/// <summary>
/// When maximum capacity of Collection's Objects' MRU Manager is reached,
/// it calls this version of "OnMaxCapacity" in order to
/// reduce the number of objects kept in-memory
/// </summary>
/// <param name="nodes">List of Collection Objects or "Nodes" that were removed
/// from memory and should be saved to disk</param>
public virtual int OnMaxCapacity(IEnumerable nodes)
{
foreach (IInternalPersistent node in nodes)
{
if (!node.IsDirty)
{
continue;
}
//** save Items' Data
var block = WriteToBlock(node);
DataBlockDriver.SetDiskBlock(this, block, false);
AddToBlocks(block, Blocks);
node.IsDirty = false;
}
int r = Blocks.Count;
SaveBlocks(false);
return(r);
}
/// <summary>
/// Register current collection's state
/// </summary>
public virtual void RegisterChange(bool partialRegister = false)
{
IsDirty = true;
_registerCallCount++;
if (_registerCallCount == 1)
{
if (DiskBuffer == null)
{
throw new InvalidOperationException("'DiskBuffer' is null.");
}
bool stateSerialized = false;
if (!partialRegister || DiskBuffer.SizeOccupied == 0)
{
stateSerialized = true;
DiskBuffer.ClearData();
OnDiskBinaryWriter.WriteObject(File, this, DiskBuffer);
}
if (!ChangeRegistry)
{
_registerCallCount = 0;
if (!partialRegister || stateSerialized)
{
Blocks.Add(DataBlockDriver.GetId(DiskBuffer), DiskBuffer); //90;
}
//DataBlockDriver.MruManager.Add(DataBlockDriver.GetId(DiskBuffer), DiskBuffer);
}
else
{
DataBlockDriver.SetDiskBlock(this, DiskBuffer, true);
if (_registerCallCount > 1)
{
_registerCallCount = 0;
//IsDirty = true;
RegisterChange(partialRegister);
}
_registerCallCount = 0;
}
}
}
//internal override bool RemoveInMemory(long DataAddress, Transaction.ITransactionLogger Transaction)
//{
// if (LastItem != null)
// LastItem.Clear();
// if (FirstItem != null)
// FirstItem.Clear();
// CurrentItem = null;
// base.RemoveInMemory(DataAddress, Transaction);
// return true;
//}
private void RemoveAt(long dataAddress, bool willMove)
{
if (willMove && !MoveTo(dataAddress))
{
return;
}
if (IsDeletedBlocksList && Count == 1)
{
return;
}
Sop.DataBlock currBlock = this.GetCurrentDataBlock(true);
if (FirstItem.DiskBuffer.DataAddress == dataAddress)
{
MoveFirst();
if (MoveNext())
{
FirstItem.DiskBuffer.DataAddress = CurrentItem.DiskBuffer.DataAddress;
CurrentItem.PreviousItemAddress = -1;
Sop.DataBlock db = WriteToBlock(CurrentItem, CurrentItem.DiskBuffer);
DataBlockDriver.SetDiskBlock(this, db, false);
}
else
{
long address = FirstItem.DiskBuffer.DataAddress;
FirstItem.DiskBuffer.DataAddress = LastItem.DiskBuffer.DataAddress = -1;
CurrentItem = FirstItem;
Sop.DataBlock db = WriteToBlock(CurrentItem, CurrentItem.DiskBuffer);
db.DataAddress = address;
DataBlockDriver.SetDiskBlock(this, db, false);
db.DataAddress = -1;
}
}
else if (LastItem.DiskBuffer.DataAddress == dataAddress)
{
if (MovePrevious() || FirstItem.DiskBuffer.DataAddress == CurrentItem.DiskBuffer.DataAddress)
{
LastItem.DiskBuffer.DataAddress = CurrentItem.DiskBuffer.DataAddress;
CurrentItem.NextItemAddress = -1;
Sop.DataBlock db = WriteToBlock(CurrentItem, CurrentItem.DiskBuffer);
DataBlockDriver.SetDiskBlock(this, db, false);
}
else
{
throw new InvalidOperationException("Can't go previous but First is not the only item.");
}
}
else
{
LinkedItemOnDisk curr = CurrentItem;
LinkedItemOnDisk prev = null, next = null;
if (MoveTo(curr.PreviousItemAddress))
{
prev = CurrentItem;
}
if (MoveTo(curr.NextItemAddress))
{
next = CurrentItem;
}
if (prev != null && next != null)
{
prev.NextItemAddress = curr.NextItemAddress;
next.PreviousItemAddress = curr.PreviousItemAddress;
Sop.DataBlock db = WriteToBlock(prev, prev.DiskBuffer);
DataBlockDriver.SetDiskBlock(this, db, false);
db = WriteToBlock(next, next.DiskBuffer);
DataBlockDriver.SetDiskBlock(this, db, false);
}
}
if (MruManager.Count > 0)
{
MruManager.Remove(dataAddress, true);
}
DataBlockDriver.Remove(this, currBlock);
}
/// <summary>
/// Serialize object and write its byte array to disk
/// </summary>
/// <param name="value"></param>
/// <param name="isCollectionBlock"> </param>
protected void WriteToDisk(IInternalPersistent value, bool isCollectionBlock)
{
Sop.DataBlock block = WriteToBlock(value, value.DiskBuffer);
DataBlockDriver.SetDiskBlock(this, block, isCollectionBlock);
}