Interface PreRunnable<WD extends WorkDefinition,AH extends ActivityHandler<WD,AH>>

Functional Interface:
This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface public interface PreRunnable<WD extends WorkDefinition,AH extends ActivityHandler<WD,AH>>
A code that executes before local or distributing activity run takes place.