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January 7, 2019 13:18
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[Hello World] JavaServer Faces with rxJava #rxjava
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package learnrxjava.examples; | |
import java.util.concurrent.TimeUnit; | |
import rx.Observable; | |
import rx.Observable.OnSubscribe; | |
import rx.Subscriber; | |
import rx.schedulers.Schedulers; | |
public class HelloWorld { | |
public static void main(String[] args) { | |
// Hello World | |
Observable.create(subscriber -> { | |
subscriber.onNext("Hello World!"); | |
subscriber.onCompleted(); | |
}).subscribe(System.out::println); | |
// shorten by using helper method | |
Observable.just("Hello", "World!") | |
.subscribe(System.out::println); | |
// add onError and onComplete listeners | |
Observable.just("Hello World!") | |
.subscribe(System.out::println, | |
Throwable::printStackTrace, | |
() -> System.out.println("Done")); | |
// expand to show full classes | |
Observable.create(new OnSubscribe<String>() { | |
@Override | |
public void call(Subscriber<? super String> subscriber) { | |
subscriber.onNext("Hello World!"); | |
subscriber.onCompleted(); | |
} | |
}).subscribe(new Subscriber<String>() { | |
@Override | |
public void onCompleted() { | |
System.out.println("Done"); | |
} | |
@Override | |
public void onError(Throwable e) { | |
e.printStackTrace(); | |
} | |
@Override | |
public void onNext(String t) { | |
System.out.println(t); | |
} | |
}); | |
// add error propagation | |
Observable.create(subscriber -> { | |
try { | |
subscriber.onNext("Hello World!"); | |
subscriber.onCompleted(); | |
} catch (Exception e) { | |
subscriber.onError(e); | |
} | |
}).subscribe(System.out::println); | |
// add concurrency (manually) | |
Observable.create(subscriber -> { | |
new Thread(() -> { | |
try { | |
subscriber.onNext(getData()); | |
subscriber.onCompleted(); | |
} catch (Exception e) { | |
subscriber.onError(e); | |
} | |
}).start(); | |
}).subscribe(System.out::println); | |
// add concurrency (using a Scheduler) | |
Observable.create(subscriber -> { | |
try { | |
subscriber.onNext(getData()); | |
subscriber.onCompleted(); | |
} catch (Exception e) { | |
subscriber.onError(e); | |
} | |
}).subscribeOn(Schedulers.io()) | |
.subscribe(System.out::println); | |
// add operator | |
Observable.create(subscriber -> { | |
try { | |
subscriber.onNext(getData()); | |
subscriber.onCompleted(); | |
} catch (Exception e) { | |
subscriber.onError(e); | |
} | |
}).subscribeOn(Schedulers.io()) | |
.map(data -> data + " --> at " + System.currentTimeMillis()) | |
.subscribe(System.out::println); | |
// add error handling | |
Observable.create(subscriber -> { | |
try { | |
subscriber.onNext(getData()); | |
subscriber.onCompleted(); | |
} catch (Exception e) { | |
subscriber.onError(e); | |
} | |
}).subscribeOn(Schedulers.io()) | |
.map(data -> data + " --> at " + System.currentTimeMillis()) | |
.onErrorResumeNext(e -> Observable.just("Fallback Data")) | |
.subscribe(System.out::println); | |
// infinite | |
Observable.create(subscriber -> { | |
int i = 0; | |
while (!subscriber.isUnsubscribed()) { | |
subscriber.onNext(i++); | |
} | |
}).take(10).subscribe(System.out::println); | |
//Hello World | |
Observable.create(subscriber -> { | |
throw new RuntimeException("failed!"); | |
}).onErrorResumeNext(throwable -> { | |
return Observable.just("fallback value"); | |
}).subscribe(System.out::println); | |
Observable.create(subscriber -> { | |
throw new RuntimeException("failed!"); | |
}).onErrorResumeNext(Observable.just("fallback value")) | |
.subscribe(System.out::println); | |
Observable.create(subscriber -> { | |
throw new RuntimeException("failed!"); | |
}).onErrorReturn(throwable -> { | |
return "fallback value"; | |
}).subscribe(System.out::println); | |
Observable.create(subscriber -> { | |
throw new RuntimeException("failed!"); | |
}).retryWhen(attempts -> { | |
return attempts.zipWith(Observable.range(1, 3), (throwable, i) -> i) | |
.flatMap(i -> { | |
System.out.println("delay retry by " + i + " second(s)"); | |
return Observable.timer(i, TimeUnit.SECONDS); | |
}).concatWith(Observable.error(new RuntimeException("Exceeded 3 retries"))); | |
}) | |
.subscribe(System.out::println, t -> t.printStackTrace()); | |
try { | |
Thread.sleep(20000); | |
} catch (InterruptedException e1) { | |
e1.printStackTrace(); | |
} | |
} | |
private static String getData() { | |
return "Got Data!"; | |
} | |
} |
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