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Microservices with Clojure

Microservices with Clojure

By : Anuj Kumar
4.5 (2)
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Microservices with Clojure

Microservices with Clojure

4.5 (2)
By: Anuj Kumar
Buy this Book

Overview of this book

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.
Table of Contents (13 chapters)
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Preface
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Preface
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Who this book is for
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What this book covers
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To get the most out of this book
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Get in touch
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1
Monolithic Versus Microservices
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Monolithic Versus Microservices
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Dawn of application architecture
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Monolithic architecture
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Microservices
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When to use what
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Monolithic applications to microservices
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Summary
2
Microservices Architecture
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Microservices Architecture
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Domain-driven design
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Components
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Messaging and contracts
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Service discovery
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Data management
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Automated continuous deployment
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Summary
3
Microservices for Helping Hands Application
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Microservices for Helping Hands Application
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Design
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Monolithic architecture
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Moving to microservices
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Workflows for Helping Hands
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Summary
4
Development Environment
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Development Environment
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Clojure and REPL
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Clojure build tools
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Clojure project
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Clojure IDE
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Summary
5
REST APIs for Microservices
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REST APIs for Microservices
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Introducing REST
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RESTful APIs
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REST APIs for Helping Hands
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Summary
6
Introduction to Pedestal
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Introduction to Pedestal
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Pedestal concepts
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Creating a Pedestal service
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Using server-sent events (SSE)
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Using WebSockets
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Summary
7
Achieving Immutability with Datomic
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Achieving Immutability with Datomic
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Datomic architecture
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Using Datomic
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Summary
8
Building Microservices for Helping Hands
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Building Microservices for Helping Hands
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Implementing Hexagonal Architecture
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Creating a microservice for Service Consumer
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Creating a microservice for Service Provider
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Creating a microservice for Services
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Creating a microservice for Order
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Creating a microservice for Lookup
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Creating a microservice for alerts
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Summary
9
Configuring Microservices
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Configuring Microservices
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Configuration principles
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Using Omniconf for configuration
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Managing application states with mount
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Summary
10
Event-Driven Patterns for Microservices
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Event-Driven Patterns for Microservices
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Implementing event-driven patterns
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Introduction to Apache Kafka
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Using Kafka for Helping Hands
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Summary
11
Deploying and Monitoring Secured Microservices
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Deploying and Monitoring Secured Microservices
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Enabling authentication and authorization
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Monitoring microservices
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Deploying microservices at scale
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Summary
12
Other Books You May Enjoy
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Other Books You May Enjoy
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REST APIs for Microservices

"Coming together is a beginning; keeping together is progress; working together is success."

- Henry Ford

One of the modes of interaction among microservices is direct messaging via APIs. REST APIs are one of the ways to make the direct messaging possible among microservices. REST APIs enable interoperability among microservices irrespective of the technology stack in which they are implemented. In this chapter, we will cover the following topics:

  • The concept of REST
  • How to define REST URIs with appropriate methods with status codes
  • How to use REST-based HTTP URIs using utilities such as cURL
  • REST APIs for the Helping Hands application
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Tech Concepts
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Programming languages
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Microservices with Clojure
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