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Publish a C# event when the InMemory event stream is appended to #7

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113 changes: 112 additions & 1 deletion SimpleEventStore.Tests/InMemory/InMemoryEventStoreAppending.cs
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Original file line number Diff line number Diff line change
@@ -1,15 +1,126 @@
using System;
using System.Linq;
using System.Threading.Tasks;
using NUnit.Framework;
using SimpleEventStore.InMemory;
using SimpleEventStore.Tests.Events;

namespace SimpleEventStore.Tests.InMemory
{
[TestFixture]
public class InMemoryEventStoreAppending : EventStoreAppending
{
private InMemoryEventStreamChanged lastReceivedInMemoryEventStreamChangedEvent;
private readonly TestMetadata metadata = new TestMetadata { Value = "Hello" };

protected override Task<IStorageEngine> CreateStorageEngine()
{
return Task.FromResult((IStorageEngine)new InMemoryStorageEngine());
var storageEngine = new InMemoryStorageEngine();
storageEngine.OnStreamChanged += StorageEngineOnStreamChanged;
return Task.FromResult((IStorageEngine)storageEngine);
}

private void StorageEngineOnStreamChanged(object sender, InMemoryEventStreamChanged e)
{
lastReceivedInMemoryEventStreamChangedEvent = e;
}

[Test]
public async Task WhenAppendingToANewStreamAStreamChangedEventIsPublished()
{
var streamId = Guid.NewGuid().ToString();
var subject = await GetEventStore();
var @event = new EventData(Guid.NewGuid(), new OrderCreated(streamId), metadata);

await subject.AppendToStream(streamId, 0, @event);

Assert.IsNotNull(lastReceivedInMemoryEventStreamChangedEvent);
Assert.AreEqual(1, lastReceivedInMemoryEventStreamChangedEvent.NewEvents.Count);

var newEvent = lastReceivedInMemoryEventStreamChangedEvent.NewEvents.Single();
Assert.AreEqual(@event.EventId, newEvent.EventId);
Assert.AreEqual(@event.Body, newEvent.EventBody);
Assert.AreEqual(@event.Metadata, newEvent.Metadata);
Assert.AreEqual(1, newEvent.EventNumber);
}

[Test]
public async Task WhenAppendingToAnExistingStreamAStreamChangedEventIsPublished()
{
var streamId = Guid.NewGuid().ToString();
var subject = await GetEventStore();
await subject.AppendToStream(streamId, 0, new EventData(Guid.NewGuid(), new OrderCreated(streamId), metadata));
var @event = new EventData(Guid.NewGuid(), new OrderDispatched(streamId), metadata);

await subject.AppendToStream(streamId, 1, @event);

Assert.IsNotNull(lastReceivedInMemoryEventStreamChangedEvent);
Assert.AreEqual(1, lastReceivedInMemoryEventStreamChangedEvent.NewEvents.Count);

var newEvent = lastReceivedInMemoryEventStreamChangedEvent.NewEvents.Single();
Assert.AreEqual(@event.EventId, newEvent.EventId);
Assert.AreEqual(@event.Body, newEvent.EventBody);
Assert.AreEqual(@event.Metadata, newEvent.Metadata);
Assert.AreEqual(2, newEvent.EventNumber);
}

[Test]
public async Task WhenAppendingToANewStreamWithMultipleEventsAStreamChangedEventIsPublished()
{
var streamId = Guid.NewGuid().ToString();
var subject = await GetEventStore();
var events = new[]
{
new EventData(Guid.NewGuid(), new OrderCreated(streamId), metadata),
new EventData(Guid.NewGuid(), new OrderDispatched(streamId), metadata)
};

await subject.AppendToStream(streamId, 0, events);

Assert.IsNotNull(lastReceivedInMemoryEventStreamChangedEvent);
Assert.AreEqual(2, lastReceivedInMemoryEventStreamChangedEvent.NewEvents.Count);

var firstNewEvent = lastReceivedInMemoryEventStreamChangedEvent.NewEvents.First();
Assert.AreEqual(events[0].EventId, firstNewEvent.EventId);
Assert.AreEqual(events[0].Body, firstNewEvent.EventBody);
Assert.AreEqual(events[0].Metadata, firstNewEvent.Metadata);
Assert.AreEqual(1, firstNewEvent.EventNumber);

var lastNewEvent = lastReceivedInMemoryEventStreamChangedEvent.NewEvents.Last();
Assert.AreEqual(events[1].EventId, lastNewEvent.EventId);
Assert.AreEqual(events[1].Body, lastNewEvent.EventBody);
Assert.AreEqual(events[1].Metadata, lastNewEvent.Metadata);
Assert.AreEqual(2, lastNewEvent.EventNumber);
}

[Test]
public async Task WhenAppendingToAnExistingStreamWithMultipleEventsAStreamChangedEventIsPublished()
{
var streamId = Guid.NewGuid().ToString();
var subject = await GetEventStore();
await subject.AppendToStream(streamId, 0, new EventData(Guid.NewGuid(), new OrderCreated(streamId), metadata));
var events = new[]
{
new EventData(Guid.NewGuid(), new OrderCreated(streamId), metadata),
new EventData(Guid.NewGuid(), new OrderDispatched(streamId), metadata)
};

await subject.AppendToStream(streamId, 1, events);

Assert.IsNotNull(lastReceivedInMemoryEventStreamChangedEvent);
Assert.AreEqual(2, lastReceivedInMemoryEventStreamChangedEvent.NewEvents.Count);

var firstNewEvent = lastReceivedInMemoryEventStreamChangedEvent.NewEvents.First();
Assert.AreEqual(events[0].EventId, firstNewEvent.EventId);
Assert.AreEqual(events[0].Body, firstNewEvent.EventBody);
Assert.AreEqual(events[0].Metadata, firstNewEvent.Metadata);
Assert.AreEqual(2, firstNewEvent.EventNumber);

var lastNewEvent = lastReceivedInMemoryEventStreamChangedEvent.NewEvents.Last();
Assert.AreEqual(events[1].EventId, lastNewEvent.EventId);
Assert.AreEqual(events[1].Body, lastNewEvent.EventBody);
Assert.AreEqual(events[1].Metadata, lastNewEvent.Metadata);
Assert.AreEqual(3, lastNewEvent.EventNumber);
}
}
}
15 changes: 15 additions & 0 deletions SimpleEventStore/InMemory/InMemoryEventStreamChanged.cs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,15 @@
using System;
using System.Collections.Generic;

namespace SimpleEventStore.InMemory
{
public class InMemoryEventStreamChanged : EventArgs
{
public InMemoryEventStreamChanged(IReadOnlyList<StorageEvent> newEvents)
{
NewEvents = newEvents;
}

public IReadOnlyList<StorageEvent> NewEvents { get; }
}
}
13 changes: 12 additions & 1 deletion SimpleEventStore/InMemory/InMemoryStorageEngine.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,8 @@ public class InMemoryStorageEngine : IStorageEngine
private readonly ConcurrentDictionary<string, List<StorageEvent>> streams = new ConcurrentDictionary<string, List<StorageEvent>>();
private readonly List<StorageEvent> allEvents = new List<StorageEvent>();

public event EventHandler<InMemoryEventStreamChanged> OnStreamChanged;

public Task AppendToStream(string streamId, IEnumerable<StorageEvent> events)
{
return Task.Run(() =>
Expand Down Expand Up @@ -46,7 +48,7 @@ public Task DeleteStream(string streamId)
allEvents.Remove(@event);
}

streams.TryRemove(streamId, out var removedStream);
streams.TryRemove(streamId, out _);

return Task.CompletedTask;
}
Expand All @@ -57,6 +59,15 @@ private void AddEventsToAllStream(IEnumerable<StorageEvent> events)
{
allEvents.Add(e);
}

var handler = OnStreamChanged;

if (handler is null)
{
return;
}

handler(this, new InMemoryEventStreamChanged(new List<StorageEvent>(events).AsReadOnly()));
}

public Task<IReadOnlyCollection<StorageEvent>> ReadStreamForwards(string streamId, int startPosition, int numberOfEventsToRead)
Expand Down