void BufferManager::deleteOneTuple(int size, long position)
{
cout << "----------------Deleting----------------" << endl;
if (getFreeSpaceInCurrentPage(position) > size)
{
char * temp = (char *)malloc(size * sizeof(char));
for (int i = 0; i < size; i++) temp[i] = '\0';
write(temp, getPageNumber(position), getPagePosition(position), size);
setFileHeader(getPageNumber(position), 0);
free(temp);
}
else
{
//More than one segment
//First segment
int firstSegmentSize = getFreeSpaceInCurrentPage(position);
char * temp = (char *)malloc(firstSegmentSize * sizeof(char));
for (int i = 0; i < firstSegmentSize; i++) temp[i] = '\0';
cout << "Delete segment. Start PageNumber: " << getPageNumber(position) << " PagePosition: " << getPagePosition(position) << " Size: " << firstSegmentSize << endl;
write(temp, getPageNumber(position), getPagePosition(position), firstSegmentSize);
setFileHeader(getPageNumber(position), 0);
size -= firstSegmentSize;
position += firstSegmentSize;
free(temp);
//Second to last second segments
temp = (char *)malloc(PAGE_SIZE * sizeof(char));
for (int i = 0; i < PAGE_SIZE; i++) temp[i] = '\0';
while (size > PAGE_SIZE)
{
write(temp, getPageNumber(position), getPagePosition(position), PAGE_SIZE);
cout << "Delete segment. Start PageNumber: " << getPageNumber(position) << " PagePosition: " << getPagePosition(position) << " Size: " << PAGE_SIZE << endl;
setFileHeader(getPageNumber(position), 0);
size -= PAGE_SIZE;
position += PAGE_SIZE;
}
free(temp);
//last segment
temp = (char *)malloc(size * sizeof(char));
for (int i = 0; i < size; i++) temp[i] = '\0';
write(temp, getPageNumber(position), getPagePosition(position), size);
cout << "Delete segment. Start PageNumber: " << getPageNumber(position) << " PagePosition: " << getPagePosition(position) << " Size: " << size << endl;
setFileHeader(getPageNumber(position), 0);
free(temp);
}
cout << "----------------Deleting----------------" << endl;
}
void EventRecorder::deinit() {
if (!_initialized) {
return;
}
setFileHeader();
_needRedraw = false;
_initialized = false;
_recordMode = kPassthrough;
delete _fakeMixerManager;
_fakeMixerManager = NULL;
_controlPanel->close();
delete _controlPanel;
debugC(1, kDebugLevelEventRec, "playback:action=stopplayback");
g_system->getEventManager()->getEventDispatcher()->unregisterSource(this);
_recordMode = kPassthrough;
_playbackFile->close();
delete _playbackFile;
switchMixer();
switchTimerManagers();
DebugMan.disableDebugChannel("EventRec");
}
long BufferManager::insertOneTuple(char * tuple, int size)
{
DBFileManager * dBFileManager = DBFileManager::getInstance();
cout << "----------------Finding free space----------------" << endl;
long insertPosition = findFreeSpace(size);
long returnPosition = insertPosition;
if (insertPosition == -1)
{
long fileLength = dBFileManager->length();
if (fileLength < MAX_PAGE_NUM * PAGE_SIZE)
{
insertPosition = fileLength;
}
else
{
cout << "Out of max size of DB File." << endl;
exit(0);
}
}
cout << "Find the enough free space from position:'" << insertPosition << "'." << endl;
cout << "----------------Finding free space----------------" << endl;
cout << "----------------Inserting----------------" << endl;
if (getFreeSpaceInCurrentPage(insertPosition) > size)
{
//Just one segment
cout << "Just one segment. PageNumber: " << getPageNumber(insertPosition) << " PagePosition: " << getPagePosition(insertPosition) << " Size: " << (getFreeSpaceInCurrentPage(insertPosition)) << "." << endl;
write(tuple, getPageNumber(insertPosition), getPagePosition(insertPosition), size);
if (isPageWritable(getPageNumber(insertPosition)) == false) setFileHeader(getPageNumber(insertPosition), 1);
}
else
{
//More than one segment
//First segment
cout << "More than one segment. " << endl;
cout<<"Insert first segment. Start PageNumber: " << getPageNumber(insertPosition) << " PagePosition: " << getPagePosition(insertPosition) << " Size: " << getFreeSpaceInCurrentPage(insertPosition) << "." << endl;
write(tuple, getPageNumber(insertPosition), getPagePosition(insertPosition), getFreeSpaceInCurrentPage(insertPosition));
if (isPageWritable(getPageNumber(insertPosition)) == false) setFileHeader(getPageNumber(insertPosition), 1);
size -= (PAGE_SIZE - getPagePosition(insertPosition));
tuple += (PAGE_SIZE - getPagePosition(insertPosition));
insertPosition += (PAGE_SIZE - getPagePosition(insertPosition));
//Second to last second segments
while (size > PAGE_SIZE)
{
cout << "Insert segment. Start PageNumber: " << getPageNumber(insertPosition) << " PagePosition: " << getPagePosition(insertPosition) << " Size: " << PAGE_SIZE << endl;
write(tuple, getPageNumber(insertPosition), getPagePosition(insertPosition), PAGE_SIZE);
setFileHeader(getPageNumber(insertPosition), 1);
size -= PAGE_SIZE;
tuple += PAGE_SIZE;
insertPosition += PAGE_SIZE;
}
//last segment
cout << "Insert segment. Start PageNumber: " << getPageNumber(insertPosition) << " PagePosition: " << getPagePosition(insertPosition) << " Size: " << size << endl;
write(tuple, getPageNumber(insertPosition), getPagePosition(insertPosition), size);
if (isPageWritable(getPageNumber(insertPosition)) == false) setFileHeader(getPageNumber(insertPosition), 1);
}
cout << "----------------Inserting----------------" << endl;
return returnPosition;
}
