6.1 OC4J Server Process

In a simple scenario, the Forms Servlet renders the start HTML file and provides the information about the Forms Listener Servlet to the client. An HTTP request is then received by the Oracle HTTP Server Listener, which passes it off to the Forms Listener Servlet running inside OC4J. The Forms Listener Servlet establishes a Forms Server runtime process and is responsible for on-going communication between the client browser and the runtime process. As more users request Oracle Forms sessions, the requests are received by the Oracle HTTP Server Listener. The HTTP Listener again passes them off to the Forms Listener Servlet, which will establish more runtime processes. The Forms Listener Servlet can handle many Forms runtime sessions simultaneously. While there is, of course, a limit to the number of concurrent users, the architecture presents a number of opportunities for tuning and configuration to achieve better performance (see Section 6.2, "Performance/Scalability Tuning").

Figure 6-1, "OC4J Architecture and Forms Services" shows how Forms Services uses the OC4J architecture:

Figure 6-1 OC4J Architecture and Forms Services