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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.internal.operators.observable;

import java.util.concurrent.atomic.AtomicReference;

import io.reactivex.*;
import io.reactivex.disposables.Disposable;
import io.reactivex.internal.disposables.DisposableHelper;

/**
 * Subscribe to a main Observable 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 ObservableConcatWithCompletable extends AbstractObservableWithUpstream { final CompletableSource other; public ObservableConcatWithCompletable(Observable source, CompletableSource other) { super(source); this.other = other; } @Override protected void subscribeActual(Observer observer) { source.subscribe(new ConcatWithObserver(observer, other)); } static final class ConcatWithObserver extends AtomicReference implements Observer, CompletableObserver, Disposable { private static final long serialVersionUID = -1953724749712440952L; final Observer downstream; CompletableSource other; boolean inCompletable; ConcatWithObserver(Observer actual, CompletableSource other) { this.downstream = actual; this.other = other; } @Override public void onSubscribe(Disposable d) { if (DisposableHelper.setOnce(this, d) && !inCompletable) { downstream.onSubscribe(this); } } @Override public void onNext(T t) { downstream.onNext(t); } @Override public void onError(Throwable e) { downstream.onError(e); } @Override public void onComplete() { if (inCompletable) { downstream.onComplete(); } else { inCompletable = true; DisposableHelper.replace(this, null); CompletableSource cs = other; other = null; cs.subscribe(this); } } @Override public void dispose() { DisposableHelper.dispose(this); } @Override public boolean isDisposed() { return DisposableHelper.isDisposed(get()); } } }





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