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Reactive Extensions for Java
/**
* Copyright (c) 2016-present, RxJava Contributors.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License is
* distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
* the License for the specific language governing permissions and limitations under the License.
*/
package io.reactivex.internal.operators.observable;
import io.reactivex.internal.functions.ObjectHelper;
import java.util.concurrent.atomic.*;
import io.reactivex.*;
import io.reactivex.disposables.Disposable;
import io.reactivex.exceptions.Exceptions;
import io.reactivex.functions.Function;
import io.reactivex.internal.disposables.*;
import io.reactivex.observers.*;
import io.reactivex.plugins.RxJavaPlugins;
public final class ObservableDebounce extends AbstractObservableWithUpstream {
final Function super T, ? extends ObservableSource> debounceSelector;
public ObservableDebounce(ObservableSource source, Function super T, ? extends ObservableSource> debounceSelector) {
super(source);
this.debounceSelector = debounceSelector;
}
@Override
public void subscribeActual(Observer super T> t) {
source.subscribe(new DebounceObserver(new SerializedObserver(t), debounceSelector));
}
static final class DebounceObserver
implements Observer, Disposable {
final Observer super T> downstream;
final Function super T, ? extends ObservableSource> debounceSelector;
Disposable upstream;
final AtomicReference debouncer = new AtomicReference();
volatile long index;
boolean done;
DebounceObserver(Observer super T> actual,
Function super T, ? extends ObservableSource> debounceSelector) {
this.downstream = actual;
this.debounceSelector = debounceSelector;
}
@Override
public void onSubscribe(Disposable d) {
if (DisposableHelper.validate(this.upstream, d)) {
this.upstream = d;
downstream.onSubscribe(this);
}
}
@Override
public void onNext(T t) {
if (done) {
return;
}
long idx = index + 1;
index = idx;
Disposable d = debouncer.get();
if (d != null) {
d.dispose();
}
ObservableSource p;
try {
p = ObjectHelper.requireNonNull(debounceSelector.apply(t), "The ObservableSource supplied is null");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
dispose();
downstream.onError(e);
return;
}
DebounceInnerObserver dis = new DebounceInnerObserver(this, idx, t);
if (debouncer.compareAndSet(d, dis)) {
p.subscribe(dis);
}
}
@Override
public void onError(Throwable t) {
DisposableHelper.dispose(debouncer);
downstream.onError(t);
}
@Override
public void onComplete() {
if (done) {
return;
}
done = true;
Disposable d = debouncer.get();
if (d != DisposableHelper.DISPOSED) {
@SuppressWarnings("unchecked")
DebounceInnerObserver dis = (DebounceInnerObserver)d;
dis.emit();
DisposableHelper.dispose(debouncer);
downstream.onComplete();
}
}
@Override
public void dispose() {
upstream.dispose();
DisposableHelper.dispose(debouncer);
}
@Override
public boolean isDisposed() {
return upstream.isDisposed();
}
void emit(long idx, T value) {
if (idx == index) {
downstream.onNext(value);
}
}
static final class DebounceInnerObserver extends DisposableObserver {
final DebounceObserver parent;
final long index;
final T value;
boolean done;
final AtomicBoolean once = new AtomicBoolean();
DebounceInnerObserver(DebounceObserver parent, long index, T value) {
this.parent = parent;
this.index = index;
this.value = value;
}
@Override
public void onNext(U t) {
if (done) {
return;
}
done = true;
dispose();
emit();
}
void emit() {
if (once.compareAndSet(false, true)) {
parent.emit(index, value);
}
}
@Override
public void onError(Throwable t) {
if (done) {
RxJavaPlugins.onError(t);
return;
}
done = true;
parent.onError(t);
}
@Override
public void onComplete() {
if (done) {
return;
}
done = true;
emit();
}
}
}
}
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