public void ApplyProjection(IProjection projection, EventStream eventStream)
{
UniRx.IObservable <IEvent> stream = null;
switch (eventStream)
{
case EventStream.AllExistingEvents:
stream = AllEventObservable; // Terminating since it comes from a list
break;
case EventStream.NewEvents:
stream = NewEventObservable; // Unterminating, needs to be cancelled using the CancelToken when desired
break;
case EventStream.ActionableEvents:
stream = AllEventObservable.Where(e => e is IActionableEvent);
break;
case EventStream.NewActionableEvents:
stream = NewEventObservable.Where(e => e is IActionableEvent);
break;
case EventStream.NonActionableEvents:
stream = AllEventObservable.Where(e => !(e is IActionableEvent));
break;
case EventStream.NewNonActionableEvents:
stream = NewEventObservable.Where(e => !(e is IActionableEvent));
break;
default:
throw new NotImplementedException();
}
projection.Reset();
projection.CancelToken = stream
.Finally(() => {
projection.OnFinish();
if (projection.CancelToken != null)
{
projection.CancelToken.Dispose();
projection.CancelToken = null;
}
})
.Subscribe(e => {
if (!projection.Process(e))
{
projection.CancelToken.Dispose();
projection.CancelToken = null;
}
});
}