void BufferManager::save(){
for (int i = 0; i < NUMOFBUFFER; i++) {
if (blocks[i].getInTableBit() && blocks[i].getDirtyBit()) {
bufferToFile(i);
}
}
}
//private
int BufferManager::ReplaceBlockIndex(){
static int tempIndex = 0;
while (1) {
if(tempIndex == NUMOFBUFFER){
tempIndex -= NUMOFBUFFER;
}
if (!blocks[tempIndex].getPinBit()) {
if (blocks[tempIndex].getReferenceBit()) {
blocks[tempIndex].setReferenceBit(0);
}
else{
if (blocks[tempIndex].getDirtyBit()) {
if(bufferToFile(tempIndex)){
goto CONTINUELOOP;
}
}
//erase the hash key
if (blocks[tempIndex].getInTableBit()) {
IndexTable.erase(hashKey(blocks[tempIndex].getFileName(), blocks[tempIndex].getPartOfFile()));
blocks[tempIndex].setInTableBit(0);
}
return tempIndex++;
}
}
CONTINUELOOP:
tempIndex++;
}
}
void testCase(){
char buf[100];
char uid[100];
strcpy(buf,"12345678911234561234567890123456");
strcat(buf,"21345678911234561234567890123456");
strcpy(uid,"abc");
bufferToFile(buf,strlen(buf),uid,1);
}
int BufferManager::bufferToFile(string fileName, int part){
if (IndexTable.find(hashKey(fileName, part)) == IndexTable.end()) {
fprintf(stderr, "buffer not exists, in BufferManager::bufferToFile.\n");
return -1;
}
int index = IndexTable[hashKey(fileName, part)];
return bufferToFile(index);
}
