void
DOMStorageDBThread::PendingOperations::Add(DOMStorageDBThread::DBOperation* aOperation)
{
// Optimize: when a key to remove has never been written to disk
// just bypass this operation. A kew is new when an operation scheduled
// to write it to the database is of type opAddItem.
if (CheckForCoalesceOpportunity(aOperation, DBOperation::opAddItem, DBOperation::opRemoveItem)) {
mUpdates.Remove(aOperation->Target());
delete aOperation;
return;
}
// Optimize: when changing a key that is new and has never been
// written to disk, keep type of the operation to store it at opAddItem.
// This allows optimization to just forget adding a new key when
// it is removed from the storage before flush.
if (CheckForCoalesceOpportunity(aOperation, DBOperation::opAddItem, DBOperation::opUpdateItem)) {
aOperation->mType = DBOperation::opAddItem;
}
// Optimize: to prevent lose of remove operation on a key when doing
// remove/set/remove on a previously existing key we have to change
// opAddItem to opUpdateItem on the new operation when there is opRemoveItem
// pending for the key.
if (CheckForCoalesceOpportunity(aOperation, DBOperation::opRemoveItem, DBOperation::opAddItem)) {
aOperation->mType = DBOperation::opUpdateItem;
}
switch (aOperation->Type())
{
// Operations on single keys
case DBOperation::opAddItem:
case DBOperation::opUpdateItem:
case DBOperation::opRemoveItem:
// Override any existing operation for the target (=scope+key).
mUpdates.Put(aOperation->Target(), aOperation);
break;
// Clear operations
case DBOperation::opClear:
case DBOperation::opClearMatchingScope:
// Drop all update (insert/remove) operations for equivavelent or matching scope.
// We do this as an optimization as well as a must based on the logic,
// if we would not delete the update tasks, changes would have been stored
// to the database after clear operations have been executed.
mUpdates.Enumerate(ForgetUpdatesForScope, aOperation);
mClears.Put(aOperation->Target(), aOperation);
break;
case DBOperation::opClearAll:
// Drop simply everything, this is a super-operation.
mUpdates.Clear();
mClears.Clear();
mClears.Put(aOperation->Target(), aOperation);
break;
default:
MOZ_ASSERT(false);
break;
}
}
void
StorageDBThread::PendingOperations::Add(StorageDBThread::DBOperation* aOperation)
{
// Optimize: when a key to remove has never been written to disk
// just bypass this operation. A key is new when an operation scheduled
// to write it to the database is of type opAddItem.
if (CheckForCoalesceOpportunity(aOperation, DBOperation::opAddItem,
DBOperation::opRemoveItem)) {
mUpdates.Remove(aOperation->Target());
delete aOperation;
return;
}
// Optimize: when changing a key that is new and has never been
// written to disk, keep type of the operation to store it at opAddItem.
// This allows optimization to just forget adding a new key when
// it is removed from the storage before flush.
if (CheckForCoalesceOpportunity(aOperation, DBOperation::opAddItem,
DBOperation::opUpdateItem)) {
aOperation->mType = DBOperation::opAddItem;
}
// Optimize: to prevent lose of remove operation on a key when doing
// remove/set/remove on a previously existing key we have to change
// opAddItem to opUpdateItem on the new operation when there is opRemoveItem
// pending for the key.
if (CheckForCoalesceOpportunity(aOperation, DBOperation::opRemoveItem,
DBOperation::opAddItem)) {
aOperation->mType = DBOperation::opUpdateItem;
}
switch (aOperation->Type())
{
// Operations on single keys
case DBOperation::opAddItem:
case DBOperation::opUpdateItem:
case DBOperation::opRemoveItem:
// Override any existing operation for the target (=scope+key).
mUpdates.Put(aOperation->Target(), aOperation);
break;
// Clear operations
case DBOperation::opClear:
case DBOperation::opClearMatchingOrigin:
case DBOperation::opClearMatchingOriginAttributes:
// Drop all update (insert/remove) operations for equivavelent or matching
// scope. We do this as an optimization as well as a must based on the
// logic, if we would not delete the update tasks, changes would have been
// stored to the database after clear operations have been executed.
for (auto iter = mUpdates.Iter(); !iter.Done(); iter.Next()) {
nsAutoPtr<DBOperation>& pendingTask = iter.Data();
if (aOperation->Type() == DBOperation::opClear &&
(pendingTask->OriginNoSuffix() != aOperation->OriginNoSuffix() ||
pendingTask->OriginSuffix() != aOperation->OriginSuffix())) {
continue;
}
if (aOperation->Type() == DBOperation::opClearMatchingOrigin &&
!StringBeginsWith(pendingTask->OriginNoSuffix(), aOperation->Origin())) {
continue;
}
if (aOperation->Type() == DBOperation::opClearMatchingOriginAttributes &&
!OriginPatternMatches(pendingTask->OriginSuffix(), aOperation->OriginPattern())) {
continue;
}
iter.Remove();
}
mClears.Put(aOperation->Target(), aOperation);
break;
case DBOperation::opClearAll:
// Drop simply everything, this is a super-operation.
mUpdates.Clear();
mClears.Clear();
mClears.Put(aOperation->Target(), aOperation);
break;
default:
MOZ_ASSERT(false);
break;
}
}
