public PresenceDocument Subscribe(string subscriptionId, string publisherId, int expires)
{
PresenceDocument document;
var exriresKey = new SubscriptionExpiresKey(publisherId, subscriptionId);
if (expires > 0)
{
var publication = GetValidPublication(publisherId, true);
var subscription = new Subscription(subscriptionId, expires);
publication.Subscriptions.Replace(subscription);
subscriptionTimer.Change(exriresKey, (expires + 10) * 1000);
document = publication.Document;
}
else
{
var publication = GetValidPublication(publisherId, false);
if (publication != null)
{
if (publication.Subscriptions.RemoveFirst(subscriptionId, IsSubscriptionIdEquals))
{
OnSubscriptionRemoved(subscriptionId);
}
}
subscriptionTimer.Remove(exriresKey);
document = null;
}
return(document);
}
private void SubscriptionExpired(SubscriptionExpiresKey key)
{
Publication publication;
if (publications.TryGetValue(key.PublicationId, out publication))
{
if (publication.Subscriptions.RemoveFirst(key.SubscriptionId, IsSubscriptionIdEquals))
{
OnSubscriptionRemoved(key.SubscriptionId);
OnSubscriptionExpired(key.PublicationId, key.SubscriptionId);
}
}
}
