Book Image

Modernizing Oracle Tuxedo Applications with Python

By : Aivars Kalvans
Book Image

Modernizing Oracle Tuxedo Applications with Python

By: Aivars Kalvans

Overview of this book

Despite being developed in the 1980s, Oracle Tuxedo still runs a significant part of critical infrastructure and is not going away any time soon. Modernizing Oracle Tuxedo Applications with Python will help you get to grips with the most important Tuxedo concepts by writing Python code. The book starts with an introduction to Oracle Tuxedo and guides you in installing its latest version and Python bindings for Tuxedo on Linux. You'll then learn how to build your first server and client, configure Tuxedo, and start running an application. As you advance, you'll understand load balancing and work with the BBL server, which is at the heart of a Tuxedo application. This Tuxedo book will also cover Boolean expressions and different ways to export Tuxedo buffers for storage and transmission, before showing you how to implement servers and clients and use the management information base to change the configuration dynamically. Once you've learned how to configure Tuxedo for transactions and control them in application code, you'll discover how to use the store-and-forward functionality to reach destinations and use an Oracle database from a Tuxedo application. By the end of this Oracle Tuxedo book, you'll be able to perform common Tuxedo programming tasks with Python and integrate Tuxedo applications with other parts of modern infrastructure.
Table of Contents (18 chapters)
1
Section 1: The Basics
6
Section 2: The Good Bits
12
Section 3: Integrations

Understanding queues

As we learned in Chapter 1, Introduction and Installing Tuxedo, parts of Tuxedo's APIs were standardized in XATMI specifications with the hope that developing applications according to XATMI specifications would lead to vendor-neutral solutions and it would be easy to port applications from one XATMI implementation to another. This idea looks good on paper, but no specification can cover all aspects of behavior and be abstract at the same time. No surprises there.

The server provides resources that the client can access. A server can also act as a client and ask for the resources provided by another server as shown in the following diagram. The XATMI specification does not say how the request and response should be delivered between the client and server:

Figure 3.1 – Client-server model

Figure 3.1 – Client-server model

Tuxedo uses queues for that. Servers have a request queue where they receive requests from clients. Servers and clients have a response...