Hook: Make Object Persistent

Requirement

An object that is not " known " to the Shop and not reachable by it through references must be made persistent.

The Objects " known " to the Shop are:

• The global UserManager .
• The global password garbler .

Method of Adaptation

Add Feature

Level of Support

Parameter Pattern

HotSpot

Persistance

Participants

shopInstance, key , object

Changes

1. select ( key , object ) from ( String , Object ). object is the object to be made persistent. key must be unique for each persitent object.
2. call shopInstance.setObjectPersistent with parameters key , object .

Comments

• You can access the persistent object through calls to sale.Shop.getPersistentObject passing the key you specified when defining the persistent object. sale.Shop.setObjectTransient makes an object transient again.
• Objects that are either " known " to the Shop or that are reachable by reference from the Shop or from an object " known " to the Shop are persistent by default. These objects cannot be made transient.