Book Image

Modern API Development with Spring and Spring Boot

By : Sourabh Sharma
Book Image

Modern API Development with Spring and Spring Boot

By: Sourabh Sharma

Overview of this book

The philosophy of API development has evolved over the years to serve the modern needs of enterprise architecture, and developers need to know how to adapt to these modern API design principles. Apps are now developed with APIs that enable ease of integration for the cloud environment and distributed systems. With this Spring book, you'll discover various kinds of production-ready API implementation using REST APIs and explore async using the reactive paradigm, gRPC, and GraphQL. You'll learn how to design evolving REST-based APIs supported by HATEOAS and ETAGs and develop reactive, async, non-blocking APIs. After that, you'll see how to secure REST APIs using Spring Security and find out how the APIs that you develop are consumed by the app's UI. The book then takes you through the process of testing, deploying, logging, and monitoring your APIs. You'll also explore API development using gRPC and GraphQL and design modern scalable architecture with microservices. The book helps you gain practical knowledge of modern API implementation using a sample e-commerce app. By the end of this Spring book, you'll be able to develop, test, and deploy highly scalable, maintainable, and developer-friendly APIs to help your customers to transform their business.
Table of Contents (21 chapters)
1
Section 1: RESTful Web Services
7
Section 2: Security, UI, Testing, and Deployment
12
Section 3: gRPC, Logging, and Monitoring
16
Section 4: GraphQL

Chapter 4: Writing Business Logic for APIs

We discussed APIs using OpenAPI in the previous chapter. API interfaces and models were generated by the Swagger Codegen. In this chapter, you will implement the API's code in terms of both business logic and data persistence. You will write services and repositories for implementation and also add hypermedia and ETags to API responses. It is worth noting that the code provided only consists of the important lines and not the whole file in the interest of brevity. You can always access the links given below the code to view the complete file.

This chapter includes the following topics:

  • Overview of the service design
  • Adding repository components
  • Adding service components
  • Implementing hypermedia
  • Enhancing the controller with a service and HATEOAS
  • Adding ETags to API responses