Concurrent Grain Factory

[cmeyertons]

The TestGrainFactory can be invoked outside the Orleans thread-safety guarantees in a parallel fashion by code that is invoking via IClusterClient and should offer functionality for concurrency guarantees.

I received an error in some new code in our codebase that we had to re-shape business logic to satisfy the unit test error

#155

[jkonecki]

Could you please provide more detail on your unit test scenario? What grains are involved and where does the parallelism come into picture? What is your unit test supposed to verify?