Book Image

Spring 5.0 By Example

By : Claudio Eduardo de Oliveira
Book Image

Spring 5.0 By Example

By: Claudio Eduardo de Oliveira

Overview of this book

With growing demands, organizations are looking for systems that are robust and scalable. Therefore, the Spring Framework has become the most popular framework for Java development. It not only simplifies software development but also improves developer productivity. This book covers effective ways to develop robust applications in Java using Spring. The book has three parts, where each one covers the building of a comprehensive project in Java and Spring. In the first part, you will construct a CMS Portal using Spring's support for building REST APIs. You will also learn to integrate these APIs with AngularJS and later develop this application in a reactive fashion using Project Reactor, Spring WebFlux, and Spring Data. In the second part, you’ll understand how to build a messaging application, which will consume the Twitter API and perform filtering and transformations. Here, you will also learn about server-sent events and explore Spring’s support for Kotlin, which makes application development quick and efficient. In the last part, you will build a real microservice application using the most important techniques and patterns such as service discovery, circuit breakers, security, data streams, monitoring, and a lot more from this architectural style. By the end of the book, you will be confident about using Spring to build your applications.

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Table of Contents (17 chapters)
Title Page
Title Page
Copyright and Credits
Copyright and Credits
Dedication
Dedication
Packt Upsell
Packt Upsell
Contributors
Contributors
Preface
Preface
Free Chapter
1
Journey to the Spring World
Journey to the Spring World
Spring modularity
Setting up our development environment
Summary
2
Starting in the Spring World – the CMS Application
Starting in the Spring World – the CMS Application
Creating the CMS application structure
Running the application
Creating the REST resources
Adding service layer
Integrate with AngularJS
Summary
3
Persistence with Spring Data and Reactive Fashion
Persistence with Spring Data and Reactive Fashion
Learning the basics of Docker
Spring Data project
Creating the final data access layer
Creating the Docker image for CMS
Putting in Reactive fashion
Summary
4
Kotlin Basics and Spring Data Redis
Kotlin Basics and Spring Data Redis
Learning Kotlin basics
Wrapping it up
Creating the project
Running the Redis instance
Understanding Redis
Spring Data Reactive Redis
Creating a Twitter application
Testing APIs
Summary
5
Reactive Web Clients
Reactive Web Clients
Creating the Twitter Gathering project
Starting the RabbitMQ server with Docker
Spring Messaging AMQP
Enabling Twitter in our application
Spring reactive web clients
Changing the Tracked Hashtag Service
Testing the microservices' integrations
Spring Actuator
Summary
6
Playing with Server-Sent Events
Playing with Server-Sent Events
Creating the Tweet Dispatcher project
Server-Sent Events
Reactor RabbitMQ
Filtering streams
Dockerizing the whole solution
Running the containerized solution
The docker-compose tool
Summary
7
Airline Ticket System
Airline Ticket System
The Airline Ticket System
Spring Cloud Config Server
Spring Cloud service discovery
Spring Cloud Zipkin server and Sleuth
Spring Cloud Gateway
Putting the infrastructure on Docker
Summary
8
Circuit Breakers and Security
Circuit Breakers and Security
Understanding the service discovery power
Flights microservice
When the services fail, hello Hystrix
Spring Boot Admin
Spring Cloud Zuul
Summary
9
Putting It All Together
Putting It All Together
The airline Bookings microservice
The airline Payments microservice
Learning about the Turbine server
Hystrix Dashboard
Creating the Mail microservice
Creating the Authentication microservice
Monitoring the microservices
Dockerizing the microservices
Running the system
Summary
Other Books You May Enjoy
Other Books You May Enjoy
Leave a review - let other readers know what you think
Index
Index

Adding service layer

Now, we have the skeleton for the REST layer ready, and in this section, we will start to create a service layer for our application. We will show how the Dependency Injection works under the hood, learn the stereotype annotations on Spring Framework and also start to think about our persistence storage, which will be presented in the next section.

Changes in the model

We need to make some changes to our model, specifically in the News class. In our business rules, we need to keep our information safe, then we need to review all the news. We will add some methods to add a new review done by a user, and also we will add a method to check if the news was reviewed by all mandatory reviewers.

Adding a new review

For this feature, we need to create a method in our News class, the method will return a Review and should look like this:

public Review review(String userId,String status){
  final Review review = new Review(userId, status);
  this.reviewers.add(review);
  return review...
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