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Reactor 3.0, a reactive foundation for java 8 and Spring

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Stéphane Maldini
Stéphane Maldini

An introduction to the new facilities of Reactor 3 and its core focus : consumable Reactive Streams for Java 8.

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Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Reactor 3. 
 Reactive Foundation for Java 8 and Spring Stephane Maldini @smaldini
Reactive ?
Reactive ?
Publisher Subscriber Reactive Streams
 reactive-streams.org
Publisher Subscriber Reactive Streams
 reactive-streams.org Standard definition
Publisher Subscriber Reactive Streams
 reactive-streams.org Standard definition 0..N Data 
 + 0..1 (Error | Complete)
Publisher Subscriber Backpressure Reactive Streams
 reactive-streams.org Standard definition 0..N Data 
 + 0..1 (Error | Complete)
Publisher Subscriber Backpressure Reactive Streams
 reactive-streams.org Standard definition 0..N Data 
 + 0..1 (Error | Complete)
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Reactor Core provides for a minimalist set of Reactive Streams ready 
 generators and transformers 4
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Reactor Core provides for a minimalist set of Reactive Streams ready 
 generators and transformers 4 WHY ?
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 5 DIY Reactive Streams Publisher<User> rickSanchez = userRepository.findUser(“rick”);
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 5 DIY Reactive Streams Publisher<User> rickSanchez = userRepository.findUser(“rick”); Produce User when ready
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 5 DIY Reactive Streams Publisher<User> rickSanchez = userRepository.findUser(“rick”); Might produce 0, 1 or N Users ! Produce User when ready
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 5 DIY Reactive Streams Publisher<User> rickSanchez = userRepository.findUser(“rick”); Might produce 0, 1 or N Users ! Produce User when ready rickSanchez.subscribe(new Subscriber<User>(){ … });
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 5 DIY Reactive Streams Publisher<User> rickSanchez = userRepository.findUser(“rick”); Might produce 0, 1 or N Users ! Produce User when ready Callback for start, result, error or complete rickSanchez.subscribe(new Subscriber<User>(){ … });
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ DIY Reactive Streams 6
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ DIY Reactive Streams 6 Can I have an API ?
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ DIY Reactive Streams - top issues • Should Work with RS TCK • Address reentrance • Address thread safety • Address efficiency • Address state • For Many-To-One flows, implement your own merging operation • For One-To-Many lows, implement your own broadcasting operation • …. 7
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ DIY Reactive Streams - top issues • Should Work with RS TCK • Address reentrance • Address thread safety • Address efficiency • Address state • For Many-To-One flows, implement your own merging operation • For One-To-Many lows, implement your own broadcasting operation • …. 7
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 8
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 3 years to mature 9 R e a c t i v e S t r e a m s C o m m o n s I P C A D D O N S S p r i n g R x C O R E 2013: 1.x 2014: 2.x 2016: 3.0
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 3 years to mature 9 R e a c t i v e S t r e a m s C o m m o n s I P C A D D O N S S p r i n g R x C O R E Existential questions 2013: 1.x 2014: 2.x 2016: 3.0
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 3 years to mature 9 R e a c t i v e S t r e a m s C o m m o n s I P C A D D O N S S p r i n g R x C O R E Existential questions 2013: 1.x 2014: 2.x 2016: 3.0 Microservices become the norm
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 3 years to mature 9 R e a c t i v e S t r e a m s C o m m o n s I P C A D D O N S S p r i n g R x C O R E Existential questions 2013: 1.x 2014: 2.x 2016: 3.0 Microservices become the norm Rocky style revival
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 3x Influences and Collaborations 10 R e a c t i v e S t r e a m s C o m m o n s I P C A D D O N S S p r i n g R x C O R E
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 3x Influences and Collaborations 10 R e a c t i v e S t r e a m s C o m m o n s I P C A D D O N S S p r i n g R x C O R E
Flux
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Flux.just("red", "white", "blue")
 .flatMap(carRepository::findByColor)
 .collect(Result::new, Result::add)
 .doOnNext(Result::stop)
 .subscribe(doWithResult); A smarter Publisher ? Flux ! 12
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Flux.just("red", "white", "blue")
 .flatMap(carRepository::findByColor)
 .collect(Result::new, Result::add)
 .doOnNext(Result::stop)
 .subscribe(doWithResult); A smarter Publisher ? Flux ! 12 interface CarRepository { Flux<Car> findByColor(String color); }
Mono
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Mono, push/pull CompletionStage 14 Mono.delayMillis(3000)
 .map(d -> "Spring 4")
 .or(Mono.delayMillis(2000).map(d -> "Spring 5"))
 .then(t -> Mono.just(t+ " world"))
 .elapsed()
 .block();
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Mono, push/pull CompletionStage 14 Mono.delayMillis(3000)
 .map(d -> "Spring 4")
 .or(Mono.delayMillis(2000).map(d -> "Spring 5"))
 .then(t -> Mono.just(t+ " world"))
 .elapsed()
 .block(); Non!
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Mono, push/pull CompletionStage 15 Mono.delayMillis(3000)
 .map(d -> "Spring 4")
 .or(Mono.delayMillis(2000).map(d -> "Spring 5"))
 .then(t -> Mono.just(t+ " world"))
 .elapsed()
 .subscribe();
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Mono, push/pull CompletionStage 15 Mono.delayMillis(3000)
 .map(d -> "Spring 4")
 .or(Mono.delayMillis(2000).map(d -> "Spring 5"))
 .then(t -> Mono.just(t+ " world"))
 .elapsed()
 .subscribe(); Oui!
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Non Blocking and RS types around 16 Type Semantic /Library Java 8 Reactive Streams /Java 9 RxJava1
 (java6) Reactor3
 (java8) RxJava2
 (java6) 0 or 1 result CompletableFuture<T> Publisher<T> Observable<T> Mono<T> Maybe<T> 0 or N results Publisher<T> Observable<T> Flux<T> Observable<T>
 Flowable<T> 1 result CompletableFuture<T> Publisher<T> Single<T> Mono<T> Single<T> No result CompletableFuture<Void> Publisher<Void> Completable Mono<Void> Completable *Reactive Streams types are in bold **Akka Streams is also a notable RS implementor
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 17 3x Simpler API
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ ONE JAR
 reactor-core.jar 17 3x Simpler API
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ ONE JAR
 reactor-core.jar 17 3x Simpler API
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ ONE JAR
 reactor-core.jar 17 3x Simpler API Where Flux and Mono live
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ ONE JAR
 reactor-core.jar 17 3x Simpler API Where Flux and Mono live Make task execution great again and FIFO
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Execution Model Freedom 18 Synchronous Asynchronous Scheduler / Scheduler.Worker
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Execution Model Freedom 19 Publisher Subscriber
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Execution Model Freedom 19 Publisher Subscriber Thread: MAIN Thread: MAIN
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Execution Model Freedom 20 Publisher Subscriber +publishOn()
 Thread: Worker A Thread: Worker A
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Execution Model Freedom 21 Publisher Subscriber Thread: Worker B +subscribeOn() Thread: Worker B
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Execution Model Freedom 22 Publisher Subscriber +publishOn()
 Thread: Worker A +subscribeOn() Thread: Worker B
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 3x more focus on Javadoc 23 http://projectreactor.io/core/docs/api
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Learning to Flux & Mono 24
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Learning to Flux & Mono 24 https://spring.io/blog/2016/06/07/notes-on- reactive-programming-part-i-the-reactive- landscape https://spring.io/blog/2016/06/13/notes-on- reactive-programming-part-ii-writing-some-code https://spring.io/blog/2016/07/20/notes-on- reactive-programming-part-iii-a-simple-http-server- application
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Learning to Flux & Mono 24 https://spring.io/blog/2016/06/07/notes-on- reactive-programming-part-i-the-reactive- landscape https://spring.io/blog/2016/06/13/notes-on- reactive-programming-part-ii-writing-some-code https://spring.io/blog/2016/07/20/notes-on- reactive-programming-part-iii-a-simple-http-server- application Just browse spring.io/blog already
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Bridge Existing Asynchronous Code Mono<String> response = Mono.create(sink -> {
 HttpListener listener = event -> {
 if (event.getResponseCode() >= 400) {
 sink.error(new RuntimeExeption("Failed"));
 } else {
 String body = event.getBody();
 if (body.isEmpty()) {
 sink.success();
 } else {
 sink.success(body.toLowerCase());
 }
 }
 };
 
 client.addListener(listener);
 
 emitter.setCancellation(() -> client.removeListener(listener));
 }); • 25
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Bridge Existing Asynchronous Code Mono<String> response = Mono.create(sink -> {
 HttpListener listener = event -> {
 if (event.getResponseCode() >= 400) {
 sink.error(new RuntimeExeption("Failed"));
 } else {
 String body = event.getBody();
 if (body.isEmpty()) {
 sink.success();
 } else {
 sink.success(body.toLowerCase());
 }
 }
 };
 
 client.addListener(listener);
 
 emitter.setCancellation(() -> client.removeListener(listener));
 }); • 25 Also exists for Flux of N items
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Debug Mode 26 215 Hooks.onOperator(op -> op.operatorStacktrace()); 216 try { 217 Mono.just(1) 218 .map(d -> { 219 throw new RuntimeException(); 220 }) 221 .filter(d -> true) 222 .timestamp() 223 .elapsed() 224 .map(d -> d) 225 .block(); 226 } 227 catch(Exception e){ 228 e.printStackTrace(); 229 } 230 finally { 231 Hooks.resetOnOperator(); 232 }
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Debug Mode 26 215 Hooks.onOperator(op -> op.operatorStacktrace()); 216 try { 217 Mono.just(1) 218 .map(d -> { 219 throw new RuntimeException(); 220 }) 221 .filter(d -> true) 222 .timestamp() 223 .elapsed() 224 .map(d -> d) 225 .block(); 226 } 227 catch(Exception e){ 228 e.printStackTrace(); 229 } 230 finally { 231 Hooks.resetOnOperator(); 232 } Capture stack for each operator declared after
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Debug Mode 26 215 Hooks.onOperator(op -> op.operatorStacktrace()); 216 try { 217 Mono.just(1) 218 .map(d -> { 219 throw new RuntimeException(); 220 }) 221 .filter(d -> true) 222 .timestamp() 223 .elapsed() 224 .map(d -> d) 225 .block(); 226 } 227 catch(Exception e){ 228 e.printStackTrace(); 229 } 230 finally { 231 Hooks.resetOnOperator(); 232 } Capture stack for each operator declared after Assembly trace from producer [reactor.core.publisher.MonoMapFuseable] : reactor.core.publisher.Mono.map(Mono.java:1795) reactor.HooksTest.testTrace2(HooksTest.java:218) Composition chain until failing Operator : |_ Mono.map(HooksTest.java:218) |_ Mono.filter(HooksTest.java:221) |_ Mono.timestamp(HooksTest.java:222) |_ Mono.elapsed(HooksTest.java:223) |_ Mono.map(HooksTest.java:224)
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Create Gateways to Flux And Mono 27 EmitterProcessor<Integer> processor = EmitterProcessor.create();
 
 int n = 100_000;
 processor.publishOn(Schedulers.single())
 .subscribe(someService::handleData);
 
 BlockingSink<Integer> session = processor.connectSink();
 
 for (int i = 0; i < n; i++) {
 while (!session.emit(i).isOk()) {
 if (session.hasFailed()) {
 throw session.getError();
 } //fake throttling Thread.sleep(1);
 }
 }
 session.finish(); • EmitterProcessor
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Create Gateways to Flux And Mono 27 EmitterProcessor<Integer> processor = EmitterProcessor.create();
 
 int n = 100_000;
 processor.publishOn(Schedulers.single())
 .subscribe(someService::handleData);
 
 BlockingSink<Integer> session = processor.connectSink();
 
 for (int i = 0; i < n; i++) {
 while (!session.emit(i).isOk()) {
 if (session.hasFailed()) {
 throw session.getError();
 } //fake throttling Thread.sleep(1);
 }
 }
 session.finish(); • EmitterProcessor Backpressure Companion
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ EmitterProcessor<Integer> processor = EmitterProcessor.create();
 
 int n = 100_000;
 processor.publishOn(Schedulers.single())
 .subscribe(someService::handleData);
 
 BlockingSink<Integer> session = processor.connectSink();
 
 for (int i = 0; i < n; i++) {
 while (!session.emit(i).isOk()) {
 if (session.hasFailed()) {
 throw session.getError();
 } Thread.sleep(1); //fake throttling
 }
 }
 session.finish(); • Create Gateways to Flux And Mono 28 EmitterProcessor
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Operation Fusion • Reactor has a mission to limit the overhead in stack and message passing • 2 key categories : • “Macro Fusion” : merge operators in one (assembly time) • “Micro Fusion” : avoid queue creation and short circuit where possible request lifecycle. 29
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Starve CPU’s with ParallelFlux… 30 Flux.range(1, 100000)
 .parallel(3)
 .runOn(Schedulers.parallel())
 .collect(ArrayList::new, ArrayList::add)
 .sequential()
 .reduce(0, (a, b) -> a + b.size())
 .subscribeWith(TestSubscriber.create())
 .await(Duration.ofSeconds(5))
 .assertValues(100_000)
 .assertNoError()
 .assertComplete(); •
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Starve CPU’s with ParallelFlux… 30 Flux.range(1, 100000)
 .parallel(3)
 .runOn(Schedulers.parallel())
 .collect(ArrayList::new, ArrayList::add)
 .sequential()
 .reduce(0, (a, b) -> a + b.size())
 .subscribeWith(TestSubscriber.create())
 .await(Duration.ofSeconds(5))
 .assertValues(100_000)
 .assertNoError()
 .assertComplete(); • x3
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Efficient and micro bench ready 31 https://github.com/akarnokd/akarnokd-misc/tree/master/src/jmh/java/hu/akarnokd/comparison
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Efficient and micro bench ready 31 https://github.com/akarnokd/akarnokd-misc/tree/master/src/jmh/java/hu/akarnokd/comparison
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Efficient and micro bench ready 31 https://github.com/akarnokd/akarnokd-misc/tree/master/src/jmh/java/hu/akarnokd/comparison
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Bridge Fabulous RxJava 32
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Bridge Fabulous RxJava 32 RxJava1Adapter
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Bridge Java 9 Reactive Streams 33
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Bridge Java 9 Reactive Streams 33 JdkFlowAdapter
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Play with Reactor Core .NET 34
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Play with Reactor Core .NET 34 https://www.nuget.org/packages/Reactor.Core/
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Backpressure for JS: Reactor Core TypeScript 35
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Backpressure for JS: Reactor Core TypeScript 35 https://www.npmjs.com/package/reactor-core-js
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ EVERYTHING REACTIVE ? 36
µ Service A Data Cloud Messaging Web
Service B Message
 Broker Datastore 20 ms 50 ms 150 ms 250 ms 20 ms 15 ms 3 ms GATEWAY µ Service A
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Reactor Ecosystem roadmap 39 Reactor Netty Reactor IPC Spring Framework Spring 5, 
 Spring Cloud Stream, 
 Spring Integration,
 Spring Data, 
 Spring Boot, 
 Spring Cloud, 
 Spring Security,
 … Reactor Kafka Extra add-ons
 dashboard, bus, codecs, more operations & schedulers… Reactor Redis Reactor Aeron
Spring Framework 5
Spring Web MVC @Controller, @RequestMapping Servlet API Servlet Container
Spring Web MVC @Controller, @RequestMapping Servlet API Servlet Container Reactive Non-blocking …
Spring Web MVC Spring Web Reactive @Controller, @RequestMapping Servlet API Servlet Container
Spring Web MVC Spring Web Reactive @Controller, @RequestMapping Servlet API Servlet Container Reactive HTTP
Spring Web MVC Spring Web Reactive @Controller, @RequestMapping Servlet API Servlet Container Reactive HTTP Servlet 3.1 Container
Spring Web MVC Spring Web Reactive @Controller, @RequestMapping Servlet API Servlet Container Reactive HTTP Servlet 3.1 ContainerServlet 3.1, Netty
Spring Web MVC Spring Web Reactive @Controller, @RequestMapping Servlet API Servlet Container Reactive HTTP Servlet 3.1 ContainerServlet 3.1, Netty, Undertow
Non-Blocking HTTP GET
Non-Blocking HTTP POST
WebClient Scatter/Gather
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 51 SpringBootApplication
 @EnableBinding(Processor.class)
 public class WordCountApplication {
 
 @StreamListener
 @Output("output")
 public Flux<WordCount> countWords(@Input("input") Flux<String> words) {
 return words.window(ofSeconds(5), ofSeconds(1))
 .flatMap(window -> window.groupBy(word -> word)
 .flatMap(group -> group.reduce(0, (counter, word) -> counter + 1)
 .map(count -> new WordCount(group.key(), count))));
 } } Spring Cloud Stream: 
 Stateful processors
Boot Data Cloud IntegrationSecurity Reactive Efforts
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ @ProjectReactor http://github.com/reactor http://projectreactor.io Extra Slideware: www.slideshare.net/SpringCentral/imperative-to-reactive-web-applications www.slideshare.net/SpringCentral/designing-implementing-and-using-reactive-apis http://www.slideshare.net/RobHarrop/going-reactive-63425158

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Reactor 3.0, a reactive foundation for java 8 and Spring

  • 1. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Reactor 3. 
 Reactive Foundation for Java 8 and Spring Stephane Maldini @smaldini
  • 6. Publisher Subscriber Reactive Streams
 reactive-streams.org Standard definition 0..N Data 
 + 0..1 (Error | Complete)
  • 9. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Reactor Core provides for a minimalist set of Reactive Streams ready 
 generators and transformers 4
  • 10. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Reactor Core provides for a minimalist set of Reactive Streams ready 
 generators and transformers 4 WHY ?
  • 11. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 5 DIY Reactive Streams Publisher<User> rickSanchez = userRepository.findUser(“rick”);
  • 12. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 5 DIY Reactive Streams Publisher<User> rickSanchez = userRepository.findUser(“rick”); Produce User when ready
  • 13. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 5 DIY Reactive Streams Publisher<User> rickSanchez = userRepository.findUser(“rick”); Might produce 0, 1 or N Users ! Produce User when ready
  • 14. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 5 DIY Reactive Streams Publisher<User> rickSanchez = userRepository.findUser(“rick”); Might produce 0, 1 or N Users ! Produce User when ready rickSanchez.subscribe(new Subscriber<User>(){ … });
  • 15. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 5 DIY Reactive Streams Publisher<User> rickSanchez = userRepository.findUser(“rick”); Might produce 0, 1 or N Users ! Produce User when ready Callback for start, result, error or complete rickSanchez.subscribe(new Subscriber<User>(){ … });
  • 16. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ DIY Reactive Streams 6
  • 17. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ DIY Reactive Streams 6 Can I have an API ?
  • 18. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ DIY Reactive Streams - top issues • Should Work with RS TCK • Address reentrance • Address thread safety • Address efficiency • Address state • For Many-To-One flows, implement your own merging operation • For One-To-Many lows, implement your own broadcasting operation • …. 7
  • 19. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ DIY Reactive Streams - top issues • Should Work with RS TCK • Address reentrance • Address thread safety • Address efficiency • Address state • For Many-To-One flows, implement your own merging operation • For One-To-Many lows, implement your own broadcasting operation • …. 7
  • 20. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 8
  • 21. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 3 years to mature 9 R e a c t i v e S t r e a m s C o m m o n s I P C A D D O N S S p r i n g R x C O R E 2013: 1.x 2014: 2.x 2016: 3.0
  • 22. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 3 years to mature 9 R e a c t i v e S t r e a m s C o m m o n s I P C A D D O N S S p r i n g R x C O R E Existential questions 2013: 1.x 2014: 2.x 2016: 3.0
  • 23. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 3 years to mature 9 R e a c t i v e S t r e a m s C o m m o n s I P C A D D O N S S p r i n g R x C O R E Existential questions 2013: 1.x 2014: 2.x 2016: 3.0 Microservices become the norm
  • 24. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 3 years to mature 9 R e a c t i v e S t r e a m s C o m m o n s I P C A D D O N S S p r i n g R x C O R E Existential questions 2013: 1.x 2014: 2.x 2016: 3.0 Microservices become the norm Rocky style revival
  • 25. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 3x Influences and Collaborations 10 R e a c t i v e S t r e a m s C o m m o n s I P C A D D O N S S p r i n g R x C O R E
  • 26. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 3x Influences and Collaborations 10 R e a c t i v e S t r e a m s C o m m o n s I P C A D D O N S S p r i n g R x C O R E
  • 27. Flux
  • 28. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Flux.just("red", "white", "blue")
 .flatMap(carRepository::findByColor)
 .collect(Result::new, Result::add)
 .doOnNext(Result::stop)
 .subscribe(doWithResult); A smarter Publisher ? Flux ! 12
  • 29. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Flux.just("red", "white", "blue")
 .flatMap(carRepository::findByColor)
 .collect(Result::new, Result::add)
 .doOnNext(Result::stop)
 .subscribe(doWithResult); A smarter Publisher ? Flux ! 12 interface CarRepository { Flux<Car> findByColor(String color); }
  • 30. Mono
  • 31. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Mono, push/pull CompletionStage 14 Mono.delayMillis(3000)
 .map(d -> "Spring 4")
 .or(Mono.delayMillis(2000).map(d -> "Spring 5"))
 .then(t -> Mono.just(t+ " world"))
 .elapsed()
 .block();
  • 32. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Mono, push/pull CompletionStage 14 Mono.delayMillis(3000)
 .map(d -> "Spring 4")
 .or(Mono.delayMillis(2000).map(d -> "Spring 5"))
 .then(t -> Mono.just(t+ " world"))
 .elapsed()
 .block(); Non!
  • 33. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Mono, push/pull CompletionStage 15 Mono.delayMillis(3000)
 .map(d -> "Spring 4")
 .or(Mono.delayMillis(2000).map(d -> "Spring 5"))
 .then(t -> Mono.just(t+ " world"))
 .elapsed()
 .subscribe();
  • 34. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Mono, push/pull CompletionStage 15 Mono.delayMillis(3000)
 .map(d -> "Spring 4")
 .or(Mono.delayMillis(2000).map(d -> "Spring 5"))
 .then(t -> Mono.just(t+ " world"))
 .elapsed()
 .subscribe(); Oui!
  • 35. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Non Blocking and RS types around 16 Type Semantic /Library Java 8 Reactive Streams /Java 9 RxJava1
 (java6) Reactor3
 (java8) RxJava2
 (java6) 0 or 1 result CompletableFuture<T> Publisher<T> Observable<T> Mono<T> Maybe<T> 0 or N results Publisher<T> Observable<T> Flux<T> Observable<T>
 Flowable<T> 1 result CompletableFuture<T> Publisher<T> Single<T> Mono<T> Single<T> No result CompletableFuture<Void> Publisher<Void> Completable Mono<Void> Completable *Reactive Streams types are in bold **Akka Streams is also a notable RS implementor
  • 36. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 17 3x Simpler API
  • 37. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ ONE JAR
 reactor-core.jar 17 3x Simpler API
  • 38. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ ONE JAR
 reactor-core.jar 17 3x Simpler API
  • 39. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ ONE JAR
 reactor-core.jar 17 3x Simpler API Where Flux and Mono live
  • 40. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ ONE JAR
 reactor-core.jar 17 3x Simpler API Where Flux and Mono live Make task execution great again and FIFO
  • 41. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Execution Model Freedom 18 Synchronous Asynchronous Scheduler / Scheduler.Worker
  • 42. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Execution Model Freedom 19 Publisher Subscriber
  • 43. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Execution Model Freedom 19 Publisher Subscriber Thread: MAIN Thread: MAIN
  • 44. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Execution Model Freedom 20 Publisher Subscriber +publishOn()
 Thread: Worker A Thread: Worker A
  • 45. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Execution Model Freedom 21 Publisher Subscriber Thread: Worker B +subscribeOn() Thread: Worker B
  • 46. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Execution Model Freedom 22 Publisher Subscriber +publishOn()
 Thread: Worker A +subscribeOn() Thread: Worker B
  • 47. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 3x more focus on Javadoc 23 http://projectreactor.io/core/docs/api
  • 48. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Learning to Flux & Mono 24
  • 49. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Learning to Flux & Mono 24 https://spring.io/blog/2016/06/07/notes-on- reactive-programming-part-i-the-reactive- landscape https://spring.io/blog/2016/06/13/notes-on- reactive-programming-part-ii-writing-some-code https://spring.io/blog/2016/07/20/notes-on- reactive-programming-part-iii-a-simple-http-server- application
  • 50. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Learning to Flux & Mono 24 https://spring.io/blog/2016/06/07/notes-on- reactive-programming-part-i-the-reactive- landscape https://spring.io/blog/2016/06/13/notes-on- reactive-programming-part-ii-writing-some-code https://spring.io/blog/2016/07/20/notes-on- reactive-programming-part-iii-a-simple-http-server- application Just browse spring.io/blog already
  • 51. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Bridge Existing Asynchronous Code Mono<String> response = Mono.create(sink -> {
 HttpListener listener = event -> {
 if (event.getResponseCode() >= 400) {
 sink.error(new RuntimeExeption("Failed"));
 } else {
 String body = event.getBody();
 if (body.isEmpty()) {
 sink.success();
 } else {
 sink.success(body.toLowerCase());
 }
 }
 };
 
 client.addListener(listener);
 
 emitter.setCancellation(() -> client.removeListener(listener));
 }); • 25
  • 52. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Bridge Existing Asynchronous Code Mono<String> response = Mono.create(sink -> {
 HttpListener listener = event -> {
 if (event.getResponseCode() >= 400) {
 sink.error(new RuntimeExeption("Failed"));
 } else {
 String body = event.getBody();
 if (body.isEmpty()) {
 sink.success();
 } else {
 sink.success(body.toLowerCase());
 }
 }
 };
 
 client.addListener(listener);
 
 emitter.setCancellation(() -> client.removeListener(listener));
 }); • 25 Also exists for Flux of N items
  • 53. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Debug Mode 26 215 Hooks.onOperator(op -> op.operatorStacktrace()); 216 try { 217 Mono.just(1) 218 .map(d -> { 219 throw new RuntimeException(); 220 }) 221 .filter(d -> true) 222 .timestamp() 223 .elapsed() 224 .map(d -> d) 225 .block(); 226 } 227 catch(Exception e){ 228 e.printStackTrace(); 229 } 230 finally { 231 Hooks.resetOnOperator(); 232 }
  • 54. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Debug Mode 26 215 Hooks.onOperator(op -> op.operatorStacktrace()); 216 try { 217 Mono.just(1) 218 .map(d -> { 219 throw new RuntimeException(); 220 }) 221 .filter(d -> true) 222 .timestamp() 223 .elapsed() 224 .map(d -> d) 225 .block(); 226 } 227 catch(Exception e){ 228 e.printStackTrace(); 229 } 230 finally { 231 Hooks.resetOnOperator(); 232 } Capture stack for each operator declared after
  • 55. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Debug Mode 26 215 Hooks.onOperator(op -> op.operatorStacktrace()); 216 try { 217 Mono.just(1) 218 .map(d -> { 219 throw new RuntimeException(); 220 }) 221 .filter(d -> true) 222 .timestamp() 223 .elapsed() 224 .map(d -> d) 225 .block(); 226 } 227 catch(Exception e){ 228 e.printStackTrace(); 229 } 230 finally { 231 Hooks.resetOnOperator(); 232 } Capture stack for each operator declared after Assembly trace from producer [reactor.core.publisher.MonoMapFuseable] : reactor.core.publisher.Mono.map(Mono.java:1795) reactor.HooksTest.testTrace2(HooksTest.java:218) Composition chain until failing Operator : |_ Mono.map(HooksTest.java:218) |_ Mono.filter(HooksTest.java:221) |_ Mono.timestamp(HooksTest.java:222) |_ Mono.elapsed(HooksTest.java:223) |_ Mono.map(HooksTest.java:224)
  • 56. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Create Gateways to Flux And Mono 27 EmitterProcessor<Integer> processor = EmitterProcessor.create();
 
 int n = 100_000;
 processor.publishOn(Schedulers.single())
 .subscribe(someService::handleData);
 
 BlockingSink<Integer> session = processor.connectSink();
 
 for (int i = 0; i < n; i++) {
 while (!session.emit(i).isOk()) {
 if (session.hasFailed()) {
 throw session.getError();
 } //fake throttling Thread.sleep(1);
 }
 }
 session.finish(); • EmitterProcessor
  • 57. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Create Gateways to Flux And Mono 27 EmitterProcessor<Integer> processor = EmitterProcessor.create();
 
 int n = 100_000;
 processor.publishOn(Schedulers.single())
 .subscribe(someService::handleData);
 
 BlockingSink<Integer> session = processor.connectSink();
 
 for (int i = 0; i < n; i++) {
 while (!session.emit(i).isOk()) {
 if (session.hasFailed()) {
 throw session.getError();
 } //fake throttling Thread.sleep(1);
 }
 }
 session.finish(); • EmitterProcessor Backpressure Companion
  • 58. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ EmitterProcessor<Integer> processor = EmitterProcessor.create();
 
 int n = 100_000;
 processor.publishOn(Schedulers.single())
 .subscribe(someService::handleData);
 
 BlockingSink<Integer> session = processor.connectSink();
 
 for (int i = 0; i < n; i++) {
 while (!session.emit(i).isOk()) {
 if (session.hasFailed()) {
 throw session.getError();
 } Thread.sleep(1); //fake throttling
 }
 }
 session.finish(); • Create Gateways to Flux And Mono 28 EmitterProcessor
  • 59. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Operation Fusion • Reactor has a mission to limit the overhead in stack and message passing • 2 key categories : • “Macro Fusion” : merge operators in one (assembly time) • “Micro Fusion” : avoid queue creation and short circuit where possible request lifecycle. 29
  • 60. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Starve CPU’s with ParallelFlux… 30 Flux.range(1, 100000)
 .parallel(3)
 .runOn(Schedulers.parallel())
 .collect(ArrayList::new, ArrayList::add)
 .sequential()
 .reduce(0, (a, b) -> a + b.size())
 .subscribeWith(TestSubscriber.create())
 .await(Duration.ofSeconds(5))
 .assertValues(100_000)
 .assertNoError()
 .assertComplete(); •
  • 61. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Starve CPU’s with ParallelFlux… 30 Flux.range(1, 100000)
 .parallel(3)
 .runOn(Schedulers.parallel())
 .collect(ArrayList::new, ArrayList::add)
 .sequential()
 .reduce(0, (a, b) -> a + b.size())
 .subscribeWith(TestSubscriber.create())
 .await(Duration.ofSeconds(5))
 .assertValues(100_000)
 .assertNoError()
 .assertComplete(); • x3
  • 62. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Efficient and micro bench ready 31 https://github.com/akarnokd/akarnokd-misc/tree/master/src/jmh/java/hu/akarnokd/comparison
  • 63. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Efficient and micro bench ready 31 https://github.com/akarnokd/akarnokd-misc/tree/master/src/jmh/java/hu/akarnokd/comparison
  • 64. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Efficient and micro bench ready 31 https://github.com/akarnokd/akarnokd-misc/tree/master/src/jmh/java/hu/akarnokd/comparison
  • 65. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Bridge Fabulous RxJava 32
  • 66. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Bridge Fabulous RxJava 32 RxJava1Adapter
  • 67. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Bridge Java 9 Reactive Streams 33
  • 68. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Bridge Java 9 Reactive Streams 33 JdkFlowAdapter
  • 69. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Play with Reactor Core .NET 34
  • 70. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Play with Reactor Core .NET 34 https://www.nuget.org/packages/Reactor.Core/
  • 71. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Backpressure for JS: Reactor Core TypeScript 35
  • 72. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Backpressure for JS: Reactor Core TypeScript 35 https://www.npmjs.com/package/reactor-core-js
  • 73. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ EVERYTHING REACTIVE ? 36
  • 75. Service B Message
 Broker Datastore 20 ms 50 ms 150 ms 250 ms 20 ms 15 ms 3 ms GATEWAY µ Service A
  • 76. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ Reactor Ecosystem roadmap 39 Reactor Netty Reactor IPC Spring Framework Spring 5, 
 Spring Cloud Stream, 
 Spring Integration,
 Spring Data, 
 Spring Boot, 
 Spring Cloud, 
 Spring Security,
 … Reactor Kafka Extra add-ons
 dashboard, bus, codecs, more operations & schedulers… Reactor Redis Reactor Aeron
  • 78. Spring Web MVC @Controller, @RequestMapping Servlet API Servlet Container
  • 79. Spring Web MVC @Controller, @RequestMapping Servlet API Servlet Container Reactive Non-blocking …
  • 80. Spring Web MVC Spring Web Reactive @Controller, @RequestMapping Servlet API Servlet Container
  • 81. Spring Web MVC Spring Web Reactive @Controller, @RequestMapping Servlet API Servlet Container Reactive HTTP
  • 82. Spring Web MVC Spring Web Reactive @Controller, @RequestMapping Servlet API Servlet Container Reactive HTTP Servlet 3.1 Container
  • 83. Spring Web MVC Spring Web Reactive @Controller, @RequestMapping Servlet API Servlet Container Reactive HTTP Servlet 3.1 ContainerServlet 3.1, Netty
  • 84. Spring Web MVC Spring Web Reactive @Controller, @RequestMapping Servlet API Servlet Container Reactive HTTP Servlet 3.1 ContainerServlet 3.1, Netty, Undertow
  • 88. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 51 SpringBootApplication
 @EnableBinding(Processor.class)
 public class WordCountApplication {
 
 @StreamListener
 @Output("output")
 public Flux<WordCount> countWords(@Input("input") Flux<String> words) {
 return words.window(ofSeconds(5), ofSeconds(1))
 .flatMap(window -> window.groupBy(word -> word)
 .flatMap(group -> group.reduce(0, (counter, word) -> counter + 1)
 .map(count -> new WordCount(group.key(), count))));
 } } Spring Cloud Stream: 
 Stateful processors
  • 89. Boot Data Cloud IntegrationSecurity Reactive Efforts
  • 90. Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ @ProjectReactor http://github.com/reactor http://projectreactor.io Extra Slideware: www.slideshare.net/SpringCentral/imperative-to-reactive-web-applications www.slideshare.net/SpringCentral/designing-implementing-and-using-reactive-apis http://www.slideshare.net/RobHarrop/going-reactive-63425158