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Getting Started RxJava David Wursteisen 16 Octobre 2014

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David Wursteisen @dwursteisen Direction Expertise Innovation

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David Wursteisen

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Architecture distribuée Sync/Async/Concurrence

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Architecture distribuée

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Architecture distribuée

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Architecture distribuée The Internet

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Architecture distribuée The Internet

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Synchrone

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Synchrone Appel bloquant

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Asynchrone

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Asynchrone Appel non bloquant

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Complexité

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Complexité future.get();

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Complexité future1.get(); future2.get(); future3.get(); future4.get(); future5.get(); future6.get(); future7.get();

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Complexité future1.get(); future2.get(); future3.get(); future4.get(); future5.get(); future6.get(); future7.get(); Ordonnancement optimal ?

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Complexité client.execute(new Callback() { @Override public void completed(HttpResponse response) { } });

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Complexité client.execute(new Callback() { @Override public void completed(HttpResponse response) { client.execute(new Callback() { @Override public void completed(HttpResponse response) { } }); } });

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Complexité client.execute(new Callback() { @Override public void completed(HttpResponse response) { client.execute(new Callback() { @Override public void completed(HttpResponse response) { client.execute(new Callback() { @Override public void completed(HttpResponse response) { } }); } });

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Complexité client.execute(new Callback() { @Override public void completed(HttpResponse response) { client.execute(new Callback() { @Override public void completed(HttpResponse response) { client.execute(new Callback() { @Override public void completed(HttpResponse response) { } }); } }); Callback hell

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Concurrence

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Concurrence

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Concurrence Concurrence

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Concurrence

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Concurrence RxJava permet de manipuler des évènements d’une manière synchrone et/ou asynchrone.

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Historique Il était une fois...

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Historique

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Historique

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Historique

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Historique

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Historique ReactiveX.io

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Observables Travailler avec des flux

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Flux d’évènements fini Évènements Fin du flux

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Flux d’évènements en erreur Évènements Erreur

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Flux d’évènements infini Évènements

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Flux d’évènements Observable.never() Observable.empty() Observable.just(1) Observable.from(1, 2, 3) Observable.range(1, 4400) Observable.timer(5, TimeUnit.SECONDS) Observable.create(...)

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Flux d’évènements Observable.never() Observable.empty() Observable.just(1) Observable.from(1, 2, 3) Observable.range(1, 4400) Observable.timer(5, TimeUnit.SECONDS) Observable.create(...)

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Flux d’évènements Observable.never() Observable.empty() Observable.just(1) Observable.from(1, 2, 3) Observable.range(1, 4400) Observable.timer(5, TimeUnit.SECONDS) Observable.create(...) 1

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Flux d’évènements Observable.never() Observable.empty() Observable.just(1) Observable.from(1, 2, 3) Observable.range(1, 4400) Observable.timer(5, TimeUnit.SECONDS) Observable.create(...) 1 2 3

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Flux d’évènements Observable.never() Observable.empty() Observable.just(1) Observable.from(1, 2, 3) Observable.range(1, 4400) Observable.timer(5, TimeUnit.SECONDS) Observable.create(...) 1 4400

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Flux d’évènements Observable.never() Observable.empty() Observable.just(1) Observable.from(1, 2, 3) Observable.range(1, 4400) Observable.timer(5, TimeUnit.SECONDS) Observable.create(...) 0 t t + 5 secondes

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Flux d’évènements Observable.never() Observable.empty() Observable.just(1) Observable.from(1, 2, 3) Observable.range(1, 4400) Observable.timer(5, TimeUnit.SECONDS) Observable.create(...) A C

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Flux d’évènements λ ϕ φ json json json Observable Observable Observable

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Observer Push des données

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Observer OnNext* (OnCompleted|OnError)?

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Observer OnNext* (OnCompleted|OnError)?

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Observer OnNext* (OnCompleted|OnError)?

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Observer OnNext* (OnCompleted|OnError)?

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Observer Observable.range(1, 4400)

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Observer Observable.range(1, 4400).subscribe()

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Observer Observable.range(1, 4400).subscribe(onNext)

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Observer Observable.range(1, 4400).subscribe(System.out::println)

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Observer Observable.range(1, 4400).subscribe(System.out::println, onError)

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Observer Observable.range(1, 4400).subscribe(System.out::println, System.err::println)

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Observer Observable.range(1, 4400).subscribe(System.out::println, System.err::println, onCompleted)

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Observer Observable.range(1, 4400).subscribe(System.out::println, System.err::println, () -> System.out.println(“finished”))

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Manipulation d’évènements Quand l’écoute ne suffit plus

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Manipulation d’évènements 0 1

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Manipulation d’évènements 0 1 map

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Manipulation d’évènements 0 1 A B map

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Manipulation d’évènements 1 4

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Manipulation d’évènements 1 4 filter ( x <= 2 )

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Manipulation d’évènements 1 4 1 filter ( x <= 2 )

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Manipulation d’évènements 1 2

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Manipulation d’évènements 1 2 delay ( 5, SECONDS )

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Manipulation d’évènements 1 2 1 delay ( 5, SECONDS ) 2

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Manipulation d’évènements Observable.from(0, 1, 2, 3, 4) Observable

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Manipulation d’évènements Observable.from(0, 1, 2, 3, 4) .filter((i) -> i < 3) Observable Observable

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Manipulation d’évènements Observable.from(0, 1, 2, 3, 4) .filter((i) -> i < 3) .delay(5, TimeUnit.SECONDS) Observable Observable Observable

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Manipulation d’évènements Observable.from(0, 1, 2, 3, 4) .filter((i) -> i < 3) .delay(5, TimeUnit.SECONDS) .map((i) -> Character.toString((char)(i + 'A'))) Observable Observable Observable Observable

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Manipulation d’évènements Observable.from(0, 1, 2, 3, 4) .filter((i) -> i < 3) .delay(5, TimeUnit.SECONDS) .map((i) -> Character.toString((char)(i + 'A'))) .subscribe(System.out::println); Observable Observable Observable Observable

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Manipulation d’évènements Observable.from(0, 1, 2, 3, 4) .filter((i) -> i < 3) .delay(5, TimeUnit.SECONDS) .map((i) -> Character.toString((char)(i + 'A'))) .subscribe(System.out::println); 0, 1, 2, 3, 4 => A, B, C Observable Observable Observable Observable

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Manipulation d’évènements

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Manipulation d’évènements

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Manipulation d’évènements

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Composition Création d’un flux à partir d’un ensemble de flux

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Composition

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Composition

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Composition

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Mise en pratique de composition Learn from the trenches

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Composition

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Composition

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Composition

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Composition

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Composition

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Composition merge

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Composition merge

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Composition

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Composition

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Composition zip

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Composition zip

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Subscription Et gestion de l’unsubscribe

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Subscription Observable.create(new OnSubscribe() { … });

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Subscription Observable.create(new OnSubscribe() { @Override public void call(Subscriber super T> s) { s.onNext(123); s.onCompleted(); } });

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Subscription Observable.create(new OnSubscribe() { @Override public void call(Subscriber super T> s) { s.onNext(123); s.onCompleted(); } }); Émission synchronne

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Subscription Observable.create(new OnSubscribe() { @Override public void call(Subscriber super T> subscriber) { // ... httpClient.execute(httpRequest, new FutureCallback() { @Override public void completed(String content) { subscriber.onNext(content); subscriber.onCompleted(); } @Override public void failed(Exception e) { subscriber.onError(e); } }); } });

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Subscription Observable.create(new OnSubscribe() { @Override public void call(Subscriber super T> subscriber) { // ... httpClient.execute(httpRequest, new FutureCallback() { @Override public void completed(String content) { subscriber.onNext(content); subscriber.onCompleted(); } @Override public void failed(Exception e) { subscriber.onError(e); } }); } });

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Subscription Observable.create(new OnSubscribe() { @Override public void call(Subscriber super T> subscriber) { // ... httpClient.execute(httpRequest, new FutureCallback() { @Override public void completed(String content) { subscriber.onNext(content); subscriber.onCompleted(); } @Override public void failed(Exception e) { subscriber.onError(e); } }); } });

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Subscription Observable.create(new OnSubscribe() { @Override public void call(Subscriber super T> subscriber) { // ... httpClient.execute(httpRequest, new FutureCallback() { @Override public void completed(String content) { subscriber.onNext(content); subscriber.onCompleted(); } @Override public void failed(Exception e) { subscriber.onError(e); } }); } }); Émission asynchronne

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Subscription Observable.create(new OnSubscribe() { @Override public void call(Subscriber super T> subscriber) { // ... httpClient.execute(httpRequest, new FutureCallback() { @Override public void completed(String content) { subscriber.onNext(content); subscriber.onCompleted(); } @Override public void failed(Exception e) { subscriber.onError(e); } }); } }); Propagation des erreurs

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Subscription La souscription permet d’uniformiser des API différentes par leurs natures (Callback, etc...)

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Unsubscribe Subscription subscription = Observable.interval(1, TimeUnit.SECONDS).subscribe();

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Unsubscribe Subscription subscription = Observable.interval(1, TimeUnit.SECONDS).subscribe(); Souscription

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Unsubscribe Subscription subscription = Observable.interval(1, TimeUnit.SECONDS).subscribe(); Handler sur la souscription

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Unsubscribe Subscription subscription = Observable.interval(1, TimeUnit.SECONDS).subscribe(); /* ... */ subscription.unsubscribe();

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Unsubscribe Subscription subscription = Observable.interval(1, TimeUnit.SECONDS).subscribe(); /* ... */ subscription.unsubscribe(); Arrêt de la souscription

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Schedulers

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Schedulers observableReadingSynchronously(“strings.txt”) .take(10) .delay(1, SECONDS) .map(parse()) .map(n -> “=> ” + n)) .subscribe(to_the_view())

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Schedulers main

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Schedulers observableReadingSynchronously(“strings.txt”) .take(10) .delay(1, SECONDS) .map(parse()) .map(n -> “=> ” + n)) .subscribe(to_the_view())

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Schedulers Computation IO UI main

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Schedulers Computation IO UI main

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Schedulers Computation IO UI main

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Schedulers Computation IO UI main

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Schedulers Computation IO UI main

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Schedulers Computation IO UI main

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Schedulers observableReadingSynchronously(“strings.txt”) .subscribeOn(scheduler) .take(10) .delay(1, SECONDS, scheduler) .map(parse()) .observeOn(scheduler) .map(n -> “=> ” + n)) .subscribe(to_the_view())

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Schedulers observableReadingSynchronously(“strings.txt”) .subscribeOn(Schedulers.io()) .take(10) .delay(1, SECONDS, Schedulers.computation()) .map(parse()) .observeOn(Schedulers.from(uiExecutor())) .map(n -> “=> ” + n)) .subscribe(to_the_view())

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Schedulers UI Computation

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Schedulers UI Computation

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Schedulers UI Computation

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Schedulers UI Computation

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Schedulers UI Computation

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Hot & Cold Observable

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Cold Observable Observable obs = Observable.from(1, 2, 3, 4); obs.subscribe(System.out::println); obs.subscribe(System.out::println);

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Cold Observable Observable obs = Observable.from(1, 2, 3, 4); obs.subscribe(System.out::println); obs.subscribe(System.out::println);

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Cold Observable Observable obs = Observable.from(1, 2, 3, 4); obs.subscribe(System.out::println); obs.subscribe(System.out::println); Subscribe

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Cold Observable Observable obs = Observable.from(1, 2, 3, 4); obs.subscribe(System.out::println); obs.subscribe(System.out::println); Subscribe

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Cold Observable Observable obs = Observable.from(1, 2, 3, 4); obs.subscribe(System.out::println); obs.subscribe(System.out::println); Souscription différente

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Hot Observable ConnectableObservable obs = Observable.from(1, 2, 3, 4).publish(); obs.subscribe(System.out::println); obs.subscribe(System.out::println); obs.connect();

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Hot Observable ConnectableObservable obs = Observable.from(1, 2, 3, 4).publish(); obs.subscribe(System.out::println); obs.subscribe(System.out::println); obs.connect();

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Hot Observable ConnectableObservable obs = Observable.from(1, 2, 3, 4).publish(); obs.subscribe(System.out::println); obs.subscribe(System.out::println); obs.connect();

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Hot Observable ConnectableObservable obs = Observable.from(1, 2, 3, 4).publish(); obs.subscribe(System.out::println); obs.subscribe(System.out::println); obs.connect();

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Hot Observable ConnectableObservable obs = Observable.from(1, 2, 3, 4).publish(); obs.subscribe(System.out::println); obs.subscribe(System.out::println); obs.connect();

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Hot Observable ConnectableObservable obs = Observable.from(1, 2, 3, 4).publish(); obs.subscribe(System.out::println); obs.subscribe(System.out::println); obs.connect(); Subscribe

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Hot Observable ConnectableObservable obs = Observable.from(1, 2, 3, 4).publish(); obs.subscribe(System.out::println); obs.subscribe(System.out::println); obs.connect(); Partage la même souscription

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Hot Observable ConnectableObservable obs = Observable.from(1, 2, 3, 4).publish(); obs.subscribe(System.out::println); obs.subscribe(System.out::println); obs.connect();

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Hot Observable ConnectableObservable obs = Observable.from(1, 2, 3, 4).publish(); obs.connect(); obs.subscribe(System.out::println); obs.subscribe(System.out::println); Souscription

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Cold & Hot Observable Cold Observable = flux passif Hot Observable = flux actif

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Back Pressure Contrôler la production

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Back Pressure Production

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Back Pressure Production buffer

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Back Pressure Production Pression arrière

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Back Pressure Production Pression arrière Demande de production de n élements

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Retour d’expérience

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Opérateurs Observable.from(1, 2, 3, 4) .reduce(new LinkedList(), (seed, value) -> { seed.add(value); return seed; }) .first() .subscribe(System.out::println);

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Opérateurs Observable.from(1, 2, 3, 4) .reduce(new LinkedList(), (seed, value) -> { seed.add(value); return seed; }) .first() .subscribe(System.out::println);

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Opérateurs Observable.from(1, 2, 3, 4) .toList() .first() .subscribe(System.out::println);

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Opérateurs Observable.from(1, 2, 3, 4) .toList() .first() .subscribe(System.out::println);

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Opérateurs Observable.from(1, 2, 3, 4) .toList() .first() .subscribe(System.out::println); Différence entre first() / single() / take(1) ?

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Gestion des erreurs Observable.from(1, 2, 3, 4) .toList() .single() .subscribe(System.out::println);

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Gestion des erreurs Observable.from(1, 2, 3, 4) .toList() .single() .subscribe(System.out::println); Notification des erreurs absentes

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Gestion des erreurs static { RxJavaPlugins.getInstance().registerErrorHandler(new RxJavaErrorHandler() { @Override public void handleError(Throwable e) { e.printStackTrace(); } }); }

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Lambda & Java 8 Observable.from(1, 2, 3, 4) .filter(new Func1() { @Override public Boolean call(Integer i) { return i > 3; } }) .subscribe(new Action1() { @Override public void call(Integer x) { System.out.println(x); } });

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Lambda & Java 8 Observable.from(1, 2, 3, 4) .filter(new Func1() { @Override public Boolean call(Integer i) { return i > 3; } }) .subscribe(new Action1() { @Override public void call(Integer x) { System.out.println(x); } }); Bruit

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Lambda & Java 8 Observable.from(1, 2, 3, 4) .filter(i -> i > 3) .subscribe(System.out::println);

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Lambda & Java 8 Observable.from(1, 2, 3, 4) .filter(new Func1() { @Override public Boolean call(Integer i) { return i > 3; } }) .subscribe(new Action1() { @Override public void call(Integer x) { System.out.println(x); } }); Observable.from(1, 2, 3, 4) .filter(i -> i > 3) .subscribe(System.out::println); Retrolambda

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Concurrence obs1.mergeWith(obs2) .take(5) .subscribe(System.out::println);

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Concurrence obs1.mergeWith(obs2) .take(5) .subscribe(System.out::println);

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Concurrence obs1.mergeWith(obs2) .take(5) .subscribe(System.out::println); Doit gérer la concurrence

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Concurrence obs1.mergeWith(obs2) .take(5) .subscribe(System.out::println);

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Concurrence obs1.mergeWith(obs2) .take(5) .subscribe(System.out::println); non concurrence

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Sync & Async Observable generator();

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Sync & Async Observable generator(); Sync ?

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Sync & Async Observable generator(); Sync ? Async ?

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Sync & Async Observable generator(); Sync ? Async ? Computation ?

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Sync & Async Observable generator(); Sync ? Async ? Computation ? Acteur ?

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“Leak” des Observables everything is an event

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“Leak” des Observables ViewPager

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“Leak” des Observables ViewPager Preferences Observable

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“Leak” des Observables ViewPager Preferences UserService Observable Observable

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Future

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Future Support RxJava

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Reactive Streams

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Reactive Streams Reactive Streams is an initiative to provide a standard for asynchronous stream processing with non-blocking back pressure on the JVM. http://www.reactive-streams.org/

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Reactive Streams RxJava | Akka Streams | Reactor Composable | Ratpack

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Reactive Streams RxJava | Akka Streams | Reactor Composable | Ratpack > 700 Ko | Java | Android

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Reactive Streams RxJava | Akka Streams | Reactor Composable | Ratpack > 2.5 Mo | Scala | Akka

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Reactive Streams RxJava | Akka Streams | Reactor Composable | Ratpack ~1Mo | Java | RingBufferDispatcher

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Reactive Streams RxJava | Akka Streams | Reactor Composable | Ratpack Java 8 | Http

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Si il ne fallait retenir qu’une chose

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Si il ne fallait retenir qu’une chose RxJava est un modèle de programmation pour écrire des applications asynchrones Frontend | Backend | Crossplatform

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Questions ? david.wursteisen@soat.fr @dwursteisen