/**
* 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.maybe;
import java.util.concurrent.atomic.
AtomicReference;
import org.reactivestreams.*;
import io.reactivex.*;
import io.reactivex.disposables.
Disposable;
import io.reactivex.exceptions.
CompositeException;
import io.reactivex.internal.disposables.
DisposableHelper;
import io.reactivex.internal.subscriptions.
SubscriptionHelper;
/**
* Delay the emission of the main signal until the other signals an item or completes.
*
* @param <T> the main value type
* @param <U> the other value type
*/
public final class
MaybeDelayOtherPublisher<T, U> extends
AbstractMaybeWithUpstream<T, T> {
final
Publisher<U>
other;
public
MaybeDelayOtherPublisher(
MaybeSource<T>
source,
Publisher<U>
other) {
super(
source);
this.
other =
other;
}
@
Override
protected void
subscribeActual(
MaybeObserver<? super T>
observer) {
source.
subscribe(new
DelayMaybeObserver<T, U>(
observer,
other));
}
static final class
DelayMaybeObserver<T, U>
implements
MaybeObserver<T>,
Disposable {
final
OtherSubscriber<T>
other;
final
Publisher<U>
otherSource;
Disposable upstream;
DelayMaybeObserver(
MaybeObserver<? super T>
actual,
Publisher<U>
otherSource) {
this.
other = new
OtherSubscriber<T>(
actual);
this.
otherSource =
otherSource;
}
@
Override
public void
dispose() {
upstream.
dispose();
upstream =
DisposableHelper.
DISPOSED;
SubscriptionHelper.
cancel(
other);
}
@
Override
public boolean
isDisposed() {
return
SubscriptionHelper.
isCancelled(
other.
get());
}
@
Override
public void
onSubscribe(
Disposable d) {
if (
DisposableHelper.
validate(this.
upstream,
d)) {
this.
upstream =
d;
other.
downstream.
onSubscribe(this);
}
}
@
Override
public void
onSuccess(T
value) {
upstream =
DisposableHelper.
DISPOSED;
other.
value =
value;
subscribeNext();
}
@
Override
public void
onError(
Throwable e) {
upstream =
DisposableHelper.
DISPOSED;
other.
error =
e;
subscribeNext();
}
@
Override
public void
onComplete() {
upstream =
DisposableHelper.
DISPOSED;
subscribeNext();
}
void
subscribeNext() {
otherSource.
subscribe(
other);
}
}
static final class
OtherSubscriber<T> extends
AtomicReference<
Subscription>
implements
FlowableSubscriber<
Object> {
private static final long
serialVersionUID = -1215060610805418006L;
final
MaybeObserver<? super T>
downstream;
T
value;
Throwable error;
OtherSubscriber(
MaybeObserver<? super T>
downstream) {
this.
downstream =
downstream;
}
@
Override
public void
onSubscribe(
Subscription s) {
SubscriptionHelper.
setOnce(this,
s,
Long.
MAX_VALUE);
}
@
Override
public void
onNext(
Object t) {
Subscription s =
get();
if (
s !=
SubscriptionHelper.
CANCELLED) {
lazySet(
SubscriptionHelper.
CANCELLED);
s.
cancel();
onComplete();
}
}
@
Override
public void
onError(
Throwable t) {
Throwable e =
error;
if (
e == null) {
downstream.
onError(
t);
} else {
downstream.
onError(new
CompositeException(
e,
t));
}
}
@
Override
public void
onComplete() {
Throwable e =
error;
if (
e != null) {
downstream.
onError(
e);
} else {
T
v =
value;
if (
v != null) {
downstream.
onSuccess(
v);
} else {
downstream.
onComplete();
}
}
}
}
}