public async Task <int> Unsubscribe(int userId, string topic, SubscribeItem.SubType type)
{
using (var context = new HypixelContext())
{
var subs = context.SubscribeItem.Where(s => s.UserId == userId && s.TopicId == topic && s.Type == type).FirstOrDefault();
if (subs != null)
{
context.SubscribeItem.Remove(subs);
}
if (type.HasFlag(SubscribeItem.SubType.PRICE_HIGHER_THAN) || type.HasFlag(SubscribeItem.SubType.PRICE_LOWER_THAN))
{
RemoveSubscriptionFromCache(userId, topic, type, PriceUpdate);
}
if (type.HasFlag(SubscribeItem.SubType.SOLD))
{
RemoveSubscriptionFromCache(userId, topic, type, Sold);
}
if (type.HasFlag(SubscribeItem.SubType.OUTBID))
{
RemoveSubscriptionFromCache(userId, topic, type, outbid);
}
if (type.HasFlag(SubscribeItem.SubType.AUCTION))
{
RemoveSubscriptionFromCache(userId, topic, type, AuctionSub);
}
return(await context.SaveChangesAsync());
}
}
private static void RemoveSubscriptionFromCache(int userId, string topic, SubscribeItem.SubType type, ConcurrentDictionary <string, ConcurrentBag <SubscribeItem> > target)
{
if (target.Remove(topic, out ConcurrentBag <SubscribeItem> value))
{
target.AddOrUpdate(topic, (key) => RemoveOldElement(userId, topic, type, value),
(key, old) => RemoveOldElement(userId, topic, type, old));
}
}
private static bool SubscribeItemEqual(int userId, string topic, SubscribeItem.SubType type, SubscribeItem s)
{
return(s.UserId == userId && s.TopicId == topic && s.Type == type);
}
private static ConcurrentBag <SubscribeItem> RemoveOldElement(int userId, string topic, SubscribeItem.SubType type, ConcurrentBag <SubscribeItem> old)
{
return(new ConcurrentBag <SubscribeItem>(old.Where(s => !SubscribeItemEqual(userId, topic, type, s))));
}
