Book Image

Building RESTful Web Services with Spring 5 - Second Edition

By : Raja CSP Raman, Ludovic Dewailly
Book Image

Building RESTful Web Services with Spring 5 - Second Edition

By: Raja CSP Raman, Ludovic Dewailly

Overview of this book

REST is an architectural style that tackles the challenges of building scalable web services. In today's connected world, APIs have taken a central role on the web. APIs provide the fabric through which systems interact, and REST has become synonymous with APIs.The depth, breadth, and ease of use of Spring makes it one of the most attractive frameworks in the Java ecosystem. Marrying the two technologies is therefore a very natural choice.This book takes you through the design of RESTful web services and leverages the Spring Framework to implement these services. Starting from the basics of the philosophy behind REST, you'll go through the steps of designing and implementing an enterprise-grade RESTful web service. Taking a practical approach, each chapter provides code samples that you can apply to your own circumstances.This second edition brings forth the power of the latest Spring 5.0 release, working with MVC built-in as well as the front end framework. It then goes beyond the use of Spring to explores approaches to tackle resilience, security, and scalability concerns. Improve performance of your applications with the new HTTP 2.0 standards. You'll learn techniques to deal with security in Spring and discover how to implement unit and integration test strategies.Finally, the book ends by walking you through building a Java client for your RESTful web service, along with some scaling techniques using the new Spring Reactive libraries.
Table of Contents (21 chapters)
Title Page
Copyright and Credits
Packt Upsell
Spring Security and JWT (JSON Web Token)

Cache implementation

So far, we have seen the theory part in this chapter. Let's try to implement the concept in our application. To simplify the cache implementation, we are going to use only user management. We will use the getUser (single user) REST API to apply our caching concept.

The REST resource

In the getUser method, we will pass the right userid to the path variable, assuming the client will pass the userid and get the resource. There are many caching options available to implement. Here, we will use only the If-Modified-Since caching mechanism. As this mechanism will pass the If-Modified-Since value in the header, it will be forwarded to the server, saying that, if the resource is changed after the specified time, get the resource fresh, or else return null.

There are many ways we can implement caching. As our goal is to simplify and convey the message clearly, we will keep the code simple, instead of adding complexity in the code. In order to implement this caching, we might need...