm->mgmtData->head = (BM_PageReplaceList *) malloc(sizeof(BM_PageReplaceList));
bm->mgmtData->head = NULL;
// bm->mgmtData->last = (BM_PageReplaceList *) malloc(sizeof(BM_PageReplaceList));
bm->mgmtData->last = NULL;
// bm->mgmtData->last = NULL;
// bm->mgmtData->refPointer = (BM_PageReplaceList *) malloc(sizeof(BM_PageReplaceList));
bm->mgmtData->refPointer = NULL;
// Initialize hash table details.
bm->mgmtData->hashT = (BM_HashTable *) malloc (sizeof(BM_HashTable));
// bm->mgmtData->hashT->hashArray = (PageInfo **) malloc (sizeof(PageInfo *));
for(i=0; i < numPages; i++) {
// Initialize pageInfo in the frame.
bm->mgmtData->hashT->hashArray[i] = (PageInfo *) malloc (sizeof(PageInfo));
bm->mgmtData->hashT->hashArray[i]->pageHandle = (BM_PageHandle *) malloc (sizeof(BM_PageHandle));
bm->mgmtData->hashT->hashArray[i]->pageHandle->data = (char *) malloc (PAGE_SIZE);
strcpy(bm->mgmtData->hashT->hashArray[i]->pageHandle->data, "\0");
}
for(i=0; i < numPages; i++) {
bm->mgmtData->hashT->hashArray[i]->fixCount = 0;
bm->mgmtData->hashT->hashArray[i]->dirtyFlag = false;
// Initialize pageHandle in the frame.
// bm->mgmtData->hashT->hashArray[i]->pageHandle = (BM_PageHandle *) malloc (sizeof(BM_PageHandle));
bm->mgmtData->hashT->hashArray[i]->pageHandle->pageNum = NO_PAGE;
// Allocate memory for data in the page frame.
// bm->mgmtData->hashT->hashArray[i]->pageHandle->data = (char *) malloc (PAGE_SIZE);
}
bm->mgmtData->hashT->arraySize = numPages;
// Initialize file handle for the buffer pool.
bm->mgmtData->fh = (SM_FileHandle *) malloc (sizeof(SM_FileHandle));
openPageFile (bm->pageFile, bm->mgmtData->fh);
return RC_OK;
}
