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Microservices with Clojure
Microservices with Clojure

Microservices with Clojure: Develop event-driven, scalable, and reactive microservices with real-time monitoring

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Microservices with Clojure

Monolithic Versus Microservices

"The old order changeth yielding place to new"

- Alfred Tennyson

A well-designed monolithic architecture has been the key to many successful software applications. However, microservices-based applications are gaining popularity in the age of the internet due to their inherent property of being autonomous and flexible, their ability to scale independently, and their shorter release cycles. In this chapter, you will:

  • Learn about the basics of monolithic and microservices architectures
  • Understand the monolithic-first approach and when to start using microservices
  • Learn how to migrate an existing monolithic application to microservices
  • Compare and contrast the release cycle and deployment methodology of monolithic and microservices-based applications

Dawn of application architecture

Ever since Ada Lovelace (https://en.wikipedia.org/wiki/Ada_Lovelace) wrote the first algorithm for Analytical Engine (https://en.wikipedia.org/wiki/Analytical_Engine) in the 19th century and Alan Turing (https://en.wikipedia.org/wiki/Alan_Turing) formalized the concepts of algorithm and computation via the Turing machine (https://en.wikipedia.org/wiki/Turing_machine), software has gone through multiple phases in its evolution, both in terms of how it is designed and how it is made available to its end users. The earlier software was designed to run on a single machine in a single environment, and was delivered to its end users as an isolated standalone entity. In the early 1990s, as the focus shifted to application software, the industry started exploring various software architecture methodologies to meet the demands of changing requirements and underlying environments. One of the software architectures that was widely adopted was multitier architecture, which clearly separated the functions of data management, business logic, and presentation. When these layers were packaged together in a single application, using a single technology stack, running as a single program, it was called a monolithic architecture, still in use today.

With the advent of the internet, software started getting offered as a service over the web. With this change in deployment and usage, it started becoming hard to upgrade and add features to software that adopted a monolithic architecture. Technology started changing rapidly and so did programming languages, databases, and underlying hardware. Companies that were able to disintegrate their monolithic applications into loosely-coupled services that could talk to each other were able to offer better services, better integration points, and better performance to their users. They were not only able to upgrade to the latest technology and hardware, but also able to offer new features and services faster to their users. The idea of disintegrating a monolithic application into loosely-coupled services that can be developed, deployed, and scaled independently and can talk to other services over a lightweight protocol, was called microservices-based architecture (https://en.wikipedia.org/wiki/Microservices).

Companies such as Netflix, Amazon, and so on have all adopted a microservices-based architecture. If you look at Google Trends in the preceding screenshot, you can see that the popularity of microservices is rising day by day, but this doesn't mean that monolithic applications are obsolete. There are applications that are still suited for monolithic architecture. Microservices have their advantages, but at the same time they are hard to deploy, scale, and monitor. In this chapter, we will look at both monolithic and microservices-based architectures. We will discuss when to use what and also talk about when and how to migrate from a monolithic to a microservices-based architecture.

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Key benefits

  • Relevance of the microservice architecture and benefits of Clojure's functional and simple features to implement it.
  • Learn best practices and common principles to avoid common pitfalls while developing microservices.
  • Learn how to use Pedestal to build your next microservices, secure them using JWT, and monitor them using the ELK stack

Description

The microservice architecture is sweeping the world as the de facto pattern with which to design and build scalable, easy-tomaintain web applications. This book will teach you common patterns and practices, and will show you how to apply these using the Clojure programming language. This book will teach you the fundamental concepts of architectural design and RESTful communication, and show you patterns that provide manageable code that is supportable in development and at scale in production. We will provide you with examples of how to put these concepts and patterns into practice with Clojure. This book will explain and illustrate, with practical examples, how teams of all sizes can start solving problems with microservices. You will learn the importance of writing code that is asynchronous and non-blocking and how Pedestal helps us do this. Later, the book explains how to build Reactive microservices in Clojure that adhere to the principles underlying the Reactive Manifesto. We finish off by showing you various ways to monitor, test, and secure your microservices. By the end, you will be fully capable of setting up, modifying, and deploying a microservice with Clojure and Pedestal.

Who is this book for?

You should have a working knowledge of programming in Clojure. However, no knowledge of RESTful architecture, microservices, or web services is expected. If you are looking to apply techniques to your own projects, taking your first steps into microservice architecture, this book is for you.

What you will learn

  • Explore the pros and cons of monolithic and microservice architectures
  • Use Clojure to effectively build a reallife application using Microservices
  • Gain practical knowledge of the Clojure Pedestal framework and how to use it to build Microservices
  • Explore various persistence patterns and learn how to use Apache Kafka to build event-driven microservice architectures
  • Secure your Microservices using JWT
  • Monitor Microservices at scale using the ELK stack
  • Deploy Microservices at scale using container orchestration platforms such as Kubernetes

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Jan 25, 2018
Length: 336 pages
Edition : 1st
Language : English
ISBN-13 : 9781788622240
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Product Details

Publication date : Jan 25, 2018
Length: 336 pages
Edition : 1st
Language : English
ISBN-13 : 9781788622240
Languages :
Concepts :
Tools :

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Table of Contents

12 Chapters
Monolithic Versus Microservices Chevron down icon Chevron up icon
Microservices Architecture Chevron down icon Chevron up icon
Microservices for Helping Hands Application Chevron down icon Chevron up icon
Development Environment Chevron down icon Chevron up icon
REST APIs for Microservices Chevron down icon Chevron up icon
Introduction to Pedestal Chevron down icon Chevron up icon
Achieving Immutability with Datomic Chevron down icon Chevron up icon
Building Microservices for Helping Hands Chevron down icon Chevron up icon
Configuring Microservices Chevron down icon Chevron up icon
Event-Driven Patterns for Microservices Chevron down icon Chevron up icon
Deploying and Monitoring Secured Microservices Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Full star icon Half star icon 4.5
(2 Ratings)
5 star 50%
4 star 50%
3 star 0%
2 star 0%
1 star 0%
Felipe Caetano Silva May 16, 2020
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Com relação ao Produto em si, achei o acabamento do livro um pouco a desejar. O Conteúdo é o que eu esperava interessante, um bom introdutório aos microserviços e a clojure.
Amazon Verified review Amazon
Amazon Customer Sep 03, 2020
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
Microservices with Clojure is really great for learning to put together more serious applications and especially for going into depth on using Pedestal for web services.
Amazon Verified review Amazon
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