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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

Developing a bi-directional gateway

NATS sends a bunch of bytes around, but Tuxedo requests and responses carry around more information. For both systems to communicate seamlessly, we have to advance NATS messages:

  • Requests in Tuxedo have flags such as TPTRAN and TPNOREPLY that indicate that the service call is a part of a global transaction and that no response is expected from the service. NATS does not support transactions, so we do not need the TPTRAN flag, but TPNOREPLY is useful.
  • Tuxedo supports multiple typed buffers. We could find a way to encode CARRAY, STRING, and FML32 messages but for simplicity, we will support only FML32 messages that are sent as Python dictionaries.
  • Responses in Tuxedo have the rval, rcode, and data fields, and we will need them all in our gateway.

To include all extra information in NATS messages, we will use JSON data converted to bytes. The service request will have the following format:

{"flags":"TPNOREPLY...

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