| public AddSubscription ( ISubscription subscription ) : void | ||
| subscription | ISubscription | |
| return | void | |
public virtual IDisposable Subscribe(ISubscriber subscriber, string cursor, Func <MessageResult, object, Task <bool> > callback, int maxMessages, object state)
{
if (subscriber == null)
{
throw new ArgumentNullException("subscriber");
}
if (callback == null)
{
throw new ArgumentNullException("callback");
}
Subscription subscription = CreateSubscription(subscriber, cursor, callback, maxMessages, state);
// Set the subscription for this subscriber
subscriber.Subscription = subscription;
var topics = new HashSet <Topic>();
foreach (var key in subscriber.EventKeys)
{
// Create or retrieve topic and set it as HasSubscriptions
Topic topic = SubscribeTopic(key);
// Set the subscription for this topic
subscription.SetEventTopic(key, topic);
topics.Add(topic);
}
subscriber.EventKeyAdded += _addEvent;
subscriber.EventKeyRemoved += _removeEvent;
subscriber.WriteCursor = subscription.WriteCursor;
var subscriptionState = new SubscriptionState(subscriber);
var disposable = new DisposableAction(_disposeSubscription, subscriptionState);
// When the subscription itself is disposed then dispose it
subscription.Disposable = disposable;
// Add the subscription when it's all set and can be scheduled
// for work. It's important to do this after everything is wired up for the
// subscription so that publishes can schedule work at the right time.
foreach (var topic in topics)
{
topic.AddSubscription(subscription);
}
subscriptionState.Initialized.Set();
// If there's a cursor then schedule work for this subscription
if (!String.IsNullOrEmpty(cursor))
{
_broker.Schedule(subscription);
}
return(disposable);
}
private void AddEvent(ISubscriber subscriber, string eventKey)
{
Topic topic = SubscribeTopic(eventKey);
// Add or update the cursor (in case it already exists)
if (subscriber.Subscription.AddEvent(eventKey, topic))
{
// Add it to the list of subs
topic.AddSubscription(subscriber.Subscription);
}
}