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HelloWorld.java
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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!";
}
}