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package cgeo.geocaching.utils;
import rx.Observable;
import rx.Observable.OnSubscribe;
import rx.Observable.Operator;
import rx.Scheduler;
import rx.Scheduler.Worker;
import rx.Subscriber;
import rx.android.schedulers.AndroidSchedulers;
import rx.functions.Action0;
import rx.functions.Func1;
import rx.observables.BlockingObservable;
import rx.observers.Subscribers;
import rx.schedulers.Schedulers;
import rx.subjects.PublishSubject;
import rx.subscriptions.Subscriptions;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Looper;
import android.os.Process;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
public class RxUtils {
private RxUtils() {
// Utility class, not to be instantiated
}
public final static Scheduler computationScheduler = Schedulers.computation();
public static final Scheduler networkScheduler = Schedulers.from(new ThreadPoolExecutor(10, 10, 5, TimeUnit.SECONDS, new LinkedBlockingQueue<Runnable>()));
private static final HandlerThread looperCallbacksThread =
new HandlerThread("Looper callbacks thread", Process.THREAD_PRIORITY_DEFAULT);
static {
looperCallbacksThread.start();
}
public static final Looper looperCallbacksLooper = looperCallbacksThread.getLooper();
public static final Scheduler looperCallbacksScheduler = AndroidSchedulers.handlerThread(new Handler(looperCallbacksLooper));
public static final Worker looperCallbacksWorker = looperCallbacksScheduler.createWorker();
public static <T> void waitForCompletion(final BlockingObservable<T> observable) {
observable.lastOrDefault(null);
}
public static void waitForCompletion(final Observable<?>... observables) {
waitForCompletion(Observable.merge(observables).toBlocking());
}
/**
* Subscribe function whose subscription and unsubscription take place on a looper thread.
*
* @param <T>
* the type of the observable
*/
public static abstract class LooperCallbacks<T> implements OnSubscribe<T> {
final AtomicInteger counter = new AtomicInteger(0);
final long stopDelay;
final TimeUnit stopDelayUnit;
final protected PublishSubject<T> subject = PublishSubject.create();
public LooperCallbacks(final long stopDelay, final TimeUnit stopDelayUnit) {
this.stopDelay = stopDelay;
this.stopDelayUnit = stopDelayUnit;
}
public LooperCallbacks() {
this(0, TimeUnit.SECONDS);
}
@Override
final public void call(final Subscriber<? super T> subscriber) {
subscriber.add(subject.subscribe(Subscribers.from(subscriber)));
looperCallbacksWorker.schedule(new Action0() {
@Override
public void call() {
if (counter.getAndIncrement() == 0) {
onStart();
}
subscriber.add(Subscriptions.create(new Action0() {
@Override
public void call() {
looperCallbacksWorker.schedule(new Action0() {
@Override
public void call() {
if (counter.decrementAndGet() == 0) {
onStop();
}
}
}, stopDelay, stopDelayUnit);
}
}));
}
});
}
abstract protected void onStart();
abstract protected void onStop();
}
public static <T> Operator<T, T> operatorTakeUntil(final Func1<? super T, Boolean> predicate) {
return new Operator<T, T>() {
@Override
public Subscriber<? super T> call(final Subscriber<? super T> subscriber) {
return new Subscriber<T>(subscriber) {
private boolean done = false;
@Override
public void onCompleted() {
if (!done) {
subscriber.onCompleted();
}
}
@Override
public void onError(final Throwable throwable) {
if (!done) {
subscriber.onError(throwable);
}
}
@Override
public void onNext(final T value) {
subscriber.onNext(value);
boolean shouldEnd = false;
try {
shouldEnd = predicate.call(value);
} catch (final Throwable e) {
done = true;
subscriber.onError(e);
unsubscribe();
}
if (shouldEnd) {
done = true;
subscriber.onCompleted();
unsubscribe();
}
}
};
}
};
}
}
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