public static bool HasItems <T>([AllowNull] this List <T> collection, [NotNull] Predicate <T> action)
{
if (collection.CheckIsNotNull() is false || action.CheckIsNotNull() is false)
{
return(false);
}
return(collection.TrueForAll(action.ArgumentNotNull()));
}
public SubscriptionToken Subscribe <TEvent>(Action <TEvent> action, Predicate <TEvent> filter)
{
action.ArgumentNotNull(nameof(action));
filter.ArgumentNotNull(nameof(filter));
Type eventType = typeof(TEvent);
if (!this.eventSubscriptions.ContainsKey(eventType))
{
this.eventSubscriptions.Add(eventType, new Collection <IEventSubscription>());
}
ICollection <IEventSubscription> subscriptions = this.eventSubscriptions[eventType];
var eventSubscription = new EventSubscription <TEvent>(action, filter);
eventSubscription.SubscriptionToken = new SubscriptionToken(t => subscriptions.Remove(eventSubscription));
subscriptions.Add(eventSubscription);
return(eventSubscription.SubscriptionToken);
}
public EventSubscription(Action <TPayload> action, Predicate <TPayload> filter)
{
this.action = action.ArgumentNotNull(nameof(action));
this.filter = filter.ArgumentNotNull(nameof(filter));
}
