private async Task applyProjectionsAsync(DocumentSessionBase session, ICollection <EventProjection> projections, IEnumerable <TView> views)
{
var idAssigner = session.Tenant.IdAssignmentFor <TView>();
var resolver = session.Tenant.StorageFor <TView>();
var viewMap = views.ToDictionary(view => (TId)resolver.IdentityFor(view), view => view);
foreach (var eventProjection in projections)
{
var viewId = eventProjection.ViewId;
var hasExistingView = viewMap.TryGetValue(viewId, out var view);
if (!hasExistingView)
{
if (eventProjection.Type == ProjectionEventType.CreateAndUpdate)
{
view = newView(session.Tenant, idAssigner, viewId);
viewMap.Add(viewId, view);
hasExistingView = true;
}
}
if (eventProjection.Type == ProjectionEventType.CreateAndUpdate ||
(eventProjection.Type == ProjectionEventType.UpdateOnly && hasExistingView))
{
session.Store(view);
eventProjection.ProjectTo(session, view).Wait();
}
else if (eventProjection.Type == ProjectionEventType.Delete &&
hasExistingView &&
await eventProjection.ShouldDelete(session, view))
{
session.Delete(view);
}
}
}
