/// <summary>
/// Cancel the subscriber's listening and remove it from the dictionary so that GC can reclaim the resources it occupies
/// </summary>
public async Task RemoveAsync(IMessageSubscriber messageSubscriber)
{
CheckValue.NotNull(messageSubscriber, nameof(messageSubscriber));
//if no result,return completed directly.
if (!_subscriberDic.TryGetValue(messageSubscriber, out _))
{
await messageSubscriber.DisposeAsync();
}
_subscriberDic.TryRemove(messageSubscriber, out _);
await messageSubscriber.DisposeAsync();
}