Shopper

By: J. Doble

A consumer creates a shopper object with a list of requests. The shopper traverses a set of objects and collects the requested items.

• Strategy [Gamma+95] can allow mixing and matching of provider traversal and item selection strategies.
• Provider traversal can be implemented using Iterator [Gamma+95]
• This pattern is similar to Chain of Responsibility [Gamma+95], where the providers are the handlers and the shopping list is a composite request.