public interface ModulePreprocessor
extends ModuleProcessor, Cancelable

A module preprocessor defines a step that occurs just prior to the actual execution of a Module. Typically, a preprocessor prepares the module for execution in some way, such as populating module inputs or checking prerequisites.

The preprocessor may decide to cancel the module's pending execution, subject to its own criteria. In this case, its Cancelable.isCanceled() method will return true, and its Cancelable.getCancelReason() method may optionally explain why.