/**
* 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.internal.disposables.
DisposableHelper;
import io.reactivex.internal.subscriptions.
SubscriptionHelper;
import io.reactivex.plugins.
RxJavaPlugins;
/**
* Delay the subscription to the main Maybe until the other signals an item or completes.
*
* @param <T> the main value type
* @param <U> the other value type
*/
public final class
MaybeDelaySubscriptionOtherPublisher<T, U> extends
AbstractMaybeWithUpstream<T, T> {
final
Publisher<U>
other;
public
MaybeDelaySubscriptionOtherPublisher(
MaybeSource<T>
source,
Publisher<U>
other) {
super(
source);
this.
other =
other;
}
@
Override
protected void
subscribeActual(
MaybeObserver<? super T>
observer) {
other.
subscribe(new
OtherSubscriber<T>(
observer,
source));
}
static final class
OtherSubscriber<T> implements
FlowableSubscriber<
Object>,
Disposable {
final
DelayMaybeObserver<T>
main;
MaybeSource<T>
source;
Subscription upstream;
OtherSubscriber(
MaybeObserver<? super T>
actual,
MaybeSource<T>
source) {
this.
main = new
DelayMaybeObserver<T>(
actual);
this.
source =
source;
}
@
Override
public void
onSubscribe(
Subscription s) {
if (
SubscriptionHelper.
validate(this.
upstream,
s)) {
this.
upstream =
s;
main.
downstream.
onSubscribe(this);
s.
request(
Long.
MAX_VALUE);
}
}
@
Override
public void
onNext(
Object t) {
if (
upstream !=
SubscriptionHelper.
CANCELLED) {
upstream.
cancel();
upstream =
SubscriptionHelper.
CANCELLED;
subscribeNext();
}
}
@
Override
public void
onError(
Throwable t) {
if (
upstream !=
SubscriptionHelper.
CANCELLED) {
upstream =
SubscriptionHelper.
CANCELLED;
main.
downstream.
onError(
t);
} else {
RxJavaPlugins.
onError(
t);
}
}
@
Override
public void
onComplete() {
if (
upstream !=
SubscriptionHelper.
CANCELLED) {
upstream =
SubscriptionHelper.
CANCELLED;
subscribeNext();
}
}
void
subscribeNext() {
MaybeSource<T>
src =
source;
source = null;
src.
subscribe(
main);
}
@
Override
public boolean
isDisposed() {
return
DisposableHelper.
isDisposed(
main.
get());
}
@
Override
public void
dispose() {
upstream.
cancel();
upstream =
SubscriptionHelper.
CANCELLED;
DisposableHelper.
dispose(
main);
}
}
static final class
DelayMaybeObserver<T> extends
AtomicReference<
Disposable>
implements
MaybeObserver<T> {
private static final long
serialVersionUID = 706635022205076709L;
final
MaybeObserver<? super T>
downstream;
DelayMaybeObserver(
MaybeObserver<? super T>
downstream) {
this.
downstream =
downstream;
}
@
Override
public void
onSubscribe(
Disposable d) {
DisposableHelper.
setOnce(this,
d);
}
@
Override
public void
onSuccess(T
value) {
downstream.
onSuccess(
value);
}
@
Override
public void
onError(
Throwable e) {
downstream.
onError(
e);
}
@
Override
public void
onComplete() {
downstream.
onComplete();
}
}
}