public VersionedRecord(byte[] versionInfoBytes, IMemoryManager memoryManager, ISnapshotData snapshotData)
{
if (versionInfoBytes == null)
{
throw new ArgumentNullException(nameof(versionInfoBytes));
}
if (memoryManager == null)
{
throw new ArgumentNullException(nameof(memoryManager));
}
if (snapshotData == null)
{
throw new ArgumentNullException(nameof(snapshotData));
}
using (var ms = new MemoryStream(versionInfoBytes))
{
while (ms.Position < ms.Length)
{
_versions.Add(VersionInfo.Read(ms));
}
}
_memoryManager = memoryManager;
_snapshotData = snapshotData;
}
public async Task <TAggregate> FetchAsync(Guid aggregateId)
{
var snapshot = await _context.Snapshots
.Find <SnapshotDao>(x => x.AggregateId == aggregateId)
.SortByDescending(x => x.Version)
.FirstOrDefaultAsync();
int version = -1;
ISnapshotData data = null;
if (snapshot != null)
{
version = snapshot.Version;
data = snapshot.Data;
}
var events = await _context.Events
.Find <EventDao>(x => x.AggregateId == aggregateId && x.Version > version)
.ToListAsync();
var domainEvents = events.Select(e => e.Data);
var aggregate = new TAggregate();
aggregate.Initialize(data, domainEvents);
return(aggregate);
}
public int CreateTransaction(out ISnapshotData snapshotData)
{
snapshotData = new SnapshotDataStub(_transactions);
var tr = new DataTankerTransaction(this, snapshotData, _transactions.Count);
_transactions.Add(tr);
return(tr.Id);
}
public DataTankerTransaction(ITransactionInventory inventory, ISnapshotData snapshotData, int id)
{
if (id == int.MaxValue)
{
throw new DataTankerException("Transaction number overflow");
}
_inventory = inventory;
SnapshotData = snapshotData ?? throw new ArgumentNullException(nameof(snapshotData));
Id = id;
State = TransactionState.Active;
}
public void Initialize(ISnapshotData snapshot, IEnumerable <IDomainEvent> changes)
{
if (changes.Count() == 0 && snapshot == null)
{
throw new InvalidOperationException("Aggregate does not exist");
}
if (snapshot != null)
{
Mutate(snapshot);
Version++;
}
foreach (var change in changes)
{
Mutate(change);
Version++;
}
}
private void Mutate(ISnapshotData snapshot) => ((dynamic)this).On((dynamic)snapshot);