Book Image

Spring 5.0 Cookbook

By : Sherwin John C. Tragura
Book Image

Spring 5.0 Cookbook

By: Sherwin John C. Tragura

Overview of this book

The Spring framework has been the go-to framework for Java developers for quite some time. It enhances modularity, provides more readable code, and enables the developer to focus on developing the application while the underlying framework takes care of transaction APIs, remote APIs, JMX APIs, and JMS APIs. The upcoming version of the Spring Framework has a lot to offer, above and beyond the platform upgrade to Java 9, and this book will show you all you need to know to overcome common to advanced problems you might face. Each recipe will showcase some old and new issues and solutions, right from configuring Spring 5.0 container to testing its components. Most importantly, the book will highlight concurrent processes, asynchronous MVC and reactive programming using Reactor Core APIs. Aside from the core components, this book will also include integration of third-party technologies that are mostly needed in building enterprise applications. By the end of the book, the reader will not only be well versed with the essential concepts of Spring, but will also have mastered its latest features in a solution-oriented manner.
Table of Contents (20 chapters)
Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Implementing the Subscriber<T> interface


Publishers cannot be executed without a Subscriber. There are a few ways to implement a subscriber and it depends on the type of publisher they are to connect to. This recipe will provide some snippets on how to instantiate a subscriber and implement its callback events.

Getting ready

This recipe will be utilizing the same ch08 to highlight the different implementation of Subscriber<T>.

How to do it...

To render or retrieve the emitted data, a subscription API must be created. Perform the following steps on how to implement Subscriber<T>:

  1. Create a test class TestEmployeeNativeStreamservice that will verify some of the methods in the previous EmployeeNativeStreamservice. Add the following test method that executes processFormUser() using Subscriber<T> implemented through java.util.function.Consumer<T>:
@RunWith(SpringJUnit4ClassRunner.class) 
@WebAppConfiguration 
@ContextConfiguration(classes = {  
SpringDbConfig.class, SpringDispatcherConfig...