public IObservable <RecordedRawEvent> NewEvents(string stream_name, Subject <RecordedRawEvent> new_subject = null)
{
new_subject = new_subject ?? new Subject <RecordedRawEvent>();
connection.SubscribeToStreamAsync(stream_name, true,
(e, s) =>
{
var recorded_event = new RecordedRawEvent(new RawEvent(s.Event.EventId,
s.Event.Data,
s.Event.Metadata,
s.Event.EventType),
stream_name,
s.Event.EventNumber);
new_subject.OnNext(recorded_event);
},
(ess, dr, ex) =>
{
Console.WriteLine($"Subscription to {stream_name} dropped .. reconnecting");
NewEvents(stream_name, new_subject);
});
return(new_subject.AsObservable());
}
public void CommitAndPublish(RecordedRawEvent origin_event, IEnumerable <RawEvent> raw_events)
{
var log_payload = origin_event.ToPointer();
//events to publish
var events = raw_events.Select(payload => new EventData(payload.id, payload.type, true, payload.data, payload.metadata));
processed_request_ids.AddOrUpdate(origin_event.raw_event.id, default(byte), (g, b) => b);
//cleanup
byte remove; received_request_ids.TryRemove(origin_event.raw_event.id, out remove);
events =
events.Union(new EventData(Guid.NewGuid(),
$"{LoggedEventPointer}-{log_payload.stream_name}", //Todo: wrap this in a constant
true,
log_payload.ToBytes(),
new { processed_request_ids }.ToBytes())
.ToEnumerable());
//publish
connection
.AppendToStreamAsync(current_domain_stream,
ExpectedVersion.Any,
events)
.Wait();
}
private void handle(RecordedRawEvent recorded_event)
{
Console.WriteLine($"Received event with id: {recorded_event.raw_event.id}");
if (!router.is_route_handler_defined(recorded_event.raw_event.type))
{
Console.WriteLine($"No handler defined for event with id: {recorded_event.raw_event.id}");
return;
}
var request = new RawRequest <W>(recorded_event.raw_event.id,
recorded_event.raw_event.data.ToJsonString(),
recorded_event.raw_event.type,
router.get_handler(recorded_event.raw_event.type));
var responder_added = responders.TryAdd(recorded_event.raw_event.id, response => {
response
.core_response
.match(
is_success: events =>
{
var payload =
events.Select(ev => ev.ToRawEvent(response.raw_request.id));
//Potential data inconsistencies between removing above, and publishing below
event_store.CommitAndPublish(recorded_event, payload);
},
is_error: errors =>
{
var payload =
errors.Select(ev => ev.ToRawEvent(response.raw_request.id));
//Potential data inconsistencies between removing above, and publishing below
event_store.PublishErrors(recorded_event, payload);
}
);
Console.WriteLine($"Finished event with id: {response.raw_request.id}");
});
if (!responder_added)
{
throw new Exception("Responder could not be added");
}
requests.Add(request);
}
public void PublishErrors(RecordedRawEvent origin_event, IEnumerable <RawEvent> raw_events)
{
//Add to in-memory: will be made durable when the next request is persisted
processed_request_ids.AddOrUpdate(origin_event.raw_event.id, default(byte), (g, b) => b);
byte remove; received_request_ids.TryRemove(origin_event.raw_event.id, out remove);
var events = raw_events.Select(payload => new EventData(payload.id, payload.type, true, payload.data, payload.metadata));
connection
.AppendToStreamAsync($"{origin_event.origin_stream}-Errors",
ExpectedVersion.Any,
events)
.Wait();
}
public IObservable <RecordedRawEvent> AllUnprocessedEvents(string stream_name, Subject <RecordedRawEvent> allUnprocessedSubject = null)
{
allUnprocessedSubject = allUnprocessedSubject ?? new Subject <RecordedRawEvent>();
var settings = new CatchUpSubscriptionSettings(50, 10, true, true);
connection.SubscribeToStreamFrom(stream_name, StreamCheckpoint.StreamStart, settings,
(e, s) =>
{
if (!received_request_ids.ContainsKey(s.Event.EventId)
&&
!processed_request_ids.ContainsKey(s.Event.EventId)
&&
!s.Event.EventType.Contains(LoggedEventPointer))
{
received_request_ids.AddOrUpdate(s.Event.EventId, default(byte), (g, b) => b);
var recorded_event =
new RecordedRawEvent(new RawEvent(s.Event.EventId,
s.Event.Data,
s.Event.Metadata,
s.Event.EventType),
stream_name,
s.Event.EventNumber);
allUnprocessedSubject.OnNext(recorded_event);
}
}, null,
(ess, dr, ex) =>
{
Console.WriteLine($"Subscription to {stream_name} dropped .. reconnecting");
AllUnprocessedEvents(stream_name, allUnprocessedSubject);
});
return(allUnprocessedSubject.AsObservable());
}
