/// <inheritdoc/>
public Task Unsubscribe <T>(BusEvent <T> eventMessage) where T : class
{
if (eventMessage == null)
{
throw new ArgumentNullException(nameof(eventMessage));
}
var @event = (eventMessage is PlatformEvent <T>) ?
eventMessage as PlatformEvent <T> :
throw new ArgumentException($"{nameof(eventMessage)} must be type of {nameof(PlatformEvent<T>)}");
if (!typeof(IMessageListener).IsAssignableFrom(typeof(T)))
{
throw new InvalidOperationException("Type parameter must be an IMessageListener");
}
var eventName = eventMessage.Name;
if (string.IsNullOrWhiteSpace(eventName))
{
throw new ArgumentException($"EventName of {nameof(eventMessage)} cannot be empty");
}
var key = new SubscriptionInfo(eventName, @event.ReplayId, typeof(T));
if (!_subscriptions.ContainsKey(key))
{
return(Task.CompletedTask);
}
// build channel segment
var topicName = GetEventOrTopicName(eventMessage.Name);
var handler = _subscriptions[key];
_streamingClient.UnsubscribeTopic(topicName, handler as IMessageListener, @event.ReplayId);
_subscriptions.TryRemove(key, out var val);
return(Task.CompletedTask);
}
