/// <exception cref="System.TimeoutException">Thrown when no response to publish service request.</exception>
/// <exception cref="System.AggregateException">Thrown if publish service request failed.</exception>
public IDisposable ProvideOptionally <TRequest, TResponse>(Func <TRequest, Optional <TResponse> > func)
where TRequest : IRequestData <TResponse>
where TResponse : IResponseData
{
var requestType = typeof(TRequest);
if (!_implements.Contains(requestType))
{
var publishServiceRequest = new PublishServiceRequest(new[] { requestType.GetPayloadTypeName() });
if (!_requestSender.Send(publishServiceRequest)
.Wait(TimeSpan.FromSeconds(30)))
{
throw new TimeoutException("Publish service request timed out.");
}
// This is a bit race condition prone, however does not matter.
// There are no problems with sending publish service request more than one time.
_implements.Add(requestType);
}
return(_receiver.SubscribeToRequest(func));
}
