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Modernizing Oracle Tuxedo Applications with Python

Modernizing Oracle Tuxedo Applications with Python

By : Kalvans
4.8 (8)
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Modernizing Oracle Tuxedo Applications with Python

Modernizing Oracle Tuxedo Applications with Python

4.8 (8)
By: 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)
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1
Section 1: The Basics
6
Section 2: The Good Bits
12
Section 3: Integrations

Calling a service

The most common way of calling services is by using the tpcall function, as we did before. In addition to service name and request data, there is a third argument named flags. The possible values are as follows:

  • TPSIGRSTRT means that any underlying system call that is interrupted by a signal will be retried. The short advice regarding signals is do not use them and you will not need the flag.
  • TPNOBLOCK instructs to call a service in try tpcall mode. If the request queue is full, the call will return immediately instead of waiting until there is plenty of space for the request. The call will return with an exception code, TPEBLOCK.
  • TPNOTIME is slightly related to the TPNOBLOCK flag. By default, the tpcall function will wait for free space in the request queue until the blocking timeout occurs. Using TPNOTIME makes the tpcall immune to this timeout at the risk of waiting for a long time. We will cover that in detail in Chapter 7, Distributed Transactions...

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