dde91606_Chapter_5__Advanced_Concepts__Description
[Name] rejection_policy [Description] 
Determines what happens when the thread pool (and queue, if enabled) is full. The default is to run on the caller's thread. "Abort" throws an runtime exception. "Discard" discards the message, "DiscardOldest" discards the oldest entry in the queue. Note that these values might change, for example a "Wait" value might get added in the future.
Chapter 5. Advanced Concepts
Description