//public Region RemoveIntersections(Collections.Generic.ISortedDictionary<Transaction.Transaction.RecordKey, long> addStore,
// Transaction.Transaction.RecordKey key, Region region)
//{
// Region target = new List<KeyValuePair<RecordKey, Region>>();
// foreach(var area in region)
// {
// }
//}
/// <summary>
/// RemoveIntersections will check whether an area on disk was already
/// inclusive in any of the segment areas stored as entries in a store (addStore).
/// If input area is fully inclusive, this function returns null, otherwise
/// it will return a region equivalent to the input area minus any intersecting
/// area(s) of segment(s) in the store.
/// </summary>
/// <param name="addStore"></param>
/// <param name="key"></param>
/// <param name="blockAddress"></param>
/// <param name="segmentSize"></param>
/// <returns></returns>
public Region RemoveIntersections(
Collections.Generic.ISortedDictionary <Transaction.Transaction.RecordKey, long> addStore,
Transaction.Transaction.RecordKey key,
long blockAddress, int segmentSize)
{
addStore.Locker.Lock();
try
{
long size;
if (addStore.TryGetValue(key, out size))
{
if (size >= segmentSize)
{
return(null);
}
}
else if (!addStore.MovePrevious())
{
addStore.MoveFirst();
}
//** Step 1
//** Starting from current block until block whose address is > BlockAddress + SegmentSize...
//** long[0] = Address
//** long[1] = Size
var region = new Region(blockAddress, segmentSize);
Transaction.Transaction.RecordKey k2;
short passCount = 0;
while (!addStore.EndOfTree())
{
var de = addStore.CurrentEntry;
k2 = de.Value.Key;
if (k2.ServerSystemFilename == key.ServerSystemFilename &&
k2.Filename == key.Filename)
// && k2.CollectionName == key.CollectionName)
{
size = de.Value.Value;
if (k2.Address >= blockAddress + segmentSize)
{
break;
}
if (size > int.MaxValue)
{
throw new InvalidOperationException(
string.Format(
"Updated segment Size({0} reached > int.MaxValue which isn't supported in a transaction. Keep your transaction smaller by Committing more often",
size));
}
if (Intersect(k2.Address, (int)size, blockAddress, segmentSize))
{
region.Subtract(k2.Address, (int)size);
if (region.Count == 0)
{
return(null);
}
}
else if (++passCount >= 2)
{
break;
}
}
else if (++passCount >= 2)
{
break;
}
if (!addStore.MoveNext())
{
break;
}
}
return(region);
}
finally
{
addStore.Locker.Unlock();
}
}
