New in Spring Framework 5.0: Functional Web Framework
•
12 likes•2,917 views
In Spring Framework 5.0, we introduced a new, functional web framework, next to the existing annotation-driven programming model. In this talk, we will discuss this new framework: how it is used, what its goals are, how it compares to the annotation model, and other related topics. Presenter : Arjen Poutsma, Pivotal
Report
Share
New in Spring Framework 5.0: Functional Web Framework
- 1. © 2017 Pivotal New in Spring 5: Functional Web Framework Arjen Poutsma Pivotal
- 2. © 2017 Pivotal About Arjen •Twenty years of experience in Enterprise Software Development •Joined SpringSource in 2005 •Development lead of Spring Web Services, Spring MVC, Spring Scala •Working on Spring 5
- 3. © 2017 Pivotal I do like annotations...
- 4. © 2017 Pivotal ...but there are downsides •“Magic” •No link between data and behavior •Reflection •Performance •Type Erasure
- 5. © 2017 Pivotal Design Goals •Functional Style •java.util.function •java.util.stream •More library; less framework •Explicit •Customizable •No reflection
- 6. © 2017 Pivotal Functional Programming (in Java 8)
- 7. © 2017 Pivotal Immutability •No change after construction •Builders •Thread-safety •e.g. String •toUpperCase() •StringBuilder
- 8. © 2017 Pivotal First-class Functions •Functions as first-class citizens •Functions as arguments •Functions as return value •Reusability •e.g. String •indexOf(char) vs indexOf(Predicate<Char>)
- 9. © 2017 Pivotal Pure Functions •Same result given same arguments •No Limit side effects •Application boundaries •Testability •Cacheability •Parallelization
- 10. © 2017 Pivotal
- 12. © 2017 Pivotal Function<ServerRequest, Mono<? extends ServerResponse>> HandlerFunction
- 13. © 2017 Pivotal ServerRequest •Similar to RequestEntity •Immutable •Headers • Optional<MediaType> contentType() • List<String> header(String) •Body • Mono<T> bodyToMono(Class<T>)
- 14. © 2017 Pivotal ServerResponse •Similar to ResponseEntity •Immutable w/ Builder •Headers • lastModified(ZonedDateTime) • header(String, String...) •Body • body(Publisher<T>, Class<T>)
- 15. © 2017 Pivotal Function<ServerRequest, Mono<HandlerFunction<? extends ServerResponse>> RouterFunction
- 18. © 2017 Pivotal RequestPredicates •Common predicates •path •headers (Content-Type, Accept) •Build (compose) your own!
- 19. © 2017 Pivotal BiFunction<Request, HandlerFunction<? extends ServerResponse>, Mono<? extends ServerResponse>> HandlerFilterFunction
- 20. © 2017 Pivotal Running Router Functions • RouterFunction as @Bean in @EnableWebFlux class •Convert RouterFunction to HttpHandler •Reactor Netty •Tomcat •Servlet 3.1+ •Undertow
- 22. © 2017 Pivotal Summary •Handler functions handle request by returning a response •Router functions route to handler functions •Router functions can be filtered by filter functions •Router functions can be run in a reactive web runtime
- 23. © 2017 Pivotal Q & A Resources •Sample: https://github.com/poutsma/web-function-sample •Blog post: https://spring.io/blog/2016/09/22/new-in-spring-5- functional-web-framework •Kotlin: https://speakerdeck.com/sdeleuze/functional-web- applications-with-spring-and-kotlin •Reactor: http://projectreactor.io/learn