public CachedRoot(object aggregateRoot, long globalSequenceNumber)
{
AggregateRoot = aggregateRoot;
IsOk = true;
_globalSequenceNumber = globalSequenceNumber;
_aggregateRootInfo = new AggregateRootInfo(aggregateRoot as AggregateRoot);
}
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 AggregateRoot Get <TAggregateRoot>(string aggregateRootId, IUnitOfWork unitOfWork, long maxGlobalSequenceNumber = long.MaxValue, bool createIfNotExists = false)
{
if (!EnabledFor <TAggregateRoot>())
{
return(_aggregateRootRepository.Get <TAggregateRoot>(aggregateRootId, unitOfWork, maxGlobalSequenceNumber, createIfNotExists));
}
var snapshot = _snapshotStore.LoadSnapshot <TAggregateRoot>(aggregateRootId, maxGlobalSequenceNumber);
if (snapshot == null)
{
var aggregateRootInstance = _aggregateRootRepository.Get <TAggregateRoot>(aggregateRootId, unitOfWork, maxGlobalSequenceNumber, createIfNotExists);
var checkedOutSequenceNumber = new AggregateRootInfo(aggregateRootInstance).SequenceNumber;
if (maxGlobalSequenceNumber != long.MaxValue)
{
_snapshotStore.SaveSnapshot <TAggregateRoot>(aggregateRootId, aggregateRootInstance, maxGlobalSequenceNumber);
}
OnCommitted <TAggregateRoot>(aggregateRootId, unitOfWork, aggregateRootInstance, checkedOutSequenceNumber);
return(aggregateRootInstance);
}
var preparedInstance = PrepareFromSnapshot <TAggregateRoot>(snapshot, maxGlobalSequenceNumber, unitOfWork, aggregateRootId);
var sequenceNumberOfPreparedInstance = new AggregateRootInfo(preparedInstance).SequenceNumber;
OnCommitted <TAggregateRoot>(aggregateRootId, unitOfWork, preparedInstance, sequenceNumberOfPreparedInstance);
return(preparedInstance);
}
public void SaveSnapshot <TAggregateRoot>(string aggregateRootId, AggregateRoot aggregateRootInstance, long validFromGlobalSequenceNumber)
{
var snapshotAttribute = GetSnapshotAttribute(aggregateRootInstance.GetType());
var info = new AggregateRootInfo(aggregateRootInstance);
var serializedInstance = _sturdylizer.SerializeObject(info.Instance);
_snapshots.Insert(new NewSnapshot
{
Id = string.Format("{0}/{1}", aggregateRootId, info.SequenceNumber),
AggregateRootId = aggregateRootId,
Data = serializedInstance,
ValidFromGlobalSequenceNumber = validFromGlobalSequenceNumber,
Version = snapshotAttribute.Version
}, WriteConcern.Unacknowledged);
}
void OnCommitted <TAggregateRoot>(string aggregateRootId, IUnitOfWork unitOfWork, AggregateRoot aggregateRootInstance, long checkedOutSequenceNumber)
{
unitOfWork.Committed += eventBatch =>
{
var aggregateRootHasChanges = new AggregateRootInfo(aggregateRootInstance).SequenceNumber != checkedOutSequenceNumber;
if (!aggregateRootHasChanges)
{
return;
}
var lastGlobalSequenceNumber = eventBatch.Max(e => e.GetGlobalSequenceNumber());
_snapshotStore.SaveSnapshot <TAggregateRoot>(aggregateRootId, aggregateRootInstance, lastGlobalSequenceNumber);
};
}
