Book Image

Practical Microservices

By : Umesh Ram Sharma
Book Image

Practical Microservices

By: Umesh Ram Sharma

Overview of this book

<p>A microservice architecture helps you build your application as a suite of different services. This approach has been widely adopted as it helps to easily scale up your application with reduced dependencies. This way if a part of your application is corrupted, it can be fixed easily thereby eliminating the possibility of completely shutting down your software. This book will teach you how to leverage Java to build scalable microservices. You will learn the fundamentals of this architecture and how to efficiently implement it practically.</p> <p>We start off with a brief introduction to the microservice architecture and how it fares with the other architectures. The book dives deep into essential microservice components and how to set up seamless communication between two microservice end points. You will create an effective data model and learn different ways to test and deploy a microservices. You will also learn the best way to migrate your software from a monolith to a microservice architecture.</p> <p>Finishing off with monitoring, scaling and troubleshooting, this book will set a solid foundation for you to start implementing microservices.</p>
Table of Contents (17 chapters)
Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Contract testing


A contract is an agreement that explains the way in which two parties deal. In the same way, a contract in the context of services is an agreed format in which a service should be called. Alternatively, in the microservice context, we can say that it is an agreement between a consumer and an API provider that describes the exact manner of communication and the format of the expected input and output. Contract testing is different as compared to integration testing. Let's understand this with an example. Suppose we have a loan servicing application. Before sanctioning a loan to the customer, our application needs to deal with third-party service to know the existing loan amount for that customer, which they might have taken from another bank or a lending company. What happens if, for some reason, someone changes the contract on the third-party service side? Our application integration test works perfectly fine, as we have mocked the external service, but in the production...