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Learning Spring Boot 2.0

You're reading from   Learning Spring Boot 2.0 Simplify the development of lightning fast applications based on microservices and reactive programming

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Product type Paperback
Published in Nov 2017
Publisher Packt
ISBN-13 9781786463784
Length 370 pages
Edition 2nd Edition
Languages
Tools
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Author (1):
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Greg L. Turnquist Greg L. Turnquist
Author Profile Icon Greg L. Turnquist
Greg L. Turnquist
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Table of Contents (11) Chapters Close

Preface 1. Quick Start with Java FREE CHAPTER 2. Reactive Web with Spring Boot 3. Reactive Data Access with Spring Boot 4. Testing with Spring Boot 5. Developer Tools for Spring Boot Apps 6. AMQP Messaging with Spring Boot 7. Microservices with Spring Boot 8. WebSockets with Spring Boot 9. Securing Your App with Spring Boot 10. Taking Your App to Production with Spring Boot

Pulling data through a Mono/Flux and chain of operations

We have wired up a repository to interface with MongoDB through Spring Data. Now we can start hooking it into our ImageService.

The first thing we need to do is inject our repository into the service, like this:

    @Service 
    public class ImageService { 
      ... 
      private final ResourceLoader resourceLoader; 
 
      private final ImageRepository imageRepository; 
 
      public ImageService(ResourceLoader resourceLoader, 
       ImageRepository imageRepository) { 
         this.resourceLoader = resourceLoader; 
         this.imageRepository = imageRepository; 
      } 
      ... 
    } 

In the previous chapter, we loaded Spring's ResourceLoader. In this chapter, we are adding ImageRepository to our constructor.

Previously, we looked up the names of the existing uploaded files, and constructed a Flux of Image...

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