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/*
* 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.rxjava3.internal.operators.flowable;
import java.util.concurrent.atomic.AtomicReference;
import org.reactivestreams.Subscriber;
import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.disposables.Disposable;
import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
import io.reactivex.rxjava3.internal.subscribers.SinglePostCompleteSubscriber;
import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
/**
* Subscribe to a main Flowable first, then when it completes normally, subscribe to a Maybe,
* signal its success value followed by a completion or signal its error or completion signal as is.
* History: 2.1.10 - experimental
* @param the element type of the main source and output type
* @since 2.2
*/
public final class FlowableConcatWithMaybe extends AbstractFlowableWithUpstream {
final MaybeSource extends T> other;
public FlowableConcatWithMaybe(Flowable source, MaybeSource extends T> other) {
super(source);
this.other = other;
}
@Override
protected void subscribeActual(Subscriber super T> s) {
source.subscribe(new ConcatWithSubscriber<>(s, other));
}
static final class ConcatWithSubscriber
extends SinglePostCompleteSubscriber
implements MaybeObserver {
private static final long serialVersionUID = -7346385463600070225L;
final AtomicReference otherDisposable;
MaybeSource extends T> other;
boolean inMaybe;
ConcatWithSubscriber(Subscriber super T> actual, MaybeSource extends T> other) {
super(actual);
this.other = other;
this.otherDisposable = new AtomicReference<>();
}
@Override
public void onSubscribe(Disposable d) {
DisposableHelper.setOnce(otherDisposable, d);
}
@Override
public void onNext(T t) {
produced++;
downstream.onNext(t);
}
@Override
public void onError(Throwable t) {
downstream.onError(t);
}
@Override
public void onSuccess(T t) {
complete(t);
}
@Override
public void onComplete() {
if (inMaybe) {
downstream.onComplete();
} else {
inMaybe = true;
upstream = SubscriptionHelper.CANCELLED;
MaybeSource extends T> ms = other;
other = null;
ms.subscribe(this);
}
}
@Override
public void cancel() {
super.cancel();
DisposableHelper.dispose(otherDisposable);
}
}
}