What patterns are used to improve performance and scalability of the application ?

Value Object (VO)

• A serializable object which would contain lot of atomic values.
• used as a course grained call which gets lots of data in one go (this reduces remote overhead).
• is made serializable for it to be transferred between different tiers within a single remote method invocation.

Session Façade

• hides the complexity of business components and centralizes the workflow.
• provides course-grained interfaces to the clients which reduces the remote method overhead.
• fits well with declarative transactions and security management.

Business Delegate

• used to reduce the coupling between the presentation and business-logic tier.
• provides a proxy to the façade from where one could call the business classes or DAO class.
• can be used with Service Locator pattern for improving performance.

Service Locator

• provides a solution for looking-up, creating and locating services and encapsulating their complexity.
• provides a single point of control and it also improves performance.