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Learn Microservices with Spring Boot - Chapter 7

This repository contains the source code of the practical use case described in the book Learn Microservices with Spring Boot (2nd Edition).

The book follows a pragmatic approach to building a Microservice Architecture. You start with a small monolith and examine the pros and cons that come with a move to microservices.

Chapter 7 version

In Chapter 7, you learn how to achieve loose coupling with an Event-Driven Architecture using a RabbitMQ message broker. Besides, you go through the extra advantages like the ability to implement different messaging patterns, load balancing, and resilience.

Logical View - Chapter 7

The main concepts included in this chapter are:

  • Event-Driven Architectures: Pros and Cons
  • Embracing Eventual Consistency, all the way up to the UI
  • RabbitMQ main concepts, messaging patterns, and practical implementation
  • Refactoring the microservices towards an Event-Driven strategy
  • Resilience with persistent messages

As usual, the book uses this practical implementation to teach you why introducing a message broker between our microservices is a good idea. You learn the patterns before the tools, so you can use your knowledge to build similar architectures using a different technology stack - e.g. Kafka.

Check the Book's Web Page to see the complete list of chapters.

Running the app

Requirements:

  • JDK 14+
  • Node.js v13.10+
  • npm 6.13.7+
  • RabbitMQ 3.8.3+
  1. You need a RabbitMQ server running. Run the server according to the instructions for your OS, for example:
    $ rabbitmq-server
  2. To start the Multiplication microservice, you can use the command line with the included Maven wrapper:
    multiplication$ ./mvnw spring-boot:run
  3. To start the Gamification microservice, you do the same from its corresponding folder:
    gamification ./mvnw spring-boot:run
  4. The React application can be started with npm. First, you need to download the dependencies with:
    challenges-frontend$ npm install
  5. Then, you start the server with:
    challenges-frontend$ npm start

Once the backend and the fronted are started, you can navigate to http://localhost:3000 in your browser and start resolving multiplication challenges. This time, you'll see the Leaderboard.

Application - Screenshot

Questions

  • Do you have questions about how to make this application work?
  • Did you get the book and have questions about any concept explained within this chapter?
  • Have you found issues using updated dependencies?

Don't hesitate to create an issue in this repository and post your question/problem there.

About the book

Are you interested in building a microservice architecture from scratch? You'll face all the challenges of designing and implementing a distributed system one by one, and will be able to evaluate if it's the best choice for your project.

Visit https://tpd.io/book-extra for all the details about the book.

Purchase

You can buy the book online from these stores:

Source code by chapter (all repositories are available on Github)

Extra chapters: