public async Task If_Subscribe_is_called_more_than_once_for_a_given_handler_it_is_not_subscribed_again()
{
var callCount = 0;
var handler = Projector.Create <Order.ItemAdded>(e => { callCount++; });
var bus = new InProcessEventBus();
bus.Subscribe(handler);
bus.Subscribe(handler);
await bus.PublishAsync(new Order.ItemAdded());
callCount.Should().Be(1);
}
public void Durable_consequenters_can_be_simulated_for_unit_testing_and_receive_messages()
{
var consequenter1WasCalled = false;
var consequenter2WasCalled = false;
var uselessSettings = new ServiceBusSettings();
using (ServiceBusDurabilityExtensions.Simulate())
{
var consequenter1 = Consequenter.Create <Order.Cancelled>(
e => { consequenter1WasCalled = true; });
var consequenter2 = Consequenter.Create <Order.CreditCardCharged>(
e => { consequenter2WasCalled = true; });
var bus = new InProcessEventBus();
bus.Subscribe(
consequenter1.UseServiceBusForDurability(uselessSettings),
consequenter2.UseServiceBusForDurability(uselessSettings));
bus.PublishAsync(new Order.Cancelled()).Wait();
consequenter1WasCalled.Should().BeTrue();
consequenter2WasCalled.Should().BeFalse();
}
}
public void When_multiple_consequenter_handlers_are_chained_then_the_last_added_is_called_first()
{
// arrange
var bus = new InProcessEventBus();
var handlerCalls = new List <string>();
// act
var handler = new TestConsequenter()
.WrapAll((e, next) =>
{
handlerCalls.Add("c");
next(e);
})
.WrapAll((e, next) =>
{
handlerCalls.Add("b");
next(e);
})
.WrapAll((e, next) =>
{
handlerCalls.Add("a");
next(e);
});
bus.Subscribe(handler);
bus.PublishAsync(new Order.Created()).Wait();
// assert
handlerCalls.Should().BeInAscendingOrder();
}
public void Handler_chains_can_be_specified_for_all_event_types_on_a_single_projector()
{
// arrange
var bus = new InProcessEventBus();
var createdWasCalled = false;
var cancelledWasCalled = false;
var deliveredWasCalled = false;
var handledEvents = new List <IEvent>();
// act
var handler = new TestProjector(
onCreated: e => createdWasCalled = true,
onCancelled: e => cancelledWasCalled = true,
onDelivered: e => deliveredWasCalled = true)
.WrapAll((e, nextHandler) =>
{
handledEvents.Add(e);
nextHandler(e);
});
bus.Subscribe(handler);
bus.PublishAsync(new Order.Created()).Wait();
bus.PublishAsync(new Order.Cancelled()).Wait();
bus.PublishAsync(new Order.Delivered()).Wait();
// assert
handledEvents.Count.Should().Be(3);
createdWasCalled.Should().BeTrue("created was called");
cancelledWasCalled.Should().BeTrue("cancelled was called");
deliveredWasCalled.Should().BeTrue("delivered was called");
}
public async Task When_a_handler_chain_throws_then_subsequent_events_are_still_published()
{
// arrange
var bus = new InProcessEventBus();
var errors = new List <EventHandlingError>();
bus.Errors.Subscribe(errors.Add);
var callCount = 0;
// act
var handler = new TestConsequenter()
.WrapAll((e, next) =>
{
callCount++;
if (callCount == 1)
{
throw new Exception("oops!");
}
});
bus.Subscribe(handler);
await bus.PublishAsync(new Order.Created());
await bus.PublishAsync(new Order.Created());
// assert
callCount.Should().Be(2);
}
public async Task When_one_command_triggers_another_command_via_a_consequenter_then_the_second_command_acquires_the_first_commands_clock()
{
// arrange
var orderId = Any.Guid();
var customerId = Any.Guid();
var bus = new InProcessEventBus();
var orderRepository = new InMemoryEventSourcedRepository <Order>(bus: bus);
await orderRepository.Save(new Order(new CreateOrder(Any.FullName())
{
AggregateId = orderId,
CustomerId = customerId
}).Apply(new AddItem
{
ProductName = Any.Word(),
Quantity = 1,
Price = Any.Decimal(.01m, 10m)
}));
var customerRepository = new InMemoryEventSourcedRepository <CustomerAccount>();
await customerRepository.Save(new CustomerAccount(customerId).Apply(new ChangeEmailAddress(Any.Email())));
#pragma warning disable 618
bus.Subscribe(Consequenter.Create <Order.Shipped>(e =>
#pragma warning restore 618
{
var order = orderRepository.GetLatest(e.AggregateId).Result;
var customer = customerRepository.GetLatest(order.CustomerId).Result;
customer.Apply(new SendOrderConfirmationEmail(order.OrderNumber));
customerRepository.Save(customer).Wait();
}));
var shipDate = DateTimeOffset.Parse("2014-05-15 01:01:01");
var ship = new Ship();
// act
using (CommandContext.Establish(ship, Clock.Create(() => shipDate)))
{
var order = await orderRepository.GetLatest(orderId);
order.Apply(ship);
await orderRepository.Save(order);
}
// assert
var last = (await customerRepository.GetLatest(customerId)).Events().Last();
last.Should()
.BeOfType <CustomerAccount.OrderShipConfirmationEmailSent>();
last.Timestamp.Should().Be(shipDate);
}
private void IncludeReadModelsNeeding(StorableEvent storedEvent)
{
if (unsubscribedReadModelInfos.Count > 0)
{
foreach (var readmodelInfo in unsubscribedReadModelInfos.ToArray())
{
if (storedEvent.Id >= readmodelInfo.CurrentAsOfEventId + 1)
{
var handler = projectors.Single(p => ReadModelInfo.NameForProjector(p) == readmodelInfo.Name);
disposables.Add(bus.Subscribe(handler));
unsubscribedReadModelInfos.Remove(readmodelInfo);
subscribedReadModelInfos.Add(readmodelInfo);
}
}
}
}
public void PublishAndSubscribeEventTest()
{
InProcessEventBus bus = new InProcessEventBus();
TestEvent testEvent = new TestEvent("some value");
TestEvent receivedEvent = null;
bus.Subscribe(new Subscriber(eventEnvelope => receivedEvent = eventEnvelope.GetContent <TestEvent>()));
bus.Publish(testEvent);
// sleep because the bus publishes events on another thread
Thread.Sleep(10);
receivedEvent.Should().NotBeNull();
receivedEvent.ShouldBeEquivalentTo(testEvent);
}
public void When_a_consequenter_that_has_been_chained_throws_then_the_EventHandlingError_Handler_references_the_inner_handler()
{
// arrange
var bus = new InProcessEventBus();
var errors = new List <EventHandlingError>();
bus.Errors.Subscribe(errors.Add);
// act
var handler = new TestConsequenter(onCreated: e => { throw new Exception("oops!"); });
bus.Subscribe(handler);
bus.PublishAsync(new Order.Created()).Wait();
// assert
errors.Should().ContainSingle(e => e.Handler is TestConsequenter);
}
public void InMemoryCommandScheduler_executes_scheduled_commands_immediately_if_no_due_time_is_specified()
{
// arrange
var bus = new InProcessEventBus();
var repository = new InMemoryEventSourcedRepository <Order>(bus: bus);
var scheduler = new InMemoryCommandScheduler <Order>(repository);
bus.Subscribe(scheduler);
var order = CreateOrder();
// act
order.Apply(new ShipOn(Clock.Now().Subtract(TimeSpan.FromDays(2))));
repository.Save(order);
//assert
order = repository.GetLatest(order.Id);
var lastEvent = order.Events().Last();
lastEvent.Should().BeOfType <Order.Shipped>();
}
public void When_a_handler_chain_throws_then_an_EventHandlingError_is_published()
{
// arrange
var bus = new InProcessEventBus();
var errors = new List <EventHandlingError>();
bus.Errors.Subscribe(errors.Add);
// act
var handler = new TestConsequenter()
.WrapAll((e, next) => { throw new Exception("oops!"); });
bus.Subscribe(handler);
bus.PublishAsync(new Order.Created()).Wait();
// assert
errors.Should().ContainSingle(e => e.StreamName == "Order" &&
e.Event.EventName() == "Created" &&
e.Exception.Message.Contains("oops!"));
}
public void Consequenter_can_be_short_circuited_using_handler_chains()
{
// arrange
var bus = new InProcessEventBus();
var consequenterWasCalled = false;
var handlerCalls = 0;
// act
var handler = new TestConsequenter(onCreated: e => consequenterWasCalled = true)
.WrapAll((e, next) =>
{
handlerCalls++;
// by not calling next, we short circuit the call to the remaining handler chain
});
bus.Subscribe(handler);
bus.PublishAsync(new Order.Created()).Wait();
// assert
handlerCalls.Should().Be(1);
consequenterWasCalled.Should().BeFalse();
}
public async Task When_one_command_triggers_another_command_via_a_consequenter_then_the_second_command_acquires_the_first_commands_clock()
{
// arrange
var orderId = Any.Guid();
var customerId = Any.Guid();
var bus = new InProcessEventBus();
var orderRepository = new InMemoryEventSourcedRepository<Order>(bus: bus);
await orderRepository.Save(new Order(new CreateOrder(Any.FullName())
{
AggregateId = orderId,
CustomerId = customerId
}).Apply(new AddItem
{
ProductName = Any.Word(),
Quantity = 1,
Price = Any.Decimal(.01m, 10m)
}));
var customerRepository = new InMemoryEventSourcedRepository<CustomerAccount>();
await customerRepository.Save(new CustomerAccount(customerId).Apply(new ChangeEmailAddress(Any.Email())));
bus.Subscribe(Consequenter.Create<Order.Shipped>(e =>
{
var order = orderRepository.GetLatest(e.AggregateId).Result;
var customer = customerRepository.GetLatest(order.CustomerId).Result;
customer.Apply(new SendOrderConfirmationEmail(order.OrderNumber));
customerRepository.Save(customer).Wait();
}));
var shipDate = DateTimeOffset.Parse("2014-05-15 01:01:01");
var ship = new Ship();
// act
using (CommandContext.Establish(ship, Clock.Create(() => shipDate)))
{
var order = await orderRepository.GetLatest(orderId);
order.Apply(ship);
await orderRepository.Save(order);
}
// assert
var last = (await customerRepository.GetLatest(customerId)).Events().Last();
last.Should()
.BeOfType<CustomerAccount.OrderShipConfirmationEmailSent>();
last.Timestamp.Should().Be(shipDate);
}
private long StreamEventsToProjections(ExclusiveEventStoreCatchupQuery query)
{
long eventsProcessed = 0;
foreach (var storedEvent in query.Events)
{
eventsProcessed++;
if (unsubscribedReadModelInfos.Count > 0)
{
foreach (var readmodelInfo in unsubscribedReadModelInfos.ToArray())
{
if (storedEvent.Id >= readmodelInfo.CurrentAsOfEventId + 1)
{
var handler = projectors.Single(p => ReadModelInfo.NameForProjector(p) == readmodelInfo.Name);
disposables.Add(bus.Subscribe(handler));
unsubscribedReadModelInfos.Remove(readmodelInfo);
subscribedReadModelInfos.Add(readmodelInfo);
}
}
}
if (cancellationDisposable.IsDisposed)
{
break;
}
IEvent @event = null;
var now = Clock.Now();
try
{
// update projectors
@event = storedEvent.ToDomainEvent();
if (@event != null)
{
using (var work = CreateUnitOfWork(@event))
{
bus.PublishAsync(@event).Wait();
var infos = work.Resource <DbContext>().Set <ReadModelInfo>();
subscribedReadModelInfos.ForEach(i =>
{
var eventsRemaining = query.ExpectedNumberOfEvents - eventsProcessed;
infos.Attach(i);
i.LastUpdated = now;
i.CurrentAsOfEventId = storedEvent.Id;
i.LatencyInMilliseconds = (now - @event.Timestamp).TotalMilliseconds;
i.BatchRemainingEvents = eventsRemaining;
if (eventsProcessed == 1)
{
i.BatchStartTime = now;
i.BatchTotalEvents = query.ExpectedNumberOfEvents;
}
if (i.InitialCatchupStartTime == null)
{
i.InitialCatchupStartTime = now;
i.InitialCatchupEvents = query.ExpectedNumberOfEvents;
}
if (eventsRemaining == 0 & i.InitialCatchupEndTime == null)
{
i.InitialCatchupEndTime = now;
}
});
work.VoteCommit();
}
}
else
{
throw new SerializationException(string.Format(
"Deserialization: Event type '{0}.{1}' not found",
storedEvent.StreamName,
storedEvent.Type));
}
}
catch (Exception ex)
{
var error = @event == null
? SerializationError(ex, storedEvent)
: new Domain.EventHandlingError(ex, @event: @event);
ReadModelUpdate.ReportFailure(
error,
() => CreateReadModelDbContext());
}
var status = new ReadModelCatchupStatus
{
BatchCount = query.ExpectedNumberOfEvents,
NumberOfEventsProcessed = eventsProcessed,
CurrentEventId = storedEvent.Id,
EventTimestamp = storedEvent.Timestamp,
StatusTimeStamp = now,
CatchupName = Name
};
if (status.IsEndOfBatch)
{
// reset the re-entrancy flag
running = 0;
query.Dispose();
}
ReportStatus(status);
}
return(eventsProcessed);
}
public async Task InMemoryCommandScheduler_executes_scheduled_commands_immediately_if_no_due_time_is_specified()
{
// arrange
var bus = new InProcessEventBus();
var repository = new InMemoryEventSourcedRepository<Order>(bus: bus);
var scheduler = new InMemoryCommandScheduler<Order>(repository);
bus.Subscribe(scheduler);
var order = CreateOrder();
// act
order.Apply(new ShipOn(Clock.Now().Subtract(TimeSpan.FromDays(2))));
await repository.Save(order);
await scheduler.Done();
//assert
order = await repository.GetLatest(order.Id);
var lastEvent = order.Events().Last();
lastEvent.Should().BeOfType<Order.Shipped>();
}