/// <inheritdoc />
public async Task ProduceAsync(int batchSize, CancellationToken cancellationToken = default)
{
IReadOnlyCollection <Attendee> unprocessedAttendees = await _attendeeRepository.GetUnprocessedAsync(batchSize);
if (!unprocessedAttendees.Any())
{
return;
}
IReadOnlyCollection <GroupEvent> groupEvents = await _groupEventRepository.GetForAttendeesAsync(unprocessedAttendees);
if (!groupEvents.Any())
{
return;
}
Dictionary <Guid, GroupEvent> groupEventsDictionary = groupEvents.ToDictionary(g => g.Id, g => g);
var notifications = new List <Notification>();
foreach (Attendee attendee in unprocessedAttendees)
{
Result result = attendee.MarkAsProcessed();
if (result.IsFailure)
{
continue;
}
GroupEvent groupEvent = groupEventsDictionary[attendee.EventId];
List <Notification> notificationsForAttendee = NotificationType
.List
.Select(notificationType => notificationType.TryCreateNotification(groupEvent, attendee.UserId, _dateTime.UtcNow))
.Where(maybeNotification => maybeNotification.HasValue)
.Select(maybeNotification => maybeNotification.Value)
.ToList();
notifications.AddRange(notificationsForAttendee);
}
_notificationRepository.InsertRange(notifications);
await _unitOfWork.SaveChangesAsync(cancellationToken);
}
