J2EE Design Patterns

Name

Business Delegate Factory

Goal

Simplify instantiation and configuration of business delegates.

Participants

Client

Manipulates business tier data using a delegate.

Business delegate factory

Configures and instantiates business delegates.

Business delegates

Locate, connect to, and interact with business services (Figure B-8).

Figure B-8. Interactions in the Business Delegate Factory pattern

Interactions

A client creates a new instance of a business delegate factory. The client sets attributes of the factory that control the type and options of the desired delegate. The factory generates a new instance of the requested delegate with the relevant parameters and returns it to the client. The client uses the delegate to interact with the business tier.

Notes

A business delegate factory may be stateful or stateless. If the factory is stateless, each call must contain all the required configuration parameters, but the factory can be a singleton.