10.5. A Multitiered Architecture
IDP hosts the servers and handles the transactions that flow through Web ePOST. The platform infrastructure reflects a multitier architecture: Web server, application server, database server, and directory server. There are industrial-strength printing servers connected to the infrastructure, as well. Corporations also have the option of hosting the application in their own IT infrastructures. Physically, all these servers can run anywhere—even inside a corporation's firewalls.
To Web-enable IDP's ePOST application, IDP and Sun Professional Services utilized three different EJBs—administration-service bean, customer-service bean, and hybrid-mail service bean. Each of these EJBs is a stateless session bean running ...
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