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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 Single,
 * signal its success value followed by a completion or signal its error as is.
 * 

History: 2.1.10 - experimental * @param the element type of the main source and output type * @since 2.2 */ public final class FlowableConcatWithSingle extends AbstractFlowableWithUpstream { final SingleSource other; public FlowableConcatWithSingle(Flowable source, SingleSource other) { super(source); this.other = other; } @Override protected void subscribeActual(Subscriber s) { source.subscribe(new ConcatWithSubscriber<>(s, other)); } static final class ConcatWithSubscriber extends SinglePostCompleteSubscriber implements SingleObserver { private static final long serialVersionUID = -7346385463600070225L; final AtomicReference otherDisposable; SingleSource other; ConcatWithSubscriber(Subscriber actual, SingleSource 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() { upstream = SubscriptionHelper.CANCELLED; SingleSource ss = other; other = null; ss.subscribe(this); } @Override public void cancel() { super.cancel(); DisposableHelper.dispose(otherDisposable); } } }





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