/// <summary>
/// Listen for this message with a strongly typed payload
/// </summary>
/// <typeparam name="TPayload"></typeparam>
/// <param name="onBroadcast"></param>
/// <returns>A disposable token. After it is disposed, the message handler is removed. Caller must maintain a reference to the token!</returns>
public IDisposable Listen(Func <TPayload, Task> onBroadcast)
{
var tuple = new Tuple <Type, Func <object, Task> >(this.GetType(), async arg => await onBroadcast((TPayload)arg));
if (Broadcaster._subscribers.Contains(tuple))
{
return(null);
}
Broadcaster._subscribers.Add(tuple);
var token = new ListenerToken(() => Broadcaster._subscribers.Remove(tuple));
return(token);
}
/// <summary>
/// Listen for enum-based messages with loosely typed payloads
/// </summary>
/// <typeparam name="TMessageType"></typeparam>
/// <param name="message"></param>
/// <param name="onBroadcast"></param>
/// <returns>Null if already subscribed! A disposable token. After it is disposed, the message handler is removed. Caller must maintain a reference to the token!</returns>
public IDisposable Listen(TMessageType message, Func <object, Task> onBroadcast)
{
if (!_broadcaster.TryGetTarget(out var broadcaster))
{
return(null);
}
var tuple = new Tuple <Enum, Func <object, Task> >(message, onBroadcast);
if (broadcaster._subscribers.Contains(tuple))
{
return(null);
}
broadcaster._subscribers.Add(tuple);
var token = new ListenerToken(() => broadcaster._subscribers.Remove(tuple));
return(token);
}