Contexts of data storage in EJB3 (transactional, request, session)

Question

Limits:

• JBoss AS 5.
• Business logic based on stateless EJB3. Some methods very long calculate data process.
• Client based on Swing.

I want to:

• Various context of data storage (transactional, request, session context).
• Caching the result of calling methods in EJB3 (in context). Emulate pure function of the functional programming (Memoization).

Solutions:

• Statefull EJB.
• ThreadLocal variables.
• TransactionSynchronizationRegistry.
• Direct transfer of context.
• Others.

p/s Just now solution based on ThreadLocal variables.

p/s/s Sorry for my bad english.