public Task <WriteResult> Append(IEnumerable <IDomainEvent> events, Maybe <long> expectedVersion = default)
{
return(_store.AppendToStreamAsync(
Id,
expectedVersion.OrElse(ExpectedVersion.NoStream),
events.Select(e => _serializer.Serialize(e, Guid.NewGuid(), _metadataContext.GetMetadata()))));
}
public static async Task ExecuteAsync <TState>(IEventStore store, ICommand command, Func <TState, IEvent[]> action, Func <IEvent[], Task> pub)
where TState : class, new()
{
if (command.CorrelationId == default(Guid))
{
throw new ArgumentException("CorrelationId required");
}
var aggregateName = typeof(TState).Name.Replace("State", "Aggregate").ToLower();
var streamName = $"{aggregateName}-{command.AggregateId}";
var happend = await store.LoadEventStreamAsync(streamName, 0);
var state = happend.Events.Rehydrate <TState>();
var events = action(state);
events
.Where(x => x.Meta == null)
.ForEach(x => x.Meta = new Dictionary <string, string>());
events
.ForEach(x => x
.Tap(e => e.Meta.AddMetaData(happend.Version + 1, streamName, aggregateName, command))
.Tap(e => e.Meta.AddTypeInfo(e))
);
if (events.Any())
{
await store.AppendToStreamAsync(streamName, events.Last().GetVersion(), events);
}
await pub(events); //need to always execute due to locks
}
public async Task <bool> SaveOrder(EventUserInfo eventUserInfo, Order aggregate, OrderSnapshot snapshot = null)
{
if (aggregate.Changes.Any())
{
var streamId = aggregate.Id.ToString();
// save all events
bool savedEvents = await _eventStore.AppendToStreamAsync(eventUserInfo, streamId,
aggregate.Version,
aggregate.Changes);
// save snapshot
if (savedEvents && snapshot != null && _snapshotStore != null)
{
await SaveOrderSnapshot(snapshot);
}
return(savedEvents);
}
return(true);
}
public async Task <bool> SaveMeterAsync(Meter meter)
{
if (meter.Changes.Any())
{
var streamId = $"meter:{meter.MeterId}";
return(await _eventStore.AppendToStreamAsync(
streamId,
meter.Version,
meter.Changes));
}
return(true);
}
/// <summary>
/// Commits any pending events previously appended with <see cref="Append{T}"/> to the
/// <see cref="IEventStore"/> specified by <paramref name="store"/>, and clears the queue of pending events.
/// </summary>
/// <param name="store">The <see cref="IEventStore"/> to store events in.</param>
/// <param name="configuration">The configuration of the aggregate.</param>
/// <param name="cancellationToken">Cancellation token.</param>
/// <returns>A <see cref="Task{TResult}"/></returns>
/// <exception cref="InvalidOperationException">
/// If there are no pending events, previously appended with <see cref="Append{T}"/>, to commit.
/// </exception>
/// <remarks>
/// Intended to be wrapped by a public member on the aggregate, in order to keep the aggregate configuration
/// private, like so:
/// <code>
/// public sealed class Goat : Aggregate<GoatId, Goat>
/// {
/// private static readonly AggregateConfiguration<GoatId, Goat> Configuration =
/// new AggregateConfiguration<GoatId, Goat>("goat");
///
/// public Task CommitAsync(IEventStore store) => CommitAsync(store, Configuration);
/// }
/// </code>
/// </remarks>
protected internal async Task CommitAsync(
IEventStore store,
AggregateConfiguration <TIdentity, TAggregate> configuration,
CancellationToken cancellationToken = default
)
{
if (_pendingEvents.Count == 0)
{
throw new InvalidOperationException("There are no pending events to commit");
}
var pendingEvents = _pendingEvents.ToArray();
await store.AppendToStreamAsync(Id, configuration, _versionNumber, pendingEvents, cancellationToken);
_versionNumber += _pendingEvents.Count;
_pendingEvents.Clear();
}
public static async Task <long> AppendToStreamAsync(this IEventStore store, string streamName, params IEvent[] events)
{
var r = await store.LoadEventStreamAsync(streamName, 0); //TODO optimize :)
return(await store.AppendToStreamAsync(streamName, r.Version, events));
}
