private int AllocateBlockId()
{
var freeBlock = FreeBlocks.Where(b => !InitialFreeBlocks.Contains(b)).FirstOrDefault();
if (freeBlock == 0)
{
freeBlock = FreeBlocks.FirstOrDefault();
}
if (freeBlock == 0)
{
freeBlock = TailBlockId++;
}
FreeBlocks.Remove(freeBlock);
AllocatedBlocks.Add(freeBlock);
return(freeBlock);
}
private void SaveChanges()
{
if (!IsChanged)
{
return;
}
MasterBlockData.FreeListBlockId = WriteFreeBlocks();
foreach (var kv in _blocks.Where(kv => AllocatedBlocks.Contains(kv.Key)))
{
WriteChainedBlock(kv.Value);
}
FlushStreamBuffers();
WriteMasterBlockData();
//Console.Out.WriteLine("Written: {0}, Free: {1}, Initial free: {2}, Allocated: {3}, Garbage: {4}",
// _blocks.Count, FreeBlocks.Count, InitialFreeBlocks.Count, AllocatedBlocks.Count,
// GarbageBlocks.Count);
}
public void FreeBlock(int blockId)
{
VerifyValidDataBlock(blockId);
IsChanged = true;
var chainedBlock = _blocks[blockId];
if (AllocatedBlocks.Contains(blockId) || InitialFreeBlocks.Contains(blockId))
{
foreach (var id in chainedBlock.BlockIds)
{
FreeBlocks.Add(id);
}
}
else
{
foreach (var id in chainedBlock.BlockIds)
{
GarbageBlocks.Add(id);
}
}
_blocks.Remove(blockId);
}