Advantages Discussed Session Facade J2EE Design Patterns Example

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Tags/Keywords : Advantages-Discussed - Session-Facade - J2EE-Design-Patterns Example
Author : ISHTEK
Date (Year/Month/Date): 2009-05-26 Advantages or Benefits of Session Facade J2EE Design Pattern What are the benefits or advantages of Session Facade J2EE Design Pattern ? To my understanding, Session Facade is the entry point/ access point to business services, those are deployed in form of transactional, secure, clusterable, distributed business code/bean in EJB Container. I think, 1. Session Facade Design Pattern can facilitate in achiving coarse grain method calls, to reduce number of fine-grain remote method calls to minimum. As each remote method call is RMI communication from stub to skeleton with marshal and unmarshaling of objects passed as method argument/ parameter by value. Method call is delegated to the EJB Container and EJB Container manages life cycle of Enterprise JavaBean, and invokes method on the deployed component. 2. Session Facade Design Pattern can help in managing transaction and security services, by reducing potential number of entry points or methods to the business services. 3. Session Facade Design Pattern can use declarative transaction and security services, by configuration of session bean, thus complexities related to transactions and security services are substantially reduced, in comparison to programmative transaction services like JTA. 4. Session Facade Design Pattern can facilitate scalling of businees side code of application to suit availability and failover and load balancing criterials/Non Functional Requirements(NFR). 5. With Session Facade Design Pattern, caller can be any program that has JNDI implementation, on Java Platform. 6. If Session Facade Design Pattern is made stateless, then caller can be served by any node in the cluster and thus no need for session replication overheads across different nodes in cluster environment. These are my own understanding only, If you are interested in adding or contracting any of these, you are most welcome to do so just by writing or commenting on this Page.

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