internal bool UpdateKey(TKey key, Guid transaction)
{
Guid existing;
if (_trxModifiedKeys.TryGetValue(key, out existing) && existing != transaction)
{
return(false);
}
var rr = Read(key, transaction);
if (null != rr && CompareEq.Equals(key, rr.Address.Key))
{
return(true);
}
_trxOperations.GetOrAdd(transaction, new ConcurrentList <SdsCommand <TKey> >()).Add(new SdsCommand <TKey>
{
Key = key,
Position =
null == rr
? -1
: rr.
Address
.
Position,
Size =
null == rr
? 0
: rr.
Address
.Size,
TableId = Id,
Code =
CommandCode.Put
});
if (existing != transaction)
{
_trxModifiedKeys.TryAdd(key, transaction);
}
return(true);
}
internal ReadInfo <TKey> Read(TKey key, Guid transaction)
{
byte[] data;
Guid modified;
if (_trxModifiedKeys.TryGetValue(key, out modified) && modified == transaction)
{
var comm = _trxOperations.GetOrAdd(transaction, new ConcurrentList <SdsCommand <TKey> >())
.LastOrDefault(x => CompareEq.Equals(x.Key, key));
if (null != comm)
{
if (comm.Code == CommandCode.Put)
{
var eTag = Guid.Empty;
data = ReadData(comm, eTag);
return(new ReadInfo <TKey>
{
Address =
new StoreAddress <TKey>
{
Key = comm.Key, Position = comm.Position, Size = comm.Size
},
GetData = delegate
{
var etag = Guid.Empty;
var retval = data ?? (data = ReadData(comm, etag));
return retval;
},
ETag = eTag
});
}
return(null);
}
}
return(StoreRead(key));
}
