public IObservable <TResponse> CreateRequestResponseOperation <TRequest, TResponse>(string operationName, TRequest request, bool waitForSuitableService = false)
{
return(Observable.Create <TResponse>(o =>
{
_log.Info("Creating request response operation");
var disposables = new CompositeDisposable();
disposables.Add(
// we only take one as once we've found a service we use that for the remainder of the operation,
// if there are errors, a higher level service will deal with how to retry
_serviceInstanceStreamCache.GetServiceWithMinLoad(waitForSuitableService)
.Take(1)
.Subscribe(serviceInstanceStatus =>
{
if (!serviceInstanceStatus.IsConnected)
{
o.OnError(new InvalidOperationException("Disconnected"));
}
var remoteProcedure = $"{serviceInstanceStatus.ServiceId}.{operationName}";
_log.Info($"Will use service instance [{serviceInstanceStatus}] for request response operation");
disposables.Add(
_connection
.RequestResponse <TRequest, TResponse>(remoteProcedure, request)
.Subscribe(o)
);
}, o.OnError)
);
return disposables;
}));
}