void Enqueue(PersistenceRequest request)
{
_buffer.AddLast(new BufferEntry { Request = request, Sender = Sender });
if (!_flushRequested)
{
Self.Tell(new FlushBufferCommand(), Self);
_flushRequested = true;
}
}
void Ready()
{
SetReceiveTimeout(_options.CommandProcessorIdleTimeout);
Receive<ProcessorCommand>(async c =>
{
// ensure the timeout hasn't expired
if (c.Timeout.IsExpired)
{
Sender.Tell(new CommandTimeout(c.CommandID));
return;
}
try
{
await Validate(c.Command);
await _commandHandlers.Handle(c.Command);
}
// handle command rejections
catch (RejectException ex)
{
Sender.Tell(new CommandRejected(c.CommandID, ex.Reasons));
return;
}
// handle unexpected exceptions
catch (Exception ex)
{
Sender.Tell(new CommandFailed(c.CommandID, ex));
return;
}
if (_unpersistedEvents.Count > 0)
{
var request = new PersistenceRequest(_unpersistedEvents.ToList());
// command processors don't need to wait for persistence, so
// we delegate it to a worker and move on to wait for new commands
// the worker will wait for responses and notify the sender
var props = PersistenceWorker.CreateProps(request.PersistenceID, c.CommandID, Sender, _options.CommandProcessorPersistenceTimeout);
var worker = Context.ActorOf(props);
// send the request on behalf of the worker and let it wait for responses
_writer.Tell(request, worker);
// clear the unpersisted events
_unpersistedEvents.Clear();
}
});
Receive<ReceiveTimeout>(_ => StopSelf());
}
public void Writer_tells_persistedevents_to_dispatcher_in_order()
{
var dispatcher = CreateTestProbe();
var writer = CreateWriter(writer: MockEventStore.SuccessfulWriter(), dispatcher: dispatcher);
var request = new PersistenceRequest(new[] {
new UnpersistedEvent("a", new SampleEvent3()),
new UnpersistedEvent("a", new SampleEvent1()),
new UnpersistedEvent("a", new SampleEvent2())
});
writer.Tell(request);
dispatcher.ExpectMsg<IPersistedEvent<SampleEvent3>>();
dispatcher.ExpectMsg<IPersistedEvent<SampleEvent1>>();
dispatcher.ExpectMsg<IPersistedEvent<SampleEvent2>>();
dispatcher.ExpectNoMsg(50);
}
private async Task HandleRequest(PersistenceRequest request)
{
try
{
await WriteEvents(request);
Sender.Tell(new PersistenceSuccess(request.PersistenceID));
}
catch (UnexpectedStreamSequenceException)
{
Sender.Tell(new UnexpectedStreamSequence(request.PersistenceID));
}
catch (DuplicatedEntryException)
{
Sender.Tell(new DuplicatedEntry(request.PersistenceID));
}
catch (Exception ex)
{
Sender.Tell(new PersistenceFailure(request.PersistenceID, ex));
}
}
protected async Task WriteEvents(PersistenceRequest request)
{
var events = request.Events;
// serialize the events into raw events
var rawEvents = UnpersistedRawEvent.FromUnpersistedEvents(events, _serializer);
// writes all events to the store
await _writer.WriteStreamAsync(request.Stream, request.ExpectedStreamSequence, rawEvents);
// publishes the events in the order they were sent
for (int i = 0, len = events.Count; i < len; i++) {
var e = events[i];
var re = rawEvents[i];
var persistedEvent = PersistedEventFactory.FromUnpersistedEvent(re.GlobalSequence, e);
// publish to the event stream
_dispatcher.Tell(persistedEvent);
}
}
public void Writer_does_not_publish_to_event_stream()
{
var dispatcher = CreateTestProbe();
var writer = CreateWriter(writer: MockEventStore.SuccessfulWriter(), dispatcher: dispatcher);
var request = new PersistenceRequest(new[] {
new UnpersistedEvent("a", new SampleEvent3()),
new UnpersistedEvent("a", new SampleEvent1()),
new UnpersistedEvent("a", new SampleEvent2())
});
var probe = CreateTestProbe();
Sys.EventStream.Subscribe(probe, typeof(IPersistedEvent));
writer.Tell(request);
probe.ExpectNoMsg(TimeSpan.FromMilliseconds(500));
}