RxJava - Getting Started

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RxJava Getting Started Brice Dutheil / David Wursteisen

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Brice Dutheil @BriceDutheil Indep, Devoxx France, Hackergarten Paris Qui sommes nous ? David Wursteisen @dwursteisen

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Il était une fois...

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Il était une fois...

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Systèmes distribués

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Systèmes distribués

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Systèmes distribués

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Systèmes distribués

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Systèmes distribués The Internet

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Systèmes distribués

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Systèmes distribués

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RxJava

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Obervable

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Obervable

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Obervable

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Obervable

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Observable Observable.from(1, 2, 3, 4)

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Observable Observable.from(1, 2, 3, 4) Observable.from(asyncTask.getFuture())

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Observable Observable.from(1, 2, 3, 4) Observable.from(asyncTask.getFuture()) Observable.range(1, 4400)

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Observable Observable.from(1, 2, 3, 4) Observable.from(asyncTask.getFuture()) Observable.range(1, 4400) Observable.timer(0, 5, TimeUnit.SECONDS)

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Observable Observable.from(1, 2, 3, 4) Observable.from(asyncTask.getFuture()) Observable.range(1, 4400) Observable.timer(0, 5, TimeUnit.SECONDS) Observable.create(...)

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Observable Observable.from(1, 2, 3, 4) Observable.from(asyncTask.getFuture()) Observable.range(1, 4400) Observable.timer(0, 5, TimeUnit.SECONDS) Observable.create(...) Observable.from(anIterable) Observable.just(73) Observable.error(new Exception()) Observable.empty() ...

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Observable Observable Observable Observable

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Subscriber Observable.range(1, 4400)

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

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

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

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

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

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

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Diagrammes Marble

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Diagrammes Marble

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Diagrammes Marble

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Diagrammes Marble

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Diagrammes Marble

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Diagrammes Marble

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Diagrammes Marble

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Diagrammes Marble

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Opérateurs Observable.from(1, 2, 3, 4)

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Opérateurs Observable.from(1, 2, 3, 4) .filter(predicate)

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Opérateurs Observable.from(1, 2, 3, 4) .filter((i) -> (i % 2) == 0)

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Opérateurs Observable.from(1, 2, 3, 4) .filter((i) -> (i % 2) == 0) .subscribe(System.out::println)

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Opérateurs Observable.from(1, 2, 3, 4) .filter((i) -> (i % 2) == 0) .subscribe(System.out::println)

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Opérateurs Observable.from(1, 2, 3, 4) .filter((i) -> (i % 2) == 0) .subscribe(System.out::println) 2

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Opérateurs Observable.from(1, 2, 3, 4) .filter((i) -> (i % 2) == 0) .subscribe(System.out::println) 2 4

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

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

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Opérateurs Observable.from(1, 2, 3, 4) .map((i) -> i * 10) .subscribe(System.out::println);

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Opérateurs Observable.from(1, 2, 3, 4) .map((i) -> i * 10) .subscribe(System.out::println); 10 20 30 40

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Composition

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Composition

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Composition

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Composition couleurs formes

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

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Programmation synchrone main

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

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Programmation asynchrone Computation IO UI main source

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Programmation asynchrone Computation IO UI main source ... .subscribeOn(Schedulers.io())

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Programmation asynchrone Computation IO UI main source .take(...) .subscribeOn(Schedulers.io())

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Programmation asynchrone Computation IO UI main .delay(..., Schedulers.computation())

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Programmation asynchrone Computation IO UI main .delay(..., Schedulers.computation()) .map(...)

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Programmation asynchrone Computation IO UI main .observeOn(Schedulers.from(...)) .map(...)

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Programmation asynchrone Computation IO UI main .observeOn(Schedulers.from(...)) .map(...) .subscribe(...)

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Programmation asynchrone 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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Programmation asynchrone 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())