/**
* groupBy the mod of 5, thus the values into those who can starting at 0-4 respectively into
* groups
*
* <p>Must reason about the logic that is going on here.
*/
public static void groupedObserv() {
Observable.fromIterable(ints)
// Function<Input, Output>;
.groupBy(
(Function<Integer, Integer>)
new Function<Integer, Integer>() {
@Override
public Integer apply(Integer integer) throws Exception {
return integer % 5;
}
})
.flatMap(
new Function<GroupedObservable<Integer, Integer>, ObservableSource<?>>() {
@Override
public ObservableSource<?> apply( // each group is now a stream
GroupedObservable<Integer, Integer> integerIntegerGroupedObservable)
throws Exception {
return integerIntegerGroupedObservable.toList().toObservable();
}
})
.toList() // to list is important as it is the Single<List<Object>>
.subscribe(
new Consumer<List<Object>>() {
@Override
public void accept(List<Object> objects) throws Exception {
for (Object o : objects) {
System.out.println(o.toString());
}
}
});
}
@OnClick(R.id.btn_start_operation)
public void startOperation() {
_logs.clear();
_log("Button Clicked");
Observable.fromIterable(
Arrays.asList("a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l")) //
.flatMap(
s1 -> {
_log(s1 + "start");
if (s1.equalsIgnoreCase("b") && _attempt < 5) {
_attempt++;
return Observable.error(
new Throwable("b can't be processed (" + (_attempt - 1) + ")"));
}
if (s1.equalsIgnoreCase("c") || s1.equalsIgnoreCase("f")) {
return Observable.just(s1);
} else {
return Observable.timer(2, TimeUnit.SECONDS).map(l -> s1);
}
})
.retryWhen(source -> source.delay(8, TimeUnit.SECONDS))
.doOnNext(s -> _log(s + "stop"))
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe();
}