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

Scaling workflows – message queues and task queues


One important aspect of scalability is to reducing coupling between systems. When two systems are tightly coupled, they prevent each other from scaling beyond a certain limit.

For example, a code written serially, where data and computation is tied into the same function, prevents the program from taking advantage of the existing resources like multiple CPU cores. When the same program is rewritten to use multiple threads (or processes) and a message passing system like a queue in between, we find it scales well to multiple CPUs. We've seen such examples aplenty in our concurrency discussion.

In a much similar way, systems over the Web scale better when they are decoupled. The classic example is the client/server architecture of the Web itself, where clients interact via well-known RestFUL protocols like HTTP, with servers located in different places across the world.

Message queues are systems that allow applications to communicate in a decoupled...