int DirPage::insertRecords(RecordSet* rs, int s){
//return number of records inserted.
int start = 0;
long dpNum;//DataPage Num.
int recLen;
DataPage* dp;
int sid,i = 0;
int n = rs->getNumOfRecords();
vector<Record*> rec = rs->getAllRecords();
int *attrType = rs->getAttrType();
char *recStr;
for(i=s;i<n;i++){
recLen = rec[i]->getSize();
dpNum = findNextPartialPage(start,recLen);//find the first partial page
if(dpNum == -1){
//no sufficient page.
//try to create new DP and add it,vector<DirEntry*> dirEntries to DE.
if(DEcount < MAX_DE ){
//create new DataPage.
dp = createDataPage();
start = DEcount - 1;
}else{
//further insertion not possible
error("@DirPage Insertion : DirPage Full.");
//return the number of records inserted.
writeToPage();
return i - s;
}
}else{
dp = new DataPage(dirEntries[dpNum]->getPageID());
start = dpNum;
}
recStr = rec[i]->toRecordString(attrType);
sid = dp->insertRecord(recStr,rec[i]->getSize());
delete[] recStr;
if(sid!=-1){
//successful insertion
//update dirPage entries.
lg("@DirPage Insertion: Record "<<i<<" - inserted in DataPage "<<dp->getPageid());
dirEntries[start]->setTFS(dp->getTotalFreeSize());
dirEntries[start]->writeDE(p,start);
start = 0;//check from first again for next record.
updateMaximumSpaceParam();
}else{
error("@DirPage Insertion : DataPage "<<dp->getPageid()<<" is full. Retrying next Page in DE");
//insertion error
//retry the insertion here again to select a diff DP.
i--;//so the same record will be referenced again
start++;//search from next page!
}
if(dp!=NULL) delete dp;
}
writeToPage();
return i - s;
}
int DirPage::deleteRecords(Where *where, int* attrType, int numOfAttr){
if(DEcount == 0){
lg2("@DirPage_"<<pageid<<" : No Records to delete.");
return 0;
}
DataPage* datapage;
long noOfRecs = 0;
long dataPid;
long maxTFS;
DirEntry *de;
// dirEntries;
for(vector<DirEntry*>::size_type i = 0;
i<dirEntries.size() ; i++){
//create DataPage for every entry and try retreiving records.
de = dirEntries[i];
dataPid = de->getPageID();
datapage = new DataPage(dataPid);
noOfRecs += datapage->deleteRecords(where,attrType,numOfAttr);
maxTFS = datapage->getTotalFreeSize();
de->setTFS(maxTFS);
if(maxSpaceAvailable < maxTFS)
maxSpaceAvailable = maxTFS;
de->writeDE(p,i);
writeToPage();
delete datapage;
}
return noOfRecs;
}
DirPage::~DirPage() {
// TODO Auto-generated destructor stub
int n = dirEntries.size();
for(int i=0;i<n;i++){
delete dirEntries[i];
}
writeToPage();
//delete [] p;
}
DirPage::DirPage() {
nextPage = 0;
prevPage = 0;
maxSpaceAvailable = 0;
DEcount = 0;
memcpy(p,this,sizeof(DirPage));
writeToPage();
printDetails();
}
long DirPage::updateRecords(Where *where, Modify *modify, RecordSet* rs){
if(DEcount == 0){
lg2("@DirPage_"<<pageid<<" : No Records to update.");
return 0;
}
DataPage* datapage;
long noOfRecs = 0;
long dataPid;
long maxTFS;
DirEntry *de;
// dirEntries;
for(vector<DirEntry*>::size_type i = modify->getStartDirEntry();
i<dirEntries.size() ; i++){
//create DataPage for every entry and try retreiving records.
de = dirEntries[i];
dataPid = de->getPageID();
datapage = new DataPage(dataPid);
noOfRecs += datapage->updateRecords(where,modify,rs);
maxTFS = datapage->getTotalFreeSize();
de->setTFS(maxTFS);
if(maxSpaceAvailable < maxTFS)
maxSpaceAvailable = maxTFS;
de->writeDE(p,i);
if(modify->isThereMore()){
writeToPage();
modify->setStartDirEntry(i);
delete datapage;
return noOfRecs;
}
delete datapage;
}
writeToPage();
return noOfRecs;
}
bool Queue::write(AddressType& Address,
uint8_t* FromBuf,
AddressType WantedSize) {
PageCursor Cursor(this);
while (WantedSize) {
AddressType FoundSize = writeToPage(Address, WantedSize, Cursor);
if (FoundSize == 0)
return false;
uint8_t* ToBuf = Cursor.getBufferPtr();
memcpy(ToBuf, FromBuf, FoundSize);
Address += FoundSize;
WantedSize -= FoundSize;
}
return true;
}
DataPage* DirPage::createDataPage(){
//create a datapage.
//get tfs and store it in DE
if(DEcount == MAX_DE){
error("No Free space to insert DE");
return NULL;
}
DataPage *dp = new DataPage();
long pid = dp->getPageid();
long tfs = dp->getTotalFreeSize();
DirEntry *de = new DirEntry(pid,tfs);
dirEntries.push_back(de);
de->writeDE(p,DEcount);
DEcount++;
if(tfs>maxSpaceAvailable)
maxSpaceAvailable = tfs;
writeToPage();
return dp;
}
void Queue::freezeEof(AddressType& Address) {
assert(Address <= kMaxEofAddress && "WASM stream too big to process");
if (EofFrozen && Address != EofPtr->getEobAddress()) {
fail();
Address = 0;
}
// This call zero-fills pages if writing hasn't reached Address yet.
PageCursor Cursor(this);
writeToPage(Address, 0, Cursor);
EofPtr->setEobAddress(Address);
EofFrozen = true;
if (!isBroken(Cursor)) {
Cursor.setMaxAddress(Address);
// TODO(karlschimpf): If adding threads, make this update thread safe.
// If any pages exist after Cursor, remove them.
LastPage = Cursor.CurPage;
if (Cursor.CurPage->Next)
Cursor.CurPage->Next.reset();
}
}
