Design Patterns Java™ Workbook

Chain of Responsibility without Composite

CHAIN OF RESPONSIBILITY requires a strategy for ordering the search for an object that can handle a request. Usually, the order to follow will depend on an underlying aspect in the modeled domain. This frequently occurs when there is composition, as in the Oozinoz machine hierarchy. However, this pattern can apply outside object models that are composites.

CHALLENGE 12.5 Cite an example when the CHAIN OF RESPONSIBILITY pattern might occur if the chained objects do not form a composite.