AggregateRoot PrepareFromSnapshot <TAggregateRoot>(Snapshot matchingSnapshot, long maxGlobalSequenceNumber, IUnitOfWork unitOfWork, string aggregateRootId)
{
var instance = matchingSnapshot.Instance;
var hadEventsAppliedToIt = false;
var stopwatch = Stopwatch.StartNew();
if (matchingSnapshot.ValidFromGlobalSequenceNumber < maxGlobalSequenceNumber)
{
var info = new AggregateRootInfo(instance);
foreach (var e in _eventStore.Load(aggregateRootId, info.SequenceNumber + 1))
{
if (e.GetGlobalSequenceNumber() > maxGlobalSequenceNumber)
{
break;
}
var domainEvent = _domainEventSerializer.Deserialize(e);
info.Apply(domainEvent, unitOfWork);
hadEventsAppliedToIt = true;
}
info.SetUnitOfWork(unitOfWork);
}
if (hadEventsAppliedToIt && stopwatch.Elapsed > _preparationThreshold)
{
_snapshotStore.SaveSnapshot <TAggregateRoot>(aggregateRootId, instance, maxGlobalSequenceNumber);
}
return(instance);
}
public void MaybeApply(DomainEvent domainEvent, RealUnitOfWork realUnitOfWork, long requestedGlobalSequenceNumber)
{
// other roots' events are not relevant
if (domainEvent.GetAggregateRootId() != _aggregateRootInfo.Id)
{
return;
}
var globalSequenceNumberFromEvent = domainEvent.GetGlobalSequenceNumber();
// don't do anything if we are not supposed to go this far
if (globalSequenceNumberFromEvent > requestedGlobalSequenceNumber)
{
return;
}
// don't do anything if the event is in the past
if (globalSequenceNumberFromEvent <= _globalSequenceNumber)
{
return;
}
// if this entry is a future version of the requested version, it's not ok.... sorry!
if (_globalSequenceNumber > requestedGlobalSequenceNumber)
{
IsOk = false;
return;
}
try
{
var sequenceNumberFromEvent = domainEvent.GetSequenceNumber();
var expectedNextSequenceNumber = _aggregateRootInfo.SequenceNumber + 1;
if (expectedNextSequenceNumber != sequenceNumberFromEvent)
{
IsOk = false;
return;
}
_aggregateRootInfo.Apply(domainEvent, realUnitOfWork);
_globalSequenceNumber = globalSequenceNumberFromEvent;
}
catch (Exception exception)
{
_logger.Warn(exception, "Got an error while bringing cache entry for {0} up-to-date to {1}",
_aggregateRootInfo.Id, requestedGlobalSequenceNumber);
IsOk = false;
}
}
