J2EE Design Patterns

Name

Session Façade

Goal

Increase performance by organizing remote business data in the most efficient manner (Figure B-12).

Figure B-12. Classes in the Session Façade pattern

Participants

Client

Manipulates business data using a façade.

Session façade

Remote object that provides access to business data.

Business objects

Stores business data (Figure B-13).

Figure B-13. Interactions in the Session Façade pattern

Interactions

The client calls a business method of the remote session façade. The façade locates and manipulates business objects locally and returns the result to the client.

Notes

Session façades are most effective when using Session EJBs and EJB local home objects. This combination allows the façade to manipulate EJBs locally, significantly reducing network overhead. Façades usually communicate with clients using DTOs.