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What Are Clients, Servers, and Services in a BEA Tuxedo Environment
This topic describes a client, server, and services in a BEA Tuxedo environment.
What Is a BEA Tuxedo Client
A client is a program that collects a request from a user and passes that request to a server capable of fulfilling it. It can reside on a PC or workstation as part of the front end of an application. It can also be embedded in software that reads a communication device such as an ATM machine from which data is collected and formatted before being processed by BEA Tuxedo servers.
To be a client, a program must be able to invoke the BEA Tuxedo libraries of functions and procedures known collectively as the Application to Transaction Monitor Interface, or ATMI. The ATMI is supported in several language bindings.
A client joins a BEA Tuxedo application by calling the ATMI client initialization routine. Once it has joined an application, a client can define transaction boundaries and call ATMI functions that enable it to communicate with other programs in your application. The client leaves the BEA Tuxedo application by issuing an ATMI termination function. By joining an application only when necessary and leaving it once the appropriate task is complete, a client frees BEA Tuxedo system resources for use by other clients and servers.
When building a distributed application, you must determine how information is gathered and presented to your business for processing. You have complete control over where and when to call ATMI functions, depending upon your business logic and rules. Your program can join one BEA Tuxedo application, perform some tasks and leave, and then join a different BEA Tuxedo application to perform another task. If you are using a multicontexted application, your client can perform tasks in more than one application without leaving any of them.
What Is a BEA Tuxedo Server
A BEA Tuxedo server is a process that oversees a set of services, dispatching them automatically for clients that request them. A service, in turn, is a function within a server program that performs a particular task needed by a business. A bank, for example, might have one service that accepts deposits and another that reports account balances. A server at this bank might receive requests from clients for both services. It is the server's job to dispatch each request to the appropriate service.
Service functions implement business logic through calls to database interfaces such as SQL and, possibly, calls to the ATMI to access additional services, queues, and other resources. The servers on which these services reside then reply to the clients or forward client requests to a new service.
What Are BEA Tuxedo Services
A service is a module of application code that performs a task. Services are compiled and link edited to form executable servers.
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