Book Image

Software Architecture with Python

By : Anand Balachandran Pillai
Book Image

Software Architecture with Python

By: Anand Balachandran Pillai

Overview of this book

This book starts by explaining how Python fits into an application's architecture. As you move along, you will get to grips with architecturally significant demands and how to determine them. Later, you’ll gain a complete understanding of the different architectural quality requirements for building a product that satisfies business needs, such as maintainability/reusability, testability, scalability, performance, usability, and security. You will also use various techniques such as incorporating DevOps, continuous integration, and more to make your application robust. You will discover when and when not to use object orientation in your applications, and design scalable applications. The focus is on building the business logic based on the business process documentation, and understanding which frameworks to use and when to use them. The book also covers some important patterns that should be taken into account while solving design problems, as well as those in relatively new domains such as the Cloud. By the end of this book, you will have understood the ins and outs of Python so that you can make critical design decisions that not just live up to but also surpassyour clients’ expectations.
Table of Contents (18 chapters)
Software Architecture with Python
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
Index

Event-driven programming


Event-driven programming is a paradigm of system architecture where the logic flow within the program is driven by events such as user actions, messages from other programs, or hardware (sensor) inputs.

In Event-driven architectures, there is usually a main event loop, which listens for events, and then triggers callback functions with specific arguments when an event is detected.

In modern operating systems like Linux, support for events on input file descriptors such as sockets or opened files are implemented by system calls such as select, poll, and epoll.

Python provides wrappers to these system calls via its select module. It is not very difficult to write a simple Event-driven program using the select module in Python.

The following set of programs together implement a basic chat server and client in Python using the power of the select module.

Chat server and client using I/O multiplexing with the select module

Our chat server uses the select system call via the...