@InterfaceAudience.Private
public interface ForeignExceptionSnare

This is an interface for a cooperative exception throwing mechanism. Implementations are containers that holds an exception from a separate thread. This can be used to receive exceptions from 'foreign' threads or from separate 'foreign' processes.

To use, one would pass an implementation of this object to a long running method and periodically check by calling rethrowException(). If any foreign exceptions have been received, the calling thread is then responsible for handling the rethrown exception.

One could use the boolean hasException() to determine if there is an exceptoin as well.

NOTE: This is very similar to the InterruptedException/interrupt/interrupted pattern. There, the notification state is bound to a Thread. Using this, applications receive Exceptions in the snare. The snare is referenced and checked by multiple threads which enables exception notification in all the involved threads/processes.