How the BEA Tuxedo System Fits into the Client/Server Model


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Introducing the BEA Tuxedo System

The BEA Tuxedo system fits into the middle of the client/server model. In a BEA Tuxedo application, clients log in and request services offered by an application. The BEA Tuxedo system offers these services through a transparent bulletin board. The bulletin board contains a directory advertising services. In a banking application, for example, the bulletin board might advertise deposit, withdrawal, and inquiry services. The BEA Tuxedo system then finds a server (for example, at the appropriate branch or district office) that can provide the requested services.

Clients and Servers in a Sample Banking Application

The preceding figure shows the primary building blocks of a BEA Tuxedo application:

Clients-programs that collect input from users, sends requests through the BEA Tuxedo system to servers, and then collects the replies from servers and delivers them to the users.
Servers-programs that encapsulate the business logic into a set of services that define the application.
Middleware-comprises all the distributed software needed to support interactions between clients and servers. It is the medium that enables a client to obtain a service from a server. Middleware includes: API functions used by the client (to issue requests and receive replies) and the server (to issue replies) and messaging paradigms used to transmit client requests and server responses over a network. Middleware does not include any of the following: the user interface on the client, application logic, and services provided by servers.

In this sample BEA Tuxedo application at a bank, clients (cash machines and tellers) make requests, and servers (at branch and district offices) provide services and responses. For example, a customer may use a cash machine to find out how much money is available in his personal checking account. The cash machine (a client) calls the server to get the balance. The server receives the request, retrieves the balance, and sends the information to the cash machine.