public void CreateNewBlock(Guid id, ulong blockCount)
{
if (blockCount > UInt32.MaxValue)
{
throw new Exception("VirtualBlocks larger than 2^32-1 are not yet supported!");
}
using(_configurationLock.EnterWriteLock())
{
if (_blocks.ContainsKey(id))
{
throw new Exception("Block already exists!");
}
if (blockCount > uint.MaxValue)
{
throw new NotImplementedException("More than 2^32-1 blocks not yet supported at create-time!");
}
MetaGroupHeader xGroupHeader = null;
foreach (var xMetaGroup in _metaHeaders)
{
if (xMetaGroup.Parts.Length < _metaGroupItemsPerVirtualBlock)
{
xGroupHeader = xMetaGroup;
break;
}
}
if (xGroupHeader == null)
{
throw new Exception("No GroupHeader found with a free slot!");
}
var xNextPostValues = (from item in _metaHeaders
where item.Parts.Length > 0
select (from subItem in item.Parts
select subItem.FirstDataBlockNumber + subItem.BlockCount).Max()).ToArray();
ulong xNextPos;
if (xNextPostValues.Any())
{
xNextPos = xNextPostValues.Max();
}
else
{
xNextPos = (from item in _metaHeaders
select item.BlockId + 1).Max();
}
if ((((xNextPos + blockCount) * _virtualBlockSize) / _blockStore.BlockSize) > _blockStore.BlockCount)
{
throw new Exception("No free space found!");
}
var xNewPartsList = new List<VirtualBlockPart>(xGroupHeader.Parts);
var xNewPart = new VirtualBlockPart
{
BlockCount = (uint)blockCount,
FirstDataBlockNumber = xNextPos,
PartIndex = 0,
TotalPartCount = 1
};
var xVBlock = new VirtualBlockConfig
{
Identifier = id,
Parts = new List<VirtualBlockPart>
{
xNewPart
},
TotalLength = blockCount
};
xNewPart.VirtualBlock = xVBlock;
xNewPartsList.Add(xNewPart);
xGroupHeader.Parts = xNewPartsList.ToArray();
_blocks.Add(id, xVBlock);
}
using(_openBlocksLock.EnterWriteLock())
{
_openBlocks.Add(id, new List<VBlockContentStore>());
}
}
private void LoadConfiguration()
{
using(_configurationLock.EnterWriteLock())
{
var xBuff = new byte[_virtualBlockSize];
var xBuffSeg = new ArraySegment<byte>(xBuff);
var xNextMetaGroupBlock = 0UL;
do
{
RetrieveVirtualBlock(xNextMetaGroupBlock, xBuffSeg);
var xMetaGroupHeader = new MetaGroupHeader
{
BlockId = xNextMetaGroupBlock
};
var xStartOffset = 0;
if (xNextMetaGroupBlock == 0)
{
xStartOffset = 8;
}
xNextMetaGroupBlock = ByteConverter.ReadUInt64(xBuff, xStartOffset);
xStartOffset = 32;
var xParts = new List<VirtualBlockPart>((int)_metaGroupItemsPerVirtualBlock);
for (uint i = 0; i < _metaGroupItemsPerVirtualBlock; i++)
{
var xVBlockId = ByteConverter.ReadGuid(xBuff, xStartOffset);
if (xVBlockId != Guid.Empty)
{
var xVBlockPart = new VirtualBlockPart
{
TotalPartCount = ByteConverter.ReadUInt16(xBuff, xStartOffset + 16),
PartIndex = ByteConverter.ReadUInt16(xBuff, xStartOffset + 18),
FirstDataBlockNumber = ByteConverter.ReadUInt64(xBuff, xStartOffset + 20),
BlockCount = ByteConverter.ReadUInt32(xBuff, xStartOffset + 28)
};
VirtualBlockConfig xBlockConfig;
if(!_blocks.TryGetValue(xVBlockId, out xBlockConfig))
{
xBlockConfig = new VirtualBlockConfig();
xBlockConfig.Identifier = xVBlockId;
xBlockConfig.Parts=new List<VirtualBlockPart>(4);
_blocks.Add(xVBlockId, xBlockConfig);
}
xBlockConfig.Parts.Add(xVBlockPart);
}
xStartOffset += 32;
}
xMetaGroupHeader.Parts = xParts.ToArray();
_metaHeaders.Add(xMetaGroupHeader);
} while (xNextMetaGroupBlock != 0);
if (_blocks.Count > 0)
{
using (_openBlocksLock.EnterWriteLock())
{
foreach (var xItem in _blocks)
{
xItem.Value.TotalLength = (from item in xItem.Value.Parts
select (ulong)item.BlockCount).Sum();
_openBlocks.Add(xItem.Key, new List<VBlockContentStore>());
}
}
}
}
}