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Mastering Microservices with Java

You're reading from   Mastering Microservices with Java Build enterprise microservices with Spring Boot 2.0, Spring Cloud, and Angular

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Product type Paperback
Published in Feb 2019
Publisher Packt
ISBN-13 9781789530728
Length 446 pages
Edition 3rd Edition
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Author (1):
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Sourabh Sharma Sourabh Sharma
Author Profile Icon Sourabh Sharma
Sourabh Sharma
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Table of Contents (22) Chapters Close

Preface 1. Section 1: Fundamentals FREE CHAPTER
2. A Solution Approach 3. Environment Setup 4. Domain-Driven Design 5. Implementing a Microservice 6. Section 2: Microservice Patterns, Security, and UI
7. Microservice Patterns - Part 1 8. Microservice Patterns - Part 2 9. Securing Microservices 10. Consuming Services Using the Angular App 11. Section 3: Inter-Process Communication
12. Inter-Process Communication Using REST 13. Inter-Process Communication Using gRPC 14. Inter-Process Communication Using Events 15. Section 4: Common Problems and Best Practices
16. Transaction Management 17. Service Orchestration 18. Troubleshooting Guide 19. Best Practices and Common Principles 20. Converting a Monolithic App to a Microservice-Based App 21. Other Books You May Enjoy

Circuit breaker

In general terms, a circuit breaker is:

An automatic device for stopping the flow of current in an electrical circuit, as a safety measure.

The same concept is used for microservice development, known as the circuit breaker design pattern. It tracks the availability of external services such as Eureka Server, API services such as restaurant-service, and so on, and prevents service consumers from performing any action on any service that is not available.

It is another important aspect of microservice architecture, a safety measure (a failsafe mechanism) for when the service does not respond to a call made by the service consumer—a circuit breaker.

We'll use Netflix Hystrix as a circuit breaker. It calls the internal fallback method in the service consumer when failures occur (for example, due to a communication error or timeout). Hystrix code gets executed...

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