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Reactive Programming in Spring 5
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Reactive Programming in Spring 5
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Presented at Dutch Spring Meetup on 19-11-2015.
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Reactive Programming in Spring 5
- Reactive Programming in Spring 5 Arjen Poutsma Pivotal
- About Arjen • Twenty years of experience in Enterprise Software Development • Joined SpringSource in 2005 • Development lead of Spring Web Services, Spring REST support, Spring Scala • Working on Spring 5
- Agenda • Reactive Systems • Reactive Streams • RxJava • Reactor • Reactive Programming in Spring 5
- Reactive Systems
- Reactive Manifesto Responsive Message Driven ResilientElastic
- Reactive Manifesto • Responsive • Rapid • Consistent • Resilient • Replication • Isolation • Elastic • Scaling • No bottlenecks • Message Driven • Async • Back-pressure
- Reactive Streams
- Reactive Streams Spec • Focus on Interoperability • No operators • Wide support • Akka,Vert.x, RxJava, Ratpack • JDK 9 Flow in java.util.concurrent
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- Publisher Subscribersubscribe onSubscribe Subscription request onNext onComplete onError
- Hot & Cold Cold Hot Passive Active Publish when subscribed Publish regardless Queue Mouse Movement
- Operators • map, flatMap, take, subscribe, … • No Operators in Reactive Streams • Left to implementations
- Reactor
- Project Reactor • Stream extends Publisher • Wrap Publisher
- Reactor Streams.just('a' 'b' 'c') .take(2) .map(Character::toUpperCase) .consume(System.out::println);
- RxJava
- RxJava • Based On Reactive Extensions • Ported to many languages • Rx.NET, RxJava, RxJS, ... • Native support for Reactive Streams coming in 2.x
- RxJava Observable.just('a', 'b', 'c') .take(2) .map(Character::toUpperCase) .subscribe(System.out::println)
- RxNetty • RxJava on top of Netty • Client/server for TCP and HTTP • Backpressure support
- Spring 5
- Spring Reactive • Experimental work for Spring 5 • Non-blocking runtimes: • Netty, Jetty,Tomcat, (Undertow) • RxJava, Reactor https://github.com/spring-projects/spring-reactive
- public interface ServerHttpRequest { HttpMethod getMethod(); URI getURI(); InputStream getBody(); } public interface ServerHttpResponse { void setStatusCode(HttpStatus status); OutputStream getBody(); } HttpMessage
- public interface ReactiveServerHttpRequest { HttpMethod getMethod(); URI getURI(); Publisher<ByteBuffer> getBody(); } public interface ServerHttpResponse { void setStatusCode(HttpStatus status); Publisher<void> setBody(Publisher<ByteBuffer> body); } Reactive HttpMessage
- Reactive Wep App Web Service Data
- Wanted: Reactiveness • JDBC • MySQL • Postgres • NoSQL • MongoDB • HTTP Client • OkHttp • Spring 5 • …
- Reactor @RequestMapping("/capitalize") @ResponseBody public Stream<Person> capitalize( @RequestBody Stream<Person> persons) { return persons.map(person -> { person.setName(person.getName().toUpperCase()); return person; }); }
- RxJava @RequestMapping("/capitalize") @ResponseBody public Observable<Person> capitalize( @RequestBody Observable<Person> persons) { return persons.map(person -> { person.setName(person.getName().toUpperCase()); return person; }); }
- More Spring! Spring Meetup http://www.meetup.com/Dutch-Spring- Meetup/ Spring Track GOTO Amsterdam 2016 http://gotoams.com
- Q & A https://github.com/spring-projects/spring-reactive
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