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);
}
public async Task ShouldProjectImported()
{
var evt = DomainFixture.CreateImportBooking();
var stream = StreamName.For <Booking>(evt.BookingId);
var append = await Instance.EventStore.AppendEvents(
stream,
ExpectedStreamVersion.Any,
new[] {
new StreamEvent(Guid.NewGuid(), evt, new Metadata(), "application/json", 0)
},
CancellationToken.None
);
await Task.Delay(500);
var expected = new BookingDocument(evt.BookingId)
{
RoomId = evt.RoomId,
CheckInDate = evt.CheckIn,
CheckOutDate = evt.CheckOut,
Position = append.GlobalPosition
};
var actual = await Instance.Mongo.LoadDocument <BookingDocument>(evt.BookingId);
actual.Should().Be(expected);
}
public async Task read_snapshot_when_loading_aggregate()
{
var now = DateTime.UtcNow;
var esStore = new EsEventStore(GetEventStoreClient(), "snapshot_test");
var esAggregateStore = new EsAggregateStore(esStore, 5);
var aggregate = new Day();
var slots = new List <ScheduledSlot>
{
new ScheduledSlot(TimeSpan.FromMinutes(10), now),
new ScheduledSlot(TimeSpan.FromMinutes(10), now.AddMinutes(10)),
new ScheduledSlot(TimeSpan.FromMinutes(10), now.AddMinutes(20)),
new ScheduledSlot(TimeSpan.FromMinutes(10), now.AddMinutes(30)),
new ScheduledSlot(TimeSpan.FromMinutes(10), now.AddMinutes(40))
};
aggregate.Schedule(new DoctorId(Guid.NewGuid()), DateTime.UtcNow, slots, Guid.NewGuid);
await esAggregateStore.Save(aggregate,
new CommandMetadata(new CorrelationId(Guid.NewGuid()), new CausationId(Guid.NewGuid())));
await esStore.TruncateStream(StreamName.For <Day>(aggregate.Id), Convert.ToUInt64(aggregate.GetChanges().Count()));
var reloadedAggregate = await esAggregateStore.Load <Day>(aggregate.Id);
Assert.Equal(5, reloadedAggregate.Version);
}
public async Task write_snapshot_if_threshold_reached()
{
var now = DateTime.UtcNow;
var esStore = new EsEventStore(GetEventStoreClient(), "snapshot_test");
var esAggregateStore = new EsAggregateStore(esStore, 5);
var aggregate = new Day();
var slots = new List <ScheduledSlot>
{
new ScheduledSlot(TimeSpan.FromMinutes(10), now),
new ScheduledSlot(TimeSpan.FromMinutes(10), now.AddMinutes(10)),
new ScheduledSlot(TimeSpan.FromMinutes(10), now.AddMinutes(20)),
new ScheduledSlot(TimeSpan.FromMinutes(10), now.AddMinutes(30)),
new ScheduledSlot(TimeSpan.FromMinutes(10), now.AddMinutes(40))
};
aggregate.Schedule(new DoctorId(Guid.NewGuid()), DateTime.UtcNow, slots, Guid.NewGuid);
await esAggregateStore.Save(aggregate,
new CommandMetadata(new CorrelationId(Guid.NewGuid()), new CausationId(Guid.NewGuid())));
var snapshotEnvelope = await esStore.LoadSnapshot(StreamName.For <Day>(aggregate.Id));
var snapshot = snapshotEnvelope?.Snapshot as DaySnapshot;
Assert.NotNull(snapshot);
}
public async Task <T> Load <T>(string id, CancellationToken cancellationToken) 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, cancellationToken).Ignore();
}
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);
}
}
public async Task MapEnrichedCommand()
{
var store = new InMemoryEventStore();
var app = new WebApplicationFactory <Program>()
.WithWebHostBuilder(
builder => builder.ConfigureServices(services => services.AddAggregateStore(_ => store))
);
var httpClient = app.CreateClient();
using var client = new RestClient(httpClient, disposeHttpClient: true).UseSerializer(
() => new SystemTextJsonSerializer(
new JsonSerializerOptions(JsonSerializerDefaults.Web).ConfigureForNodaTime(DateTimeZoneProviders.Tzdb)
)
);
var cmd = new BookRoom(
"123",
"123",
LocalDate.FromDateTime(DateTime.Now),
LocalDate.FromDateTime(DateTime.Now.AddDays(1)),
100
);
var response = await client.PostJsonAsync("/book", cmd);
response.Should().Be(HttpStatusCode.OK);
var storedEvents = await store.ReadEvents(
StreamName.For <Booking>(cmd.BookingId),
StreamReadPosition.Start,
100,
default
);
var actual = storedEvents.FirstOrDefault();
actual.Should().NotBeNull();
actual !.Payload.Should()
.BeEquivalentTo(
new BookingEvents.RoomBooked(
cmd.BookingId,
cmd.RoomId,
cmd.CheckIn,
cmd.CheckOut,
cmd.Price,
TestData.GuestId
)
);
}
public async Task Store <T>(T aggregate)
where T : Aggregate
{
Ensure.NotNull(aggregate, nameof(aggregate));
if (aggregate.Changes.Count == 0)
{
return;
}
var stream = StreamName.For <T>(aggregate.GetId());
var expectedVersion = new ExpectedStreamVersion(aggregate.OriginalVersion);
await _eventStore.AppendEvents(stream, expectedVersion, aggregate.Changes.Select(ToStreamEvent).ToArray());
StreamEvent ToStreamEvent(object evt)
=> new(TypeMap.GetTypeName(evt), _serializer.Serialize(evt), null, _serializer.ContentType);
}
public DayArchiverProcessManager(
IColdStorage coldStorage,
IArchivableDaysRepository archivableDaysRepository,
ICommandStore commandStore,
TimeSpan threshold,
IEventStore eventStore,
Func <Guid> idGenerator
)
{
_commandStore = commandStore;
_idGenerator = idGenerator;
When <DayScheduled>(async(e, m) =>
{
await archivableDaysRepository.Add(new ArchivableDay(e.DayId, e.Date));
});
When <CalendarDayStarted>(async(e, m) =>
{
var archivableDays = await archivableDaysRepository.FindAll(e.Date.Add(threshold));
foreach (var day in archivableDays)
{
await SendCommand(day.Id, m.CorrelationId, m.CausationId);
}
});
When <DayScheduleArchived>(async(e, m) =>
{
var streamName = StreamName.For <Day>(e.DayId);
var events = await eventStore.LoadEvents(streamName);
coldStorage.SaveAll(events);
var lastVersion = await eventStore.GetLastVersion(streamName);
if (lastVersion.HasValue)
{
await eventStore.TruncateStream(streamName, lastVersion.Value);
}
});
}
public async Task Store <T>(T aggregate)
where T : Aggregate
{
if (aggregate == null)
{
throw new ArgumentNullException(nameof(aggregate));
}
if (aggregate.Changes.Count == 0)
{
return;
}
var stream = StreamName.For <T>(aggregate.GetId());
var expectedVersion = new ExpectedStreamVersion(aggregate.Version);
await _eventStore.AppendEvents(stream, expectedVersion, aggregate.Changes.Select(ToStreamEvent).ToArray());
JsonStreamEvent ToStreamEvent(object evt)
=> new(TypeMap.GetTypeName(evt), _serializer.Serialize(evt));
}
public async Task StoreInitial()
{
var cmd = new Commands.BookRoom(
Auto.Create <string>(),
Auto.Create <string>(),
LocalDate.FromDateTime(DateTime.Today),
LocalDate.FromDateTime(DateTime.Today.AddDays(2)),
Auto.Create <decimal>()
);
var expected = new Change[] {
new(
new BookingEvents.RoomBooked(
cmd.BookingId,
cmd.RoomId,
cmd.CheckIn,
cmd.CheckOut,
cmd.Price
),
"RoomBooked"
)
};
var result = await Service.Handle(cmd, default);
result.Success.Should().BeTrue();
result.Changes.Should().BeEquivalentTo(expected);
var evt = await EventStore.ReadEvents(
StreamName.For <Booking>(cmd.BookingId),
StreamReadPosition.Start,
1,
CancellationToken.None
);
evt[0].Payload.Should().BeEquivalentTo(result.Changes !.First().Event);
}
public async Task StreamSubscriptionGetsDeletedEvents()
{
var service = new BookingService(Instance.AggregateStore);
var categoryStream = new StreamName("$ce-Booking");
ulong?startPosition = null;
try {
var last = await Instance.Client.ReadStreamAsync(
Direction.Backwards,
categoryStream,
StreamPosition.End,
1
).ToArrayAsync();
startPosition = last[0].OriginalEventNumber;
}
catch (StreamNotFound) { }
const int produceCount = 20;
const int deleteCount = 5;
var commands = Enumerable.Range(0, produceCount)
.Select(_ => DomainFixture.CreateImportBooking())
.ToArray();
await Task.WhenAll(
commands.Select(x => service.Handle(x, CancellationToken.None))
);
var delete = Enumerable.Range(5, deleteCount).Select(x => commands[x]).ToList();
await Task.WhenAll(
delete
.Select(
x => Instance.EventStore.DeleteStream(
StreamName.For <Booking>(x.BookingId),
ExpectedStreamVersion.Any,
CancellationToken.None
)
)
);
var handler = new TestHandler();
const string subscriptionId = "TestSub";
var subscription = new StreamSubscription(
Instance.Client,
new StreamSubscriptionOptions {
StreamName = categoryStream,
SubscriptionId = subscriptionId,
ResolveLinkTos = true,
ThrowOnError = true
},
new NoOpCheckpointStore(startPosition),
new ConsumePipe()
.AddFilterLast(new MessageFilter(x => !x.MessageType.StartsWith("$")))
.AddDefaultConsumer(handler)
);
var log = _loggerFactory.CreateLogger("Test");
await subscription.SubscribeWithLog(log);
var cts = new CancellationTokenSource(TimeSpan.FromSeconds(200));
while (handler.Count < produceCount - deleteCount && !cts.IsCancellationRequested)
{
await Task.Delay(100);
}
await subscription.UnsubscribeWithLog(log);
log.LogInformation("Received {Count} events", handler.Count);
var actual = handler.Processed
.Select(x => (x.Message as BookingEvents.BookingImported) !.BookingId)
.ToList();
log.LogInformation("Actual contains {Count} events", actual.Count);
actual
.Should()
.BeEquivalentTo(commands.Except(delete).Select(x => x.BookingId));
}