/// <summary>
/// Loads the aggregate using the latest snapshot and then applies all events
/// in the event stream from the stream revision that the snapshot was taken.
/// </summary>
/// <typeparam name="T">Snapshot type</typeparam>
/// <param name="aggregate">The aggregate.</param>
/// <returns>A <see cref="Task"/> representing the asynchronous operation.</returns>
public async Task LoadFromLatestSnapshotAsync <T>(IAggregateWithSnapshot <T> aggregate)
where T : class
{
AggregateWithSnapshot <T> baseAggregate = aggregate as AggregateWithSnapshot <T>;
if (baseAggregate == null)
{
string exceptionMessage = string.Format(CultureInfo.InvariantCulture, "The supplied Aggregate did not inherit from {0}.", typeof(Aggregate).FullName);
throw new EventSourcingException(exceptionMessage);
}
// Load from the snapshot.
EventStoreSnapshot eventStoreSnapshot = await this.eventStoreProvider.ReadSnapshotAsync(aggregate.SnapshotStreamId).ConfigureAwait(false);
baseAggregate.Load(eventStoreSnapshot);
// Now load all events since the snapshot was taken.
IEventStoreStream eventStoreStream =
await this.eventStoreProvider.ReadEventsAsync(
aggregate.EventStreamId,
eventStoreSnapshot.StreamRevision,
ExpectedStreamRevision.End).ConfigureAwait(false);
baseAggregate.Load(eventStoreStream);
}
public async Task LoadAsync(IAggregate aggregate)
{
Aggregate baseAggregate = aggregate as Aggregate;
if (baseAggregate == null)
{
string exceptionMessage = string.Format(CultureInfo.InvariantCulture, "The supplied Aggregate did not inherit from {0}.", typeof(Aggregate).FullName);
throw new EventSourcingException(exceptionMessage);
}
IEventStoreStream eventStoreStream = await this.eventStoreProvider.ReadEventsAsync(aggregate.EventStreamId).ConfigureAwait(false);
if (eventStoreStream.Count < 1)
{
string exceptionMessage = string.Format(CultureInfo.InvariantCulture, "No events could be found in the event store for Event Stream ID '{0}'.", aggregate.EventStreamId);
throw new EventSourcingException(exceptionMessage);
}
baseAggregate.Load(eventStoreStream);
}
protected async Task Given_A_Stream_Of_10_Events_When_Reading_Events_From_Three_To_Nine_Then_Six_Events_Should_Be_Returned(IEventStoreProvider eventStoreProvider)
{
// Arrange
string eventStreamId = Guid.NewGuid().ToEventStreamIdFormattedString();
// Act
for (int i = 0; i < 10; i++)
{
Guid eventId = Guid.NewGuid();
EventStoreMessage eventStoreMessage = new EventStoreMessage(eventId, new object());
eventStoreProvider.AppendEvents(eventStreamId, eventStoreMessage);
}
await eventStoreProvider.CommitEventsAsync(eventStreamId, ExpectedStreamRevision.New).ConfigureAwait(false);
// Assert
IEventStoreStream eventStoreStream = await eventStoreProvider.ReadEventsAsync(eventStreamId, 3, 9).ConfigureAwait(false);
Assert.Equal(6, eventStoreStream.Count);
}
public async Task <bool> LoadIfExistsAsync(IAggregate aggregate)
{
Aggregate baseAggregate = aggregate as Aggregate;
if (baseAggregate == null)
{
string exceptionMessage = string.Format(CultureInfo.InvariantCulture, "The supplied Aggregate did not inherit from {0}.", typeof(Aggregate).FullName);
throw new EventSourcingException(exceptionMessage);
}
bool streamExists = await this.eventStoreProvider.StreamExistsAsync(aggregate.EventStreamId).ConfigureAwait(false);
if (!streamExists)
{
return(false);
}
IEventStoreStream eventStoreStream = await this.eventStoreProvider.ReadEventsAsync(aggregate.EventStreamId).ConfigureAwait(false);
baseAggregate.Load(eventStoreStream);
return(true);
}
public static void SubscribeToEventStream(this IActor actor, IEventStoreStream eventStoreStream, bool closeSubscriptionOnDispose = false)
{
var eventStoreBus = actor.GetConnectedBus <IEventStoreBus>();
eventStoreBus.SubscribeToEventStream(eventStoreStream, actor.OnMessageReceived, closeSubscriptionOnDispose);
}
