Hook: Incorporate new Shop

Requirement

An instance of a new subclass of the sale.Shop class is needed to replace the default, because some new behavior was added in the subclass; e.g. options where added to, removed from or replaced in the Shop's MenuSheet, the logging mechanism was changed, or additional global conditions where imposed on shutdown-ability.

Method of Adaptation

Replace Feature

Level of Support

Parameter Pattern

HotSpot

Application architecture

Participants

Shop, NewShop

Changes

1. subclass NewShop of Shop.
2. call Shop.setTheShop with parameter instance of NewShop.

Comments

• The Shop is designed following the Singleton design pattern. sale.Shop.getTheShop returns the singleton instance of the Shop that is to be used globally in the application.
• To change the Shop's MenuSheet, invoke the Define Shop MenuSheet hook.
• To change the standard global logging mechanism provided by the Shop invoke the Change global Logging Behavior hook.
• To impose conditions on shutdown-ability invoke the Change Shutdown Conditions hook.