bool CopyOnWriteContext::notifyTupleDelete(TableTuple &tuple) {
assert(m_iterator != NULL);
if (tuple.isDirty() || m_finishedTableScan) {
return true;
}
/**
* Find out which block the address is contained in. Lower bound returns the first entry
* in the index >= the address. Unless the address happens to be equal then the block
* we are looking for is probably the previous entry. Then check if the address fits
* in the previous entry. If it doesn't then the block is something new.
*/
TBPtr block = PersistentTable::findBlock(tuple.address(), m_blocks, getTable().getTableAllocationSize());
if (block.get() == NULL) {
// tuple not in snapshot region, don't care about this tuple
return true;
}
/**
* Now check where this is relative to the COWIterator.
*/
CopyOnWriteIterator *iter = reinterpret_cast<CopyOnWriteIterator*>(m_iterator.get());
return !iter->needToDirtyTuple(block->address(), tuple.address());
}
void CopyOnWriteContext::markTupleDirty(TableTuple tuple, bool newTuple) {
assert(m_iterator != NULL);
if (newTuple) {
m_inserts++;
}
else {
m_updates++;
}
/**
* If this an update or a delete of a tuple that is already dirty then no further action is
* required.
*/
if (!newTuple && tuple.isDirty()) {
return;
}
/**
* If the table has been scanned already there is no need to continue marking tuples dirty
* If the tuple is dirty then it has already been backed up.
*/
if (m_finishedTableScan) {
tuple.setDirtyFalse();
return;
}
/**
* Find out which block the address is contained in.
*/
TBPtr block = PersistentTable::findBlock(tuple.address(), m_blocks, getTable().getTableAllocationSize());
if (block.get() == NULL) {
// tuple not in snapshot region, don't care about this tuple, no need to dirty it
tuple.setDirtyFalse();
return;
}
/**
* Now check where this is relative to the COWIterator.
*/
CopyOnWriteIterator *iter = reinterpret_cast<CopyOnWriteIterator*>(m_iterator.get());
if (iter->needToDirtyTuple(block->address(), tuple.address())) {
tuple.setDirtyTrue();
/**
* Don't back up a newly introduced tuple, just mark it as dirty.
*/
if (!newTuple) {
m_backedUpTuples->insertTupleNonVirtualWithDeepCopy(tuple, &m_pool);
}
} else {
tuple.setDirtyFalse();
return;
}
}
void CopyOnWriteContext::notifyBlockWasCompactedAway(TBPtr block) {
assert(m_iterator != NULL);
if (m_finishedTableScan) {
// There was a compaction while we are iterating through the m_backedUpTuples
// TempTable. Don't do anything because the passed in block is a PersistentTable
// block
return;
}
m_blocksCompacted++;
CopyOnWriteIterator *iter = static_cast<CopyOnWriteIterator*>(m_iterator.get());
TBPtr nextBlock = iter->m_blockIterator.data();
TBPtr newNextBlock = iter->m_blockIterator.data();
iter->notifyBlockWasCompactedAway(block);
}
bool CopyOnWriteContext::notifyTupleDelete(TableTuple &tuple) {
assert(m_iterator != NULL);
if (tuple.isDirty() || m_finishedTableScan) {
return true;
}
// This is a 'loose' count of the number of deletes because COWIterator could be past this
// point in the block.
m_deletes++;
/**
* Now check where this is relative to the COWIterator.
*/
CopyOnWriteIterator *iter = reinterpret_cast<CopyOnWriteIterator*>(m_iterator.get());
return !iter->needToDirtyTuple(tuple.address());
}
void CopyOnWriteContext::markTupleDirty(TableTuple tuple, bool newTuple) {
assert(m_iterator != NULL);
/**
* If this an update or a delete of a tuple that is already dirty then no further action is
* required.
*/
if (!newTuple && tuple.isDirty()) {
return;
}
/**
* If the table has been scanned already there is no need to continue marking tuples dirty
* If the tuple is dirty then it has already been backed up.
*/
if (m_finishedTableScan) {
tuple.setDirtyFalse();
return;
}
/**
* Now check where this is relative to the COWIterator.
*/
CopyOnWriteIterator *iter = reinterpret_cast<CopyOnWriteIterator*>(m_iterator.get());
if (iter->needToDirtyTuple(tuple.address())) {
tuple.setDirtyTrue();
if (newTuple) {
/**
* Don't back up a newly introduced tuple, just mark it as dirty.
*/
m_inserts++;
}
else {
m_updates++;
m_backedUpTuples->insertTempTupleDeepCopy(tuple, &m_pool);
}
} else {
tuple.setDirtyFalse();
return;
}
}
bool CopyOnWriteContext::canSafelyFreeTuple(TableTuple tuple) {
assert(m_iterator != NULL);
if (tuple.isDirty() || m_finishedTableScan) {
return true;
}
/**
* Find out which block the address is contained in. Lower bound returns the first entry
* in the index >= the address. Unless the address happens to be equal then the block
* we are looking for is probably the previous entry. Then check if the address fits
* in the previous entry. If it doesn't then the block is something new.
*/
char *address = tuple.address();
TBMapI i = m_blocks.lower_bound(address);
if (i == m_blocks.end() && m_blocks.empty()) {
return true;
}
if (i == m_blocks.end()) {
i--;
if (i.key() + getTable().m_tableAllocationSize < address) {
return true;
}
//OK it is in the very last block
} else {
if (i.key() != address) {
i--;
if (i.key() + getTable().m_tableAllocationSize < address) {
return true;
}
//OK... this is in this particular block
}
}
const char *blockStartAddress = i.key();
/**
* Now check where this is relative to the COWIterator.
*/
CopyOnWriteIterator *iter = reinterpret_cast<CopyOnWriteIterator*>(m_iterator.get());
return !iter->needToDirtyTuple(blockStartAddress, address);
}
void CopyOnWriteContext::markTupleDirty(TableTuple tuple, bool newTuple) {
if (newTuple) {
m_inserts++;
}
else {
m_updates++;
}
/**
* If this an update or a delete of a tuple that is already dirty then no further action is
* required.
*/
if (!newTuple && tuple.isDirty()) {
return;
}
/**
* If the table has been scanned already there is no need to continue marking tuples dirty
* If the tuple is dirty then it has already been backed up.
*/
if (m_finishedTableScan) {
tuple.setDirtyFalse();
return;
}
/**
* Find out which block the address is contained in.
*/
char *address = tuple.address();
TBMapI i =
m_blocks.lower_bound(address);
if (i == m_blocks.end() && m_blocks.empty()) {
tuple.setDirtyFalse();
return;
}
if (i == m_blocks.end()) {
i--;
if (i.key() + m_table.m_tableAllocationSize < address) {
tuple.setDirtyFalse();
return;
}
//OK it is in the very last block
} else {
if (i.key() != address) {
i--;
if (i.key() + m_table.m_tableAllocationSize < address) {
tuple.setDirtyFalse();
return;
}
//OK... this is in this particular block
}
}
const char *blockStartAddress = i.key();
/**
* Now check where this is relative to the COWIterator.
*/
CopyOnWriteIterator *iter = reinterpret_cast<CopyOnWriteIterator*>(m_iterator.get());
if (iter->needToDirtyTuple(blockStartAddress, address)) {
tuple.setDirtyTrue();
/**
* Don't back up a newly introduced tuple, just mark it as dirty.
*/
if (!newTuple) {
m_backedUpTuples->insertTupleNonVirtualWithDeepCopy(tuple, &m_pool);
}
} else {
tuple.setDirtyFalse();
return;
}
}
void CopyOnWriteContext::markTupleDirty(TableTuple tuple, bool newTuple) {
/**
* If this an update or a delete of a tuple that is already dirty then no further action is
* required.
*/
if (!newTuple && tuple.isDirty()) {
return;
}
/**
* If the table has been scanned already there is no need to continue marking tuples dirty
* If the tuple is dirty then it has already been backed up.
*/
if (m_finishedTableScan) {
tuple.setDirtyFalse();
return;
}
/**
* Find out which block the address is contained in.
*/
char *address = tuple.address();
#ifdef MEMCHECK
BlockPair compP;
compP.pair = std::pair<char*, int>(address, 0);
compP.tupleLength = tuple.tupleLength();
#else
const BlockPair compP(address, 0);
#endif
BlockPairVectorI i =
std::lower_bound(m_blocks.begin(), m_blocks.end(), compP, pairAddressToPairAddressComparator);
if (i == m_blocks.end()) {
tuple.setDirtyFalse();
return;
}
#ifdef MEMCHECK
const char *blockStartAddress = (*i).pair.first;
const int blockIndex = (*i).pair.second;
const char *blockEndAddress = blockStartAddress + tuple.tupleLength();
#else
const char *blockStartAddress = (*i).first;
const int blockIndex = (*i).second;
const char *blockEndAddress = blockStartAddress + TABLE_BLOCKSIZE;
#endif
if (address >= blockEndAddress || address < blockStartAddress) {
/**
* Tuple is in a block allocated after the start of COW
*/
tuple.setDirtyFalse();
return;
}
/**
* Now check where this is relative to the COWIterator.
*/
CopyOnWriteIterator *iter = reinterpret_cast<CopyOnWriteIterator*>(m_iterator.get());
if (iter->needToDirtyTuple(blockIndex, address, newTuple)) {
tuple.setDirtyTrue();
/**
* Don't back up a newly introduced tuple, just mark it as dirty.
*/
if (!newTuple) {
m_backedUpTuples->insertTupleNonVirtualWithDeepCopy(tuple, &m_pool);
}
} else {
tuple.setDirtyFalse();
return;
}
}
