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package cgeo.geocaching.utils;
import rx.Observable;
import rx.Scheduler;
import rx.Scheduler.Worker;
import rx.Subscription;
import rx.android.schedulers.AndroidSchedulers;
import rx.functions.Action0;
import rx.functions.Action1;
import rx.observables.BlockingObservable;
import rx.observables.ConnectableObservable;
import rx.schedulers.Schedulers;
import rx.subscriptions.CompositeSubscription;
import rx.subscriptions.Subscriptions;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
public class RxUtils {
// Utility class, not to be instanciated
private RxUtils() {}
public final static Scheduler computationScheduler = Schedulers.computation();
public static final Scheduler networkScheduler = Schedulers.from(new ThreadPoolExecutor(10, 10, 5, TimeUnit.SECONDS, new LinkedBlockingQueue<Runnable>()));
public static <T> void waitForCompletion(final BlockingObservable<T> observable) {
observable.lastOrDefault(null);
}
public static void waitForCompletion(final Observable<?>... observables) {
waitForCompletion(Observable.merge(observables).toBlocking());
}
/**
* ConnectableObservable whose subscription and unsubscription take place on a looper thread.
*
* @param <T> the type of the observable
*/
public static abstract class ConnectableLooperCallbacks<T> extends ConnectableObservable<T> {
private static final StartableHandlerThread looperCallbacksThread =
new StartableHandlerThread("Looper callbacks thread", android.os.Process.THREAD_PRIORITY_BACKGROUND);
static {
looperCallbacksThread.start();
}
private static final Worker looperCallbacksWorker = AndroidSchedulers.handlerThread(looperCallbacksThread.getHandler()).createWorker();
final AtomicInteger counter = new AtomicInteger(0);
final long stopDelay;
final TimeUnit stopDelayUnit;
public ConnectableLooperCallbacks(final OnSubscribe<T> onSubscribe, final long stopDelay, final TimeUnit stopDelayUnit) {
super(onSubscribe);
this.stopDelay = stopDelay;
this.stopDelayUnit = stopDelayUnit;
}
public ConnectableLooperCallbacks(final OnSubscribe<T> onSubscribe) {
this(onSubscribe, 0, TimeUnit.SECONDS);
}
@Override
final public void connect(final Action1<? super Subscription> action1) {
final CompositeSubscription subscription = new CompositeSubscription();
looperCallbacksWorker.schedule(new Action0() {
@Override
public void call() {
if (counter.getAndIncrement() == 0) {
onStart();
}
subscription.add(Subscriptions.create(new Action0() {
@Override
public void call() {
looperCallbacksWorker.schedule(new Action0() {
@Override
public void call() {
if (counter.decrementAndGet() == 0) {
onStop();
}
}
}, stopDelay, stopDelayUnit);
}
}));
}
});
action1.call(subscription);
}
abstract protected void onStart();
abstract protected void onStop();
}
}
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