public TAggregate GetById <TAggregate>(Guid id, int version = int.MaxValue) where TAggregate : class, IEventSource
{
if (version <= 0)
{
throw new InvalidOperationException("Cannot get version <= 0");
}
var streamName = _streamNameBuilder.GenerateForAggregate(typeof(TAggregate), id);
var aggregate = ConstructAggregate <TAggregate>();
long sliceStart = 0;
StreamEventsSlice currentSlice;
var appliedEventCount = 0;
do
{
long sliceCount = sliceStart + ReadPageSize <= version
? ReadPageSize
: version - sliceStart;
currentSlice = _streamStoreConnection.ReadStreamForward(streamName, sliceStart, (int)sliceCount);
if (currentSlice is StreamNotFoundSlice)
{
throw new AggregateNotFoundException(id, typeof(TAggregate));
}
if (currentSlice is StreamDeletedSlice)
{
throw new AggregateDeletedException(id, typeof(TAggregate));
}
sliceStart = currentSlice.NextEventNumber;
appliedEventCount += currentSlice.Events.Length;
aggregate.RestoreFromEvents(currentSlice.Events.Select(evt => _eventSerializer.Deserialize(evt)));
} while (version > currentSlice.NextEventNumber && !currentSlice.IsEndOfStream);
if (version != Int32.MaxValue && version != appliedEventCount)
{
throw new AggregateVersionException(id, typeof(TAggregate), version, aggregate.ExpectedVersion);
}
if (version != Int32.MaxValue && aggregate.ExpectedVersion != version - 1)
{
throw new AggregateVersionException(id, typeof(TAggregate), version, aggregate.ExpectedVersion);
}
return(aggregate);
}
public IReadOnlyList <IDomainEvent> GetEvents(Guid aggregateId)
{
var events = new List <IDomainEvent>();
using (var context = new EventStoreContext(ConnectionString.Get()))
{
foreach (var dbEvent in context.Events.Where(a => a.AggregateId == aggregateId))
{
events.Add(_eventSerializer.Deserialize <IDomainEvent>(dbEvent.Data));
}
}
return(events);
}
private IRecordedEvent Transform(ReactiveEventEntity entity)
{
return(new RecordedEvent(
entity.EventNumber,
entity.EventId,
entity.EventType,
entity.AggregateId,
entity.AggregateType,
entity.AggregateVersion,
_serializer.Deserialize(entity.SerializedData, _typeMapper.GetEventType(entity.EventType)) as IEvent,
_serializer.Deserialize(entity.SerializedMetadata, _typeMapper.GetMetadataType(entity.EventType)) as IMetadata,
DateTimeOffset.Parse(entity.Recorded)
));
}
public async Task <TA> RehydrateAsync(TKey key)
{
var partitionKey = new PartitionKey(key.ToString());
var events = new List <IDomainEvent <TKey> >();
using var setIterator = _container.GetItemQueryIterator <EventData <TKey> >(requestOptions: new QueryRequestOptions { MaxItemCount = 100, PartitionKey = partitionKey });
while (setIterator.HasMoreResults)
{
foreach (var item in await setIterator.ReadNextAsync())
{
var @event = _eventSerializer.Deserialize <TKey>(item.Type, item.Data);
events.Add(@event);
}
}
if (!events.Any())
{
return(null);
}
var result = BaseAggregateRoot <TA, TKey> .Create(events.OrderBy(e => e.AggregateVersion));
return(result);
}
public static IObservable <EventWithPosition <TEvent> > DeserializeWithPosition <TEvent>(
this IObservable <Event> source,
Action <Exception> exceptionHandler = null,
IEventSerializer serializer = null)
{
serializer = serializer ?? new EventSerializer();
exceptionHandler = exceptionHandler ?? (_ => { });
return
(source.Select(@event =>
{
if ([email protected](typeof(TEvent).Name))
{
return default(EventWithPosition <TEvent>);
}
try
{
return new EventWithPosition <TEvent>(
serializer.Deserialize <TEvent>(@event),
@event.Position);
}
catch (Exception e)
{
exceptionHandler(e);
return default(EventWithPosition <TEvent>);
}
})
.Where(e => !Equals(e, default(EventWithPosition <TEvent>))));
}
public async Task <T> Load <T>(string id) where T : Aggregate, new()
{
Ensure.NotEmptyString(id, nameof(id));
var stream = StreamName.For <T>(id);
var aggregate = new T();
try {
await _eventStore.ReadStream(stream, StreamReadPosition.Start, Fold);
}
catch (Exceptions.StreamNotFound e) {
throw new Exceptions.AggregateNotFound <T>(id, e);
}
return(aggregate);
void Fold(StreamEvent streamEvent)
{
var evt = Deserialize(streamEvent);
if (evt == null)
{
return;
}
aggregate !.Fold(evt);
}
object?Deserialize(StreamEvent streamEvent)
=> _serializer.Deserialize(streamEvent.Data.AsSpan(), streamEvent.EventType);
}
private void Run_ShouldWriteEventData(IEventSerializer serializer)
{
var configuration = SetupDatabase();
var subscriber = new DatabaseEventSubscriber <IEvent>(configuration, serializer);
var aggregateId = Guid.NewGuid().ToString();
var expectedData = $"This is my random data {Guid.NewGuid()}";
var testEvent = new EventWithData(aggregateId, expectedData);
subscriber.OnEvent(testEvent);
var connection = configuration.CreateConnection();
connection.Open();
var command = connection.CreateCommand();
command.CommandText = $"select data from {configuration.TableName}";
var actualBytes = command.ExecuteScalar();
var actual = serializer.Deserialize(testEvent.Type, (byte[])actualBytes);
Assert.IsType <EventWithData>(actual);
Assert.Equal(expectedData, ((EventWithData)actual).Data);
}
protected async Task Handler(StreamSubscription sub, ResolvedEvent re, CancellationToken cancellationToken) {
_debugLog?.Invoke(
"Subscription {Subscription} got an event {@Event}",
sub.SubscriptionId,
re
);
_lastProcessedPosition = GetPosition(re);
if (re.Event.EventType.StartsWith("$")) {
await Store();
}
try {
var evt = _eventSerializer.Deserialize(re.Event.Data.Span, re.Event.EventType);
if (evt != null) {
_debugLog?.Invoke("Handling event {Event}", evt);
await Task.WhenAll(
_projections.Select(
x => x.HandleEvent(evt, (long?) re.OriginalPosition?.CommitPosition)
)
);
}
}
catch (Exception e) {
_log.LogWarning(e, "Error when handling the event {Event}", re.Event.EventType);
}
await Store();
Task Store() => StoreCheckpoint(GetPosition(re), cancellationToken);
}
public async Task HandleAsync(Event @event)
{
_context.KeepAlive();
await _handler.HandleAsync(_context, _serializer.Deserialize(@event));
_context.KeepAlive();
}
public async Task HandleAsync(Event @event)
{
var command = _serializer.Deserialize(@event);
await _handler.HandleAsync(
new DomainCommandContext(_queryEndpointId, command.CreateEventContext(_hubClientFactory)),
command.Data);
}
public async Task <KeyValuePair <int, GrainState <T> > > ReadStateFromStorage()
{
_stream = $"{typeof(T).Name}:{ModelVersion()}:{this.GrainId()}";
var stream = _eventStore.ReadStreamAsync(
Direction.Forwards,
_stream,
StreamPosition.Start);
var state = new GrainState <T>();
var version = 0;
if (await stream.ReadState != ReadState.StreamNotFound)
{
await foreach (var resolvedEvent in stream)
{
var json = Encoding.UTF8.GetString(resolvedEvent.Event.Data.Span);
try
{
var eventObj = _eventSerializer.Deserialize(typeof(T), resolvedEvent.Event.EventType, json);
state = state.Apply(eventObj);
version++;
}
catch (Exception ex)
{
_logger.LogCritical(5004, ex, ex.Message);
return(new KeyValuePair <int, GrainState <T> >(-1, new GrainState <T>()));
}
}
}
return(new KeyValuePair <int, GrainState <T> >(version, state));
}
public IDisposable SubscribeToStreamFrom(
string stream,
long?lastCheckpoint,
bool resolveLinkTos,
Action <Message> eventAppeared,
Action liveProcessingStarted = null,
Action <SubscriptionDropReason, Exception> subscriptionDropped = null,
UserCredentials userCredentials = null,
int readBatchSize = 500)
{
var settings = new CatchUpSubscriptionSettings(10, readBatchSize, false);
StreamName = stream;
var sub = _eventStoreConnection.SubscribeToStreamFrom(
stream,
lastCheckpoint,
settings,
resolvedEvent => {
Interlocked.Exchange(ref _position, resolvedEvent.EventNumber);
eventAppeared(_serializer.Deserialize(resolvedEvent) as Message);
},
_ => liveProcessingStarted?.Invoke(),
(reason, exception) => subscriptionDropped?.Invoke(reason, exception),
userCredentials);
return(new Disposer(() => { sub.Dispose(); return Unit.Default; }));
}
private async Task HandleEvent(StreamSubscription subscription, ResolvedEvent resolvedEvent,
CancellationToken cancellationToken)
{
var domainEvent = _eventSerializer.Deserialize(resolvedEvent);
if (domainEvent == null)
{
return;
}
_logger.LogInformation($"PullRequestCommentsProjector handled event: {domainEvent}");
switch (domainEvent)
{
case SingleCommentWasAdded added:
var comment = new PullRequestComment
{
PullRequestId = added.PullRequestId,
CommentId = added.CommentId,
PostedAt = added.OccurredAt,
Author = added.Author,
Text = added.Text
};
await _repository.Save(comment);
break;
}
}
private IEnumerable <IRecordedEvent> Transform(IEnumerable <RecordedEventEntity> entities)
{
foreach (var entity in entities)
{
yield return(new RecordedEvent(
entity.EventNumber,
entity.EventId,
entity.EventType,
entity.AggregateId,
entity.AggregateType,
entity.AggregateVersion,
_eventSerializer.Deserialize(entity.SerializedData, _typeMapper.GetEventType(entity.EventType)) as IEvent,
_eventSerializer.Deserialize(entity.SerializedMetadata, _typeMapper.GetMetadataType(entity.EventType)) as IMetadata,
entity.Recorded
));
}
}
private StoredEvent ToStoredEvent(RecordedEvent recordedEvent)
=> new StoredEvent(
recordedEvent.StreamId,
recordedEvent.Id,
recordedEvent.Number,
recordedEvent.Type,
recordedEvent.Created,
(IDomainEvent)_serializer.Deserialize(recordedEvent));
protected virtual void GotEvent(RecordedEvent recordedEvent)
{
Interlocked.Exchange(ref StreamPosition, recordedEvent.EventNumber);
if (Serializer.Deserialize(recordedEvent) is IMessage @event)
{
Bus.Publish(@event);
}
}
public T Load(int id)
{
IList <Event> result = _session.QueryOver <Event>().Where(f => f.AggregateId == id).List();
IEnumerable <IDomainEvent> domainEvents = result.Select(f => _serializer.Deserialize(Type.GetType(f.Type, true), f.Data));
T o = new T();
o.LoadFromHistory(domainEvents);
return(o);
}
private DomainEventStream ConvertFrom(EventStream record)
{
return(new DomainEventStream(
record.CommandId,
record.AggregateRootId,
record.AggregateRootTypeName,
record.Version,
record.CreatedOn,
_eventSerializer.Deserialize <IDomainEvent>(_jsonSerializer.Deserialize <IDictionary <string, string> >(record.Events))));
}
Event Deserialize(ResolvedEvent @event, IEventSerializer serializer)
{
var e = serializer.Deserialize(
new EventData(
@event.OriginalEvent.EventId, @event.OriginalEvent.EventType,
false, @event.OriginalEvent.Data,
@event.OriginalEvent.Metadata));
e.Version = @event.Event.EventNumber;
return(e);
}
public IEnumerable <IDomainEvent> GetEventsFor(Guid aggregateId)
{
var results = _repository.Get(x => x.AggregateId == aggregateId).ToList();
foreach (var eventEntity in results)
{
var type = _typeFactory.GetFor(eventEntity.EventName);
var domainEvent = _serializer.Deserialize(eventEntity.EventData, type);
yield return(domainEvent);
}
}
private IDomainEvent Deserialize(Models.Event entity)
{
var domainEvent = _eventSerializer.Deserialize(entity.Data, Type.GetType(entity.Type));
domainEvent.AggregateId = entity.AggregateId;
domainEvent.AppliedByUserId = entity.AppliedByUserId;
domainEvent.Version = entity.AggregateVersion;
domainEvent.Timestamp = entity.Timestamp;
domainEvent.Id = entity.EventId;
return(domainEvent);
}
protected async Task HandleMessage(Message msg)
{
var eventType = msg.UserProperties["type"] as string;
var domainEvent = _eventSerializer.Deserialize <Guid>(eventType, msg.Body);
if (null == domainEvent)
{
throw new SerializationException($"unable to deserialize event {eventType} : {msg.Body}");
}
var @event = EventReceivedFactory.Create((dynamic)domainEvent);
await _mediator.Publish(@event, CancellationToken.None);
}
public void OnRelayMessage(byte[] data)
{
var remoteEvt = _serializer.Deserialize(data);
if (_callbacks.ContainsKey(remoteEvt.Type))
{
_callbacks[remoteEvt.Type](remoteEvt);
}
else
{
Debug.Log($"No follow up for relayed message of type {remoteEvt.Type}");
}
}
private IEnumerable <IRecordedEvent> QueryEvents(string query)
{
using (var connection = new SqlConnection(_options.ConnectionString))
{
var command = new SqlCommand(query, connection);
connection.Open();
var reader = command.ExecuteReader();
while (reader.Read())
{
var eventNumber = reader.GetInt64(0);
var eventId = reader.GetGuid(1);
var eventType = reader.GetString(2);
var aggregateId = reader.GetGuid(3);
var aggregateType = reader.GetString(4);
var aggregateVersion = reader.GetInt64(5);
var serializedData = reader.GetString(6);
var serializedMetadata = reader.GetString(7);
var recorded = reader.GetDateTimeOffset(8);
yield return(new RecordedEvent(
eventNumber,
eventId,
eventType,
aggregateId,
aggregateType,
aggregateVersion,
_serializer.Deserialize(serializedData, _typeMapper.GetEventType(eventType)) as IEvent,
_serializer.Deserialize(serializedMetadata, _typeMapper.GetMetadataType(eventType)) as IMetadata,
recorded
));
}
}
}
protected virtual void EventRead(RecordedEvent recordedEvent)
{
// do not publish or increase counters if cancelled
if (_cancelled)
{
return;
}
Interlocked.Exchange(ref StreamPosition, recordedEvent.EventNumber);
firstEventRead = true;
if (Serializer.Deserialize(recordedEvent) is IMessage @event)
{
Bus.Publish(@event);
}
}
private void Process <TEvent>(Action <TEvent> handle, BrokeredMessage brokeredMessage) where TEvent : DomainEvent
{
var jsonEvent = brokeredMessage.GetBody <string>();
var productDeletedEvent = _eventSerializer.Deserialize <TEvent>(jsonEvent);
handle(productDeletedEvent);
try
{
brokeredMessage.Complete();
}
catch (Exception ex)
{
//do something else, e.g log
brokeredMessage.DeadLetter(); //move to dead letter queue to inspect later
}
}
public static TEvent ToDomainEvent <TEvent>(
StoredDomainEvent storedEvent,
IEventSerializer serializer)
where TEvent : IDomainEvent
{
var eventType = default(Type);
try
{
eventType = Type.GetType(storedEvent.AggregateRootTypeName);
}
catch (Exception ex)
{
throw new InvalidOperationException(string.Format("Domain event type load error, because: {0}", ex));
}
return(serializer.Deserialize <TEvent>(storedEvent.EventBody));
}
public async Task Handle(NotificationMessage <string> notificationMessage, CancellationToken cancellationToken)
{
if (notificationMessage == null)
{
throw new ArgumentNullException(nameof(notificationMessage));
}
var eventStore = _jsonSerializer.Deserialize <EventStore>(notificationMessage.Message);
var @event = _eventSerializer.Deserialize <Event>(eventStore.TypeName, eventStore.PayLoad);
var projection = Invoker.CreateInstanceOfProjection <SpeechProjection>();
projection.Project(@event);
if (projection.IsDeleted)
{
await _elasticSearchClient.DeleteAsync(projection).ContinueWith(
result =>
{
if (result.Status == TaskStatus.RanToCompletion)
{
Console.WriteLine($"**ElasticSearchNotifer::Handle - DeleteAsync {projection.Id} ");
_publisher.PublishAsync(Topics.ReadModelAcknowledged, projection);
}
else if (result.Status == TaskStatus.Faulted)
{
Console.WriteLine($"**ElasticSearchNotifer::Handle - DeleteAsync {result.Exception?.GetBaseException().Message}");
}
}, cancellationToken);
}
else
{
await _elasticSearchClient.CreateAsync(projection).ContinueWith(
result =>
{
if (result.Status == TaskStatus.RanToCompletion)
{
Console.WriteLine($"**ElasticSearchNotifer::Handle - CreateAsync {projection.Id} ");
_publisher.PublishAsync(Topics.ReadModelAcknowledged, projection);
}
else if (result.Status == TaskStatus.Faulted)
{
Console.WriteLine($"**ElasticSearchNotifer::Handle - CreateAsync {result.Exception?.GetBaseException().Message}");
}
}, cancellationToken);
}
}
public MockRepositorySpecification()
{
StreamNameBuilder = new PrefixedCamelCaseStreamNameBuilder();
StreamStoreConnection = new MockStreamStoreConnection("Test");
StreamStoreConnection.Connect();
EventSerializer = new JsonMessageSerializer();
MockRepository = new StreamStoreRepository(StreamNameBuilder, StreamStoreConnection, EventSerializer);
var connectorBus = new InMemoryBus("connector");
StreamStoreConnection.SubscribeToAll(evt => {
if (evt is ProjectedEvent)
{
return;
}
connectorBus.Publish((IMessage)EventSerializer.Deserialize(evt));
});
RepositoryEvents = new TestQueue(connectorBus, new[] { typeof(Event) });
}
Task OnEventReceived(string eventName, byte[] @event)
{
if (SubscriptionsManager.IsEmpty)
{
return(Task.CompletedTask);
}
var eventType = _eventNameTypeResolver.GetEventType(eventName);
var eo = _eventSerializer.Deserialize(eventType, @event);
var handlers = SubscriptionsManager.GetHandlers(eventType, _serviceProvider);
if (handlers == null)
{
return(Task.CompletedTask);
}
return(_eventReceiver.Invoke(eventType, eo, handlers));
}
Event Deserialize(ResolvedEvent @event, IEventSerializer serializer) {
var e = serializer.Deserialize(
new EventData(
@event.OriginalEvent.EventId, @event.OriginalEvent.EventType,
false, @event.OriginalEvent.Data,
@event.OriginalEvent.Metadata));
e.Version = @event.Event.EventNumber;
return e;
}
