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![Propagates during Subscription
[a=2,b=2]
[a=1,b=2]
[]
ctx.put(b,2)
[a=1]
ctx.put(a,1)
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Subscribe
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Project Reactor Now and Tomorrow
The document discusses the advancements and features of Project Reactor, especially the transition from version 3.0 to 3.1, emphasizing its improvements in API consistency, testing support, and enhanced customization for reactive programming. Key topics include the introduction of new hooks, the refinement of Flux and Mono interfaces, and the ongoing development of related libraries like Reactor Netty and Reactor Kafka. It also outlines future plans and contributors to the project, highlighting its growing role in the reactive programming ecosystem.
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Project Reactor Now and Tomorrow
- 1. © Copyright 2017Pivotal Software, Inc. All rights Reserved. Version 1.0 Stéphane MALDINI Simon BASLÉ Project Reactor Now & Tomorrow SpringOne Platform 2017
- 2. Stéphane Maldini Senior ProductManager & Lead Engineer Project Reactor, Pivotal & @smaldini Simon Baslé @simonbasle Staff Software Engineer Project Reactor, Pivotal
- 3.
- 4. Is this abig deal ? Spoiler: yes
- 5. Reactor 3.0 Versioning scheme:ERA.MAJOR.MINOR Production ready, but had to be out before Spring Framework 5 Still room for evolution after plenty of feedback
- 6. Project ____ Downloads : >300k/month projectreactor.io : > 30k unique/month Gitter.im : #7 Java channel
- 7. Project ____ 452 ClosedPull Requests 487 Closed Issues 11 Releases 53 Contributors 4 (+2) Core Committers
- 8. Shoutout to ourContributors
- 9. Why users wantReactor ?
- 10. Why users wantReactor ? Reactive Streams sample extract reactive-streams.org
- 11. Why users wantReactor ? Flux.range(from, count)
- 12. Do you speak ReactiveStreams ?
- 13. Reactor and ReactiveStreams
- 14.
- 15.
- 16.
- 17.
- 18. Subscriber<T> void onNext(T) void onComplete() voidonError(Throwable)
- 19.
- 20.
- 21. Subscriber<T> void onSubscribe(Subscription) void onNext(T) voidonComplete() void onError(Throwable)
- 22.
- 23.
- 25.
- 27. String res; for(int i= 1; i <= 1000; i++) { res = blockingHttpGet(“/quote/”+i); handleBody(res); } Without --------
- 28. String res; for(int i= 1; i <= 1000; i++) { res = blockingHttpGet(“/quote/”+i); handleBody(res); } 1000 calls later... Main Thread Without --------
- 29. Flux.range(1, 1000) .flatMap(i ->reactiveHttpCall("/quote/"+i)) .subscribe(this::handleBody); With --------
- 30. Flux.range(1, 1000) .flatMap(i ->reactiveHttpCall("/quote/"+i)) .subscribe(this::handleBody); operator With --------
- 31. Flux.range(1, 1000) .flatMap(i ->reactiveHttpCall("/quote/"+i)) .subscribe(this::handleBody); 1 call later Main Thread With --------
- 32. Flux.range(1, 1000) .flatMap(i ->reactiveHttpCall("/quote/"+i)) .subscribe(this::handleBody); 256 http calls With --------
- 33. Flux.range(1, 1000) .flatMap(i ->reactiveHttpCall("/quote/"+i), 1) .subscribe(this::handleBody); With -------- 1 http call
- 34. Flux.range(1, 1000) .flatMap(i ->reactiveHttpCall("/quote/"+i), 1) .subscribe(this::handleBody); With -------- J-j-jeez Rick, I like this backpressure stuff 1 http call
- 35. At every stage, Fluxand Mono are Publisher
- 36. interface SomeReactiveApi { Flux<T>findUsersLike(Publisher<String> usernames) } //... someReactiveApi.findUsersLike(Mono.just(“ricksanchez”)) .subscribe(handleUsers); Everywhere
- 37. interface SomeReactiveApi { Flux<T>findUsersLike(Publisher<String> usernames) } //... someReactiveApi.findUsersLike(Mono.just(“ricksanchez”)) .subscribe(handleUsers); //or someReactiveApi.findUsersLike(someFlux.filter(“sanchez”::endsWith)) .subscribe(handleUsers); Everywhere
- 38. interface SomeReactiveApi { Flux<T>findUsersLike(Publisher<String> usernames) } //... someReactiveApi.findUsersLike(Mono.just(“ricksanchez”)) .subscribe(handleUsers); //or someReactiveApi.findUsersLike(someFlux.filter(“sanchez”::endsWith)) .subscribe(handleUsers); Everywhere Look Morty, the universe wants API consistency !
- 39. Reactor Core 3.1 Hot fromthe oven
- 40.
- 41. 3.1 is apolished programming experience
- 42. Flux Mono Aligning APIsbetween Flux and Mono
- 43.
- 44.
- 45.
- 47.
- 48. “Reactor has matured, layingout the foundations for frameworks and users to integrate their context into the Core .” Enterprise Ready: Hooks & Customization, Matured API
- 49.
- 50. Scannable Visit the hierarchyof operators Scan at each step for Attributes... … either upstream (parents()) or downstream (actuals())
- 51. Tagging and Naming givea chain of operator a name give a chain of operator attributes
- 52. Tagging and Naming Flux.range(1,10) .name("myRange") .tag("createdBy", "rick");
- 53. Hooks On last operator instantiationbefore subscribe On every operator instantiation
- 54. Hooks.onLastOperator( Operators.lift(scannable -> scannable.tags() .anyMatch(t ->t.getT1() .contains("createdBy")), (scannable, subscriber) -> { fooService.registerOwnedFlux(scannable); return subscriber; })); Hooks
- 55. Hooks.onLastOperator( Operators.lift(scannable -> scannable.tags() .anyMatch(t ->t.getT1() .contains("createdBy")), (scannable, subscriber) -> { fooService.registerOwnedFlux(scannable); return subscriber; })); Hooks Once every stream... Only visit streams containing tag... Notify some service with the stream reference and return the operator subscriber
- 56. Possible Application: Metrics E.g.tag a Flux with “METRICS” and a framework could pick that up and add an operator that increments counters/timers...
- 57.
- 58. reactor-test StepVerifier to assertexpectations on any Publisher TestPublisher to simulate a reactive source PublisherProbe to check which path was used in complex chains
- 59. StepVerifier StepVerifier.withVirtualTime( () -> Flux.interval(Duration.ofSeconds(45)).take(2)) .thenAwait(Duration.ofSeconds(50)) .expectNext(0L) .thenAwait(Duration.ofSeconds(40)) .assertNext(v-> assertThat(v).isGreaterThan(0L)) .expectComplete() .verify();
- 60. TestPublisher TestPublisher.create() .next(1, 2, 3,4) .complete(); TestPublisher.createNonCompliant(Violation.ALLOW_NULLS) .emit(1, 2, 3, null, 4); next() + complete()
- 61. PublisherProbe probe = PublisherProbe.of(Flux.range(1,10)); reactiveConditionalPath(Mono.just(1), probe.flux()) .subscribe(); probe.assertWasSubscribed(); PublisherProbe
- 62.
- 63. Immutable Context a =Context.of(“key”, “value”); Context b = a.put(“key”, “value2”); a.get(“key”); // ⇒ “value” b.get(“key”); // ⇒ “value2”
- 64. Propagates during Subscription [a=2,b=2] [a=1,b=2] [] ctx.put(b,2) [a=1] ctx.put(a,1) )subscribe(Subscriber Subscribe & Context Data ctx.put(a,2)
- 65. See Reference Guidefor Snippets like this: String key = "message"; Mono<String> r = Mono.just("Hello") .subscriberContext(ctx -> ctx.put(key,"World")) .flatMap( s -> Mono .subscriberContext() .map(ctx -> s + " " + ctx.getOrDefault(key, "Stranger")) ); StepVerifier.create(r) .expectNext("Hello Stranger") .verifyComplete();
- 66. More about BismuthRelease https://spring.io/blog/2017/09/28/reactor-bismuth-is-out Executive summary of latest 3.1 additions
- 67. What’s new inThe Ecosystem ? In-house or community grown initiatives
- 68.
- 69. Reactor Netty onlyturns Netty into a Reactive Streams ready bridge
- 70. Just a fewthreads for a production-ready volume of connections with various latencies writeread select worker worker worker
- 71. Non Blocking TCP,UDP and HTTP Decouples Read and Write Pauses reading on local Backpressure Pauses local producing on Backpressure
- 72. Webflux WebClient Cloud Gateway Boot 2.0 Usedand Distributed by Spring
- 73.
- 74.
- 75.
- 76. Seriously, it’s 0.7.2. Itruns well. But we’re polishing API before 0.8.0.M1 Best to use--------
- 77.
- 78. Publish & Consumemessages from Kafka... … with a backpressure-ready Reactive API https://github.com/reactor/reactor-kafka Reactor-Kafka
- 79. Reactor-Kafka KafkaSender.create() .send(Flux.range(1, 10) .map(i -> SenderRecord.create(topic,partition, timestamp, i, "msg_" + i,i))) .subscribe();
- 80.
- 81. Reactor-RabbitMQ Publish & Consumemessages from RabbitMQ... … with a backpressure-ready Reactive API https://github.com/reactor/reactor-rabbitmq
- 82.
- 83.
- 84. Reactor-Addons Extend Reactor CoreAPI Adapt Reactor to different execution contracts https://github.com/reactor/reactor-addons
- 85. Retry Support Factory methodsthat provide a fluent API to incrementally configure a Function suitable for Flux.retryWhen. (tip: use static import) Retry.allBut(Class<Exception>...) Retry.any() Retry.anyOf(Class<Exception>...) Retry.onlyIf(Predicate)
- 86.
- 87. Math Take a Flux<Number>and apply operations to its whole set of elements using MathFlux static methods. Mono<Long> sum = Flux.range(1, 10) .as(MathFlux::sumLong);
- 88. Math (with kotlin) Mono<Long>sum = Flux.range(1, 10) .sumLong();
- 89. An opinionated abstractionthat helps you store and lookup a Mono or a Flux to/from a cache. CacheMono will store the Mono value or completion as a Signal. CacheFlux will collect the elements and terminal event as a List<Signal>. Both only work with finite sources. Cache Support
- 90. Mono<Integer> test = CacheMono.lookup(reader(data),"foo") .onCacheMissResume(() -> Mono.just(1L)) .andWriteWith(writer(data)); Reader and writer interfaces to adapt to any type of cache implementation + out-of-the-box variant for Map. Cache Support
- 91.
- 92. Spring Ecosystem #1 userand source of feedback
- 95.
- 97.
- 98. Lettuce http://lettuce.io A Reactor-based reactivedriver for Redis
- 99.
- 100. CloudFoundry Java Client https://github.com/cloudfoundry/cf-java-client Theofficial Java client for CloudFoundry API
- 101.
- 102.
- 103.
- 104.
- 105.
- 106.
- 107.
- 108.
- 109.
- 110.
- 111.
- 112.
- 113.
- 114.
- 115. NowFlux.range(0, 3) .flatMap(v ->Mono.just(v) .map(i -> 100 / i) .doOnError(...) .onErrorResume( Mono.empty() ) ); processing that can fail your face when you read this code
- 116. TomorrowFlux.range(0, 3) .map(i ->100 / i) .errorStrategyContinue() .filter(i -> 100 / i > 4); this is not impacted and can still fail this is protected by this
- 117.
- 118.
- 119. Sleuth & Zipkin Currentlyfocusing on tracing WebFlux and WebClient any guess as to why these are different? flatMap concatMap
- 120.
- 121. API iteration release: 0.8.x Immutable server and client builders Lifecycle and interceptor API (doOnRequest...) Initial user guide
- 122. API iteration release: 0.8.x HttpClient.prepare() .port(c.address().getPort()) .wiretap() .get() .uri("/test/test.css") .responseContent() .asString() .reduce(String::concat) .subscribe(System.out::println);
- 123. Beyond 0.8 HTTP 2support Plug-And-Play Metrics Connection Pool improvements Backpressure strategies
- 124.
- 125. Java 9 continuously improvesupport
- 126. Java 9 continuously improvesupport RSocket
- 127. Exploring RSocket (rsocket.io) Duplexflow-control support Multi-transport and multi-language Decoupled from any serialization Contributors from Facebook
- 128.
- 129.
- 130.
- 131.
- 132. Just Wondering Flux BuffersLifecycle Hooks ? Persistent Flux ? Coordinated demand ?
- 134. What do youneed ?
- 135.
- 136.