private async Task PrepareForEventInsertionAsync(IDomainEvent @event)
{
var evtType = @event.GetType();
ISnapshotBehavior behavior = _snapshotBehaviorProvider?.GetBehaviorForEventType(evtType);
CheckIdAndSetNewIfNeeded(@event);
ulong?sequence = null;
if (@event.AggregateId != null)
{
await SetSequenceAsync(@event, sequence).ConfigureAwait(false);
if (_archiveBehavior != SnapshotEventsArchiveBehavior.Disabled &&
behavior?.IsSnapshotNeeded(@event) == true)
{
var aggregateState = await GetRehydratedStateAsync(@event.AggregateId, @event.AggregateType).ConfigureAwait(false);
var result = behavior.GenerateSnapshot(aggregateState);
if (result?.Any() == true)
{
if (aggregateState != null)
{
await InsertSnapshotAsync(
new Snapshot(@event.AggregateId, @event.AggregateType, aggregateState, behavior.GetType(), DateTime.Now)
).ConfigureAwait(false);
}
await StoreArchiveEventsAsync(result).ConfigureAwait(false);
}
}
}
}
/// <summary>
/// Store a domain event in the event store
/// </summary>
/// <param name="event">Event instance to be persisted.</param>
public async Task StoreDomainEventAsync(IDomainEvent @event)
{
var eventType = @event.GetType();
if (eventType.IsDefined(typeof(EventNotPersistedAttribute)))
{
return;
}
int currentSeq = -1;
if (@event.AggregateId.HasValue)
{
ISnapshotBehavior behavior = _snapshotBehaviorProvider?.GetBehaviorForEventType(eventType);
if (behavior != null && await behavior.IsSnapshotNeededAsync(@event.AggregateId.Value, @event.AggregateType).ConfigureAwait(false))
{
var result = await behavior.GenerateSnapshotAsync(@event.AggregateId.Value, @event.AggregateType, null).ConfigureAwait(false);
if (result.Snapshot != null)
{
await EventStoreAzureDbContext.Client.CreateDocumentAsync(EventStoreAzureDbContext.SnapshotDatabaseLink, result.Snapshot).ConfigureAwait(false);
}
}
currentSeq = EventStoreAzureDbContext.Client.CreateDocumentQuery <Event>(EventStoreAzureDbContext.EventsDatabaseLink)
.Where(e => e.AggregateId == @event.AggregateId.Value && e.AggregateType == @event.AggregateType.AssemblyQualifiedName).Count();
}
await SaveEvent(@event, ++currentSeq).ConfigureAwait(false);
}