/**
* 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 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.internal.functions.
ObjectHelper;
import io.reactivex.internal.util.*;
import io.reactivex.subjects.*;
/**
* Repeatedly subscribe to a source if a handler ObservableSource signals an item.
*
* @param <T> the value type
*/
public final class
ObservableRetryWhen<T> extends
AbstractObservableWithUpstream<T, T> {
final
Function<? super
Observable<
Throwable>, ? extends
ObservableSource<?>>
handler;
public
ObservableRetryWhen(
ObservableSource<T>
source,
Function<? super
Observable<
Throwable>, ? extends
ObservableSource<?>>
handler) {
super(
source);
this.
handler =
handler;
}
@
Override
protected void
subscribeActual(
Observer<? super T>
observer) {
Subject<
Throwable>
signaller =
PublishSubject.<
Throwable>
create().
toSerialized();
ObservableSource<?>
other;
try {
other =
ObjectHelper.
requireNonNull(
handler.
apply(
signaller), "The handler returned a null ObservableSource");
} catch (
Throwable ex) {
Exceptions.
throwIfFatal(
ex);
EmptyDisposable.
error(
ex,
observer);
return;
}
RepeatWhenObserver<T>
parent = new
RepeatWhenObserver<T>(
observer,
signaller,
source);
observer.
onSubscribe(
parent);
other.
subscribe(
parent.
inner);
parent.
subscribeNext();
}
static final class
RepeatWhenObserver<T> extends
AtomicInteger implements
Observer<T>,
Disposable {
private static final long
serialVersionUID = 802743776666017014L;
final
Observer<? super T>
downstream;
final
AtomicInteger wip;
final
AtomicThrowable error;
final
Subject<
Throwable>
signaller;
final
InnerRepeatObserver inner;
final
AtomicReference<
Disposable>
upstream;
final
ObservableSource<T>
source;
volatile boolean
active;
RepeatWhenObserver(
Observer<? super T>
actual,
Subject<
Throwable>
signaller,
ObservableSource<T>
source) {
this.
downstream =
actual;
this.
signaller =
signaller;
this.
source =
source;
this.
wip = new
AtomicInteger();
this.
error = new
AtomicThrowable();
this.
inner = new
InnerRepeatObserver();
this.
upstream = new
AtomicReference<
Disposable>();
}
@
Override
public void
onSubscribe(
Disposable d) {
DisposableHelper.
replace(this.
upstream,
d);
}
@
Override
public void
onNext(T
t) {
HalfSerializer.
onNext(
downstream,
t, this,
error);
}
@
Override
public void
onError(
Throwable e) {
active = false;
signaller.
onNext(
e);
}
@
Override
public void
onComplete() {
DisposableHelper.
dispose(
inner);
HalfSerializer.
onComplete(
downstream, this,
error);
}
@
Override
public boolean
isDisposed() {
return
DisposableHelper.
isDisposed(
upstream.
get());
}
@
Override
public void
dispose() {
DisposableHelper.
dispose(
upstream);
DisposableHelper.
dispose(
inner);
}
void
innerNext() {
subscribeNext();
}
void
innerError(
Throwable ex) {
DisposableHelper.
dispose(
upstream);
HalfSerializer.
onError(
downstream,
ex, this,
error);
}
void
innerComplete() {
DisposableHelper.
dispose(
upstream);
HalfSerializer.
onComplete(
downstream, this,
error);
}
void
subscribeNext() {
if (
wip.
getAndIncrement() == 0) {
do {
if (
isDisposed()) {
return;
}
if (!
active) {
active = true;
source.
subscribe(this);
}
} while (
wip.
decrementAndGet() != 0);
}
}
final class
InnerRepeatObserver extends
AtomicReference<
Disposable> implements
Observer<
Object> {
private static final long
serialVersionUID = 3254781284376480842L;
@
Override
public void
onSubscribe(
Disposable d) {
DisposableHelper.
setOnce(this,
d);
}
@
Override
public void
onNext(
Object t) {
innerNext();
}
@
Override
public void
onError(
Throwable e) {
innerError(
e);
}
@
Override
public void
onComplete() {
innerComplete();
}
}
}
}