public bool TryTakeSnapshot(Domain.AggregateRoot aggregateRoot, out Snapshot snapshot)
{
snapshot = null;
try
{
var payload = ((dynamic)aggregateRoot).CreateSnapshot();
snapshot = new Snapshot(aggregateRoot.EventSourceId, aggregateRoot.Version, payload);
return(true);
}
catch (Exception ex)
{
Log.ErrorFormat("Cannot take snapshot for '{0}' aggregate. {1}",
aggregateRoot.GetType().FullName, ex.Message);
snapshot = null;
return(false);
}
}
public bool TryLoadFromSnapshot(Type aggregateRootType, Snapshot snapshot, CommittedEventStream committedEventStream, out Domain.AggregateRoot aggregateRoot)
{
aggregateRoot = null;
if (snapshot == null)
{
return(false);
}
if (AggregateSupportsSnapshot(aggregateRootType, snapshot.Payload.GetType()))
{
try
{
Log.DebugFormat("Reconstructing aggregate root {0}[{1}] from snapshot", aggregateRootType.FullName,
snapshot.EventSourceId.ToString("D"));
aggregateRoot = _aggregateRootCreator.CreateAggregateRoot(aggregateRootType);
aggregateRoot.InitializeFromSnapshot(snapshot);
aggregateRoot.RestoreFromSnapshot(snapshot.Payload);
Log.DebugFormat("Applying remaining historic event to reconstructed aggregate root {0}[{1}]",
aggregateRootType.FullName, snapshot.EventSourceId.ToString("D"));
aggregateRoot.InitializeFromHistory(committedEventStream);
}
catch (Exception ex)
{
Log.ErrorFormat("Cannot load snapshot for '{0}' aggregate. {1}",
aggregateRoot.GetType().FullName, ex.Message);
aggregateRoot = null;
return(false);
}
return(true);
}
return(false);
}
