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Introduction to Reactive principles with RxJava @AlexeyBuzdin Reactive 4TW!

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@AlexeyBuzdin Developer / Trainer at

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this page was intentionally left blank… Reactive

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Good?

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or Bad?

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Scary

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but Productive!

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reactive /rɪˈaktɪv/ 1. showing a response to a stimulus. "pupils are reactive to light" 2. acting in response to a situation rather than creating or controlling it. "a proactive rather than a reactive approach"

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reactive /rɪˈaktɪv/ 1. showing a response to a stimulus. "pupils are reactive to light" 2. acting in response to a situation rather than creating or controlling it. "a proactive rather than a reactive approach"

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Observer Observable Object

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Observer Observable Object

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Observer Observable Object

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Observer Observable Object

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Observable

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Observer

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Object(Event)

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programming with asynchronous data streams Reactive programming is

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List balls = Collections.singletonList(new Ball()); Observable pitcher = Observable.from(balls); Observer batter = new Observer() { @Override public void onCompleted() { /* Score! */ } @Override public void onError(Throwable e) { /* Shame */ } @Override public void onNext(Ball ball) { /* Hit! */ } }; pitcher.subscribe(batter);

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List balls = Collections.singletonList(new Ball()); Observable pitcher = Observable.from(balls); Observer batter = new Observer() { @Override public void onCompleted() { /* Score! */ } @Override public void onError(Throwable e) { /* Shame */ } @Override public void onNext(Ball ball) { /* Hit! */ } }; pitcher.subscribe(batter);

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List balls = Collections.singletonList(new Ball()); Observable pitcher = Observable.from(balls); Observer batter = new Observer() { @Override public void onCompleted() { /* Score! */ } @Override public void onError(Throwable e) { /* Shame */ } @Override public void onNext(Ball ball) { /* Hit! */ } }; pitcher.subscribe(batter);

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List balls = Collections.singletonList(new Ball()); Observable pitcher = Observable.from(balls); Observer batter = new Observer() { @Override public void onCompleted() { /* Score! */ } @Override public void onError(Throwable e) { /* Shame */ } @Override public void onNext(Ball ball) { /* Hit! */ } }; pitcher.subscribe(batter);

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List balls = /* Infinite balls */ Observable pitcher = Observable.from(balls); Observer batter = new Observer() { @Override public void onCompleted() { /* Score! */ } @Override public void onError(Throwable e) { /* Shame */ } @Override public void onNext(Ball ball) { /* Hit! */ } }; pitcher.subscribe(batter);

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programming with asynchronous data streams Reactive programming is

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Everything can be a Stream: - collections - user inputs - hardware - properties - caches - data structures - etc.

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Collections List< > balls = Lists.emptyList();

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Everything can be a Stream: - collections - user inputs - hardware - properties - caches - data structures - etc.

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UserInput Button btw = new Button(ctx); btn.setOnClickListener(e -> { // Do something })

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Everything can be a Stream: - collections - user inputs - hardware - properties - caches - data structures - etc.

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Hardware LocationManager mng = (LocationManager) getSystemService(Context.LOCATION_SERVICE); LocationListener listener = new LocationListener() { public void onLocationChanged(Location location) { // Do something } ….. }; locationManager.requestLocationUpdates (LocationManager.NETWORK_PROVIDER, 0, 0, listener);

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Everything can be a Stream: - collections - user inputs - hardware - properties - caches - data structures - etc.

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UserInput SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this); prefs.getBoolean("keystring", true);

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Everything can be a Stream: - collections - user inputs - hardware - properties - caches - data structures - etc.

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DataBase select().from(t).where(row(t.a, t.b).eq(1, 2));

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Everything can be a Stream: - collections - user inputs - hardware - properties - caches - data structures - etc.

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Data Structures

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Everything can be a Stream: - collections - user inputs - hardware - properties - caches - data structures - etc.

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…and what next?

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Operations!

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Operations! - map - filter - zip - groupBy - collect - flatMap - etc.

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RealLife RX RxView.clickEvents(tapBtn) .map(new Func1() { @Override public Integer call(ViewClickEvent onClickEvent) { log("GOT A TAP"); return 1; } }) .buffer(2, TimeUnit.SECONDS) .observeOn(AndroidSchedulers.mainThread()) .subscribe( /* Observer here */)

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programming with asynchronous data streams Reactive programming is

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programming with asynchronous data streams Reactive programming is

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RealLife RX

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Try it Out!

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Q&A