/**
* 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.
AtomicInteger;
import io.reactivex.*;
import io.reactivex.disposables.
Disposable;
import io.reactivex.exceptions.
Exceptions;
import io.reactivex.functions.
BooleanSupplier;
import io.reactivex.internal.disposables.
SequentialDisposable;
public final class
ObservableRepeatUntil<T> extends
AbstractObservableWithUpstream<T, T> {
final
BooleanSupplier until;
public
ObservableRepeatUntil(
Observable<T>
source,
BooleanSupplier until) {
super(
source);
this.
until =
until;
}
@
Override
public void
subscribeActual(
Observer<? super T>
observer) {
SequentialDisposable sd = new
SequentialDisposable();
observer.
onSubscribe(
sd);
RepeatUntilObserver<T>
rs = new
RepeatUntilObserver<T>(
observer,
until,
sd,
source);
rs.
subscribeNext();
}
static final class
RepeatUntilObserver<T> extends
AtomicInteger implements
Observer<T> {
private static final long
serialVersionUID = -7098360935104053232L;
final
Observer<? super T>
downstream;
final
SequentialDisposable upstream;
final
ObservableSource<? extends T>
source;
final
BooleanSupplier stop;
RepeatUntilObserver(
Observer<? super T>
actual,
BooleanSupplier until,
SequentialDisposable sd,
ObservableSource<? extends T>
source) {
this.
downstream =
actual;
this.
upstream =
sd;
this.
source =
source;
this.
stop =
until;
}
@
Override
public void
onSubscribe(
Disposable d) {
upstream.
replace(
d);
}
@
Override
public void
onNext(T
t) {
downstream.
onNext(
t);
}
@
Override
public void
onError(
Throwable t) {
downstream.
onError(
t);
}
@
Override
public void
onComplete() {
boolean
b;
try {
b =
stop.
getAsBoolean();
} catch (
Throwable e) {
Exceptions.
throwIfFatal(
e);
downstream.
onError(
e);
return;
}
if (
b) {
downstream.
onComplete();
} else {
subscribeNext();
}
}
/**
* Subscribes to the source again via trampolining.
*/
void
subscribeNext() {
if (
getAndIncrement() == 0) {
int
missed = 1;
for (;;) {
source.
subscribe(this);
missed =
addAndGet(-
missed);
if (
missed == 0) {
break;
}
}
}
}
}
}