IBM WebSphere V5.0 Security - CGISecurity

3. The transfer servlet is the controller between the presentation and the
business logic represented by enterprise Java beans (EJB). The servlet
processes the request.
4. The servlet uses a singleton helper class (TransferHelper) to look up and
store the reference to the Transfer session EJB.
5. The Transfer EJB updates the branch account at the back-end using the
BranchAccount entity EJB, then sends a message to the queue,
itsobankTransferQ, to update the other branch account.
6. Same as the corresponding step for “customer transfer”.
7. The message triggers the IncomingTransfer message-driven bean (MDB) that
picks up the message to process the account update for the branch account.
8. The MDB does not perform business logic, it uses the Transfer EJB for this
purpose.
9. The Transfer EJB uses the BranchAccount entity EJB to update the back-end
database.
The last process described here is the account balance query. A J2EE client
application is also distributed with the sample that performs the query process. It
is a simple GUI application that the user can use to interact with the J2EE
application running on the server.
J2EE Application::AccountViewer
1
Bean::ConsultationHelper
2
Stateless Session EJB::Consultation
3 3
Entity EJB::BranchAccount
Entity EJB::CustomerAccount
Figure A-4 Account balance query process
Appendix A. Sample application 449