public async Task SubscribeToStream(string name, params SubscriptionInfo[] eventTypes)
{
var methods = new Dictionary <string, Func <IStreamSubscription, ResolvedEvent, CancellationToken, Task> >();
var handlers = eventTypes.ToDictionary(x => x.EventType.Name, x => x.HandlerType);
var dict = eventTypes.Select(x => x.EventType).ToDictionary(x => x.Name);
await _connection.SubscribeToStreamAsync(name, StreamRevision.Start, async (s, r, c) =>
{
await OnEventAppearead(s, r, methods, handlers, dict, c);
}, null, true, OnDropped);
}
public async Task Subscribe(IEventStoreFacade connection)
{
_connection = connection;
_lastCheckpoint = await _checkpointRepo.GetLastCheckpoint();
this.Subscription = await _connection.SubscribeToStreamAsync(_streamName,
new StreamRevision(_lastCheckpoint ?? 0L),
OnEventAppeared,
OnLiveProcessingStarted,
true,
OnSubscriptionDropped);
}
public async Task Configure(IEventStoreFacade connection, IEventHandlerDispatcher dispatcher, Serilog.ILogger logger)
{
_logger = logger;
_logger.Information("Subscribed for {eventName} for local projections. (with EventDispatcher)", typeof(TEvent).Name);
var stream = $"$et-{typeof(TEvent).Name}";
this._dispatcher = dispatcher;
// Should we wait for the subscription? - or should we re-subscribe
await connection.SubscribeToStreamAsync(stream, OnReadEvent, true);
}
public async Task Configure(IEventStoreFacade connection,
IEventConverter eventConverter,
IHubContext <EventStoreHub> hubConnection, Serilog.ILogger logger)
{
Log = logger;
_converter = eventConverter;
var stream = $"$et-{typeof(TEvent).Name}";
this._connection = hubConnection;
var t = await connection.SubscribeToStreamAsync(stream, StreamRevision.Start, OnReadEvent, null, true);
Log.Information("Subscribed for {eventName} for pushing to signalR clients.", typeof(TEvent).Name);
}
public async Task <ISubscription> Subscribe(IEventHandlerFactory factory, object[] args = null)
{
if (!factory.SupportedEventTypes.Contains <TEvent>())
{
throw new InvalidOperationException(
$"Event Handler Factory seems not to support this Event. {typeof(TEvent).Name}");
}
// uhhh and we need to know from when...
Type checkpointRepo = typeof(ICheckpointRepository <,>).MakeGenericType(_schema.Type, typeof(TEvent));
var repo = (ICheckpointEventRepository <TEvent>)_serviceProvider.GetService(checkpointRepo);
string streamName = $"$et-{typeof(TEvent).Name}";
var lastCheckpoint = await repo.GetLastCheckpoint();
StreamRevision start = StreamRevision.Start;
if (!lastCheckpoint.HasValue)
{
// this is the first time we run this processor.
var(globalPosition, streamRevision) = await _eventStore.GetLastStreamPosition(streamName);
start = streamRevision;
await repo.SaveCheckpoint(start.ToUInt64());
}
else
{
start = new StreamRevision(lastCheckpoint.Value + 1);
}
Subscription s = new Subscription();
await _eventStore.SubscribeToStreamAsync(streamName, start,
async (s, r, c) =>
{
using (var scope = factory.Scope())
{
var handler = scope.CreateHandler <TEvent>();
var(m, e) = _eventConverter.Convert <TEvent>(r);
await handler.Execute(m, e);
await repo.SaveCheckpoint(r.Link.EventNumber.ToUInt64());
}
}, ss => s.MakeLive(), true);
return(s);
}
public async Task <ISubscription> Subscribe(IEventHandlerFactory factory, object[] args = null)
{
Subscription s = new Subscription();
if (!factory.SupportedEventTypes.Contains <TEvent>())
{
throw new InvalidOperationException($"Event Handler Factory seems not to support this Event. {typeof(TEvent).Name}");
}
// Projections stream type might not be the same as origin of the event.
// For instance Stream might go directly to memory, where as some events
// come from EventStore
// In such a case, we could assume to subscribe from the beginning
// or we could assume that we want to subscribe from now.
// For now we subscribe from beginning - however this is a problem.
// We don't know the nature of this subscription - if it is temporal or not.
// If it had been temporal, we would subscribe from now
// It it had not been temporal, we would subscribe from beginning
var position = await Stream.LastPosition();
StreamRevision sr = StreamRevision.Start;
if (position is StreamPosition lastPosition)
{
sr = lastPosition.IsStart ? StreamRevision.Start : new StreamRevision(lastPosition.StreamRevision + 1);
}
await _eventStore.SubscribeToStreamAsync(STREAM_NAME, sr, async (s, r, c) =>
{
using (var scope = factory.Scope())
{
var handler = scope.CreateHandler <TEvent>();
var(m, e) = _eventConverter.Convert <TEvent>(r);
await handler.Execute(m, e);
}
}, ss => s.MakeLive(), true);
return(s);
}
