private static IObservable<ServiceState> CallOperationOnService(ServiceBase serviceBase, Operation operation)
{
ReplaySubject<ServiceState> result = new ReplaySubject<ServiceState>();
result.OnNext(operation.InitialState);
var methodObs = Observable.Start(() =>
{
Type serviceBaseType = serviceBase.GetType();
object[] parameters = null;
if (operation == Operations.Start)
{
parameters = new object[] { null };
}
try
{
serviceBaseType.InvokeMember(operation.MethodCall, BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.InvokeMethod, null, serviceBase, parameters);
}
catch (Exception ex)
{
throw new Exception(string.Format("An exception was thrown while trying to call the {0} of the {1} service. Examine the inner exception for more information.", operation, serviceBase.ServiceName), ex.InnerException);
}
});
methodObs.Subscribe
(
_ =>
{
result.OnNext(operation.FinishedState);
result.OnCompleted();
},
ex =>
{
result.OnNext(operation.ErrorState);
result.OnError(ex);
}
);
return result;
}
