/**
* 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<T, U> extends
AbstractObservableWithUpstream<T, T> {
final
Function<? super T, ? extends
ObservableSource<U>>
debounceSelector;
public
ObservableDebounce(
ObservableSource<T>
source,
Function<? super T, ? extends
ObservableSource<U>>
debounceSelector) {
super(
source);
this.
debounceSelector =
debounceSelector;
}
@
Override
public void
subscribeActual(
Observer<? super T>
t) {
source.
subscribe(new
DebounceObserver<T, U>(new
SerializedObserver<T>(
t),
debounceSelector));
}
static final class
DebounceObserver<T, U>
implements
Observer<T>,
Disposable {
final
Observer<? super T>
downstream;
final
Function<? super T, ? extends
ObservableSource<U>>
debounceSelector;
Disposable upstream;
final
AtomicReference<
Disposable>
debouncer = new
AtomicReference<
Disposable>();
volatile long
index;
boolean
done;
DebounceObserver(
Observer<? super T>
actual,
Function<? super T, ? extends
ObservableSource<U>>
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<U>
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<T, U>
dis = new
DebounceInnerObserver<T, U>(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<T, U>
dis = (
DebounceInnerObserver<T, U>)
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<T, U> extends
DisposableObserver<U> {
final
DebounceObserver<T, U>
parent;
final long
index;
final T
value;
boolean
done;
final
AtomicBoolean once = new
AtomicBoolean();
DebounceInnerObserver(
DebounceObserver<T, U>
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();
}
}
}
}