Reactive Web Development with Spring Boot 2
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Slides from the June 11, 2018 session for Capital Area Software Engineers: https://www.meetup.com/CapitalAreaSoftwareEngineers/events/251354746/
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Reactive Web Development with Spring Boot 2
- 1. REACTIVE WEB DEVELOPMENT WITH SPRING BOOT 2 Mike Melusky - @mrjavascript June 11, 2018 – Capital Area Software Engineers (CASE)
- 2. About Speaker • Michael Melusky • Software Developer and College Instructor • Xbox One / PS4 gaming • Meat smoking/grilling
- 3. About the session • This is a talk on Java and Spring • Ideally was hoping to delve more into JDK 10 • The main goal is to highlight the new “reactive web” features in Spring Framework 5 / Spring Boot 2 • Personally manage number of Spring applications: • JDK 1.8.171 • Spring Boot 1.5.X • Spring MVC • Ultimately need to upgrade these to use Spring Boot 2
- 6. What is Spring Framework? • Spring Framework is a application framework for the Java platform • It’s also an excellent IoC (Inversion of Controller) container too! • https://start.spring.io
- 7. SPRING IS AWESOME FORYOUR RESTFUL API
- 8. Spring Framework release history • Spring Framework 3 • Released in 2010 • Spring Framework 4 • Released in 2014 • Spring Boot 1.0 • Released in 2014 • Spring Boot 1.5 • Released in 2017 • Spring Framework 5 • Released GA in 2017 • Spring Boot 2.0 • Released GA in 2018
- 9. Spring Framework v. Boot • If we used the analogy of a recipe: • Spring Framework contains the ingredients • Spring Boot is the casserole
- 10. Spring Boot 2 • New features in Spring Boot 2: • Only supports Java 8 and up • Java 9 support is not on the 1.x branch! • Improved development features (logging, monitoring, metrics) • Everything is secured (including actuator endpoints and static resources) • The main new feature the Reactive Support in Spring Boot 2 • WebFlux • Reactive counterparts for MongoDB, Redis, Cassandra
- 12. Reactive Programming • Another paradigm, like object-oriented programming or functional programming, or procedural programming • For starters read the Reactive Manifesto: • https://www.reactivemanifesto.org
- 14. Reactive Manifesto • Responsive: • System responds in timely matter • Resilient: • System stays responsive regardless of failure • Elastic: • System stays responsive under varying workload • Message Driven: • Relies on asynchronous message passing to establish a boundary between components
- 15. Takeaway points • Reactive Programming is all about non-blocking applications that are asynchronous and event-driven and require a small number of threads to scale • TL;DR: asynchronous, message passing is heavily used
- 19. Spring MVC • Classical Model-View-Controller framework for building web applications • Features: • @Controller / @RestController • @RequestMapping • ModelAndView • Creating a spring app using start.spring.io • ** DEMO **
- 21. Reactive StreamsAPI • Spring Framework 5 embraces the Reactive Streams specification API: • Adopted in java 9 via java.util.concurrent.Flow • Reactive Streams is 4 interfaces: • Publisher • Subscriber • Subscription • - one to one lifecycle of a subscriber subscribing to a publisher • Processor • – represents a processing stage between publisher and subscriber
- 22. PUBLISHER
- 23. SUBSCRIBER
- 24. SUBSCRIPTION
- 25. PROCESSOR
- 26. Spring ReactiveWeb Framework • Uses Reactor under the hood (implementation of Reactive Streams API) • Reactor extends the implementation with the following: • Mono: • Implements Publisher and returns 0 or 1 elements • Flux: • Implements Publisher and returns N elements
- 28. Building a Spring ReactiveWebApp • Two ways of handling routes: • “Traditional” • Uses @Controller/@RestController • “Functional” • Uses request handlers • ** DEMO **
- 30. RestTemplate • RestTemplate can be used to make blocking HTTP requests in your Spring Application • With WebFlux, a non-blocking class named WebClient was introduced
- 31. RESTTEMPLATE
- 32. WEBCLIENT
- 33. WEBCLIENT
- 34. FINAL POINTS ON SPRING REACTIVE WEB
- 36. Worth it going full reactive? • Troubleshooting a Reactive application is a bit difficult, and there is the possibility that, while fixing an issue, you might accidentally block code has been introduced. • Most of the traditional Java-based integration libraries are still blocking. • Limited options are available for Reactive data stores, except for a few NoSQL databases such as MongoDB. • Spring Security is still not supported.
- 39. Performance Benefits • Source: https://dev.to/bufferings/springboot2-blocking-web-vs-reactive-web-46jn
- 40. REFERENCES
- 41. References • Reactive Manifesto: • https://www.reactivemanifesto.org • SpringWeb Reactive Framework: • https://docs.spring.io/spring-framework/docs/5.0.0.M1/spring-framework- reference/html/web-reactive.html • Spring Framework Guru: “Reactive Streams in Java” • https://springframework.guru/reactive-streams-in-java/
- 42. Thank you for coming • Code on MS GitHub, Slides on SlideShare: • @mrjavascript