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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.*;

import io.reactivex.*;
import io.reactivex.disposables.Disposable;
import io.reactivex.internal.disposables.DisposableHelper;
import io.reactivex.internal.fuseable.SimplePlainQueue;
import io.reactivex.internal.queue.SpscLinkedArrayQueue;
import io.reactivex.internal.util.AtomicThrowable;
import io.reactivex.plugins.RxJavaPlugins;

/**
 * Merges an Observable and a Single by emitting the items of the Observable and the success
 * value of the Single and waiting until both the Observable and Single terminate normally.
 * 

History: 2.1.10 - experimental * @param the element type of the Observable * @since 2.2 */ public final class ObservableMergeWithSingle extends AbstractObservableWithUpstream { final SingleSource other; public ObservableMergeWithSingle(Observable source, SingleSource other) { super(source); this.other = other; } @Override protected void subscribeActual(Observer observer) { MergeWithObserver parent = new MergeWithObserver(observer); observer.onSubscribe(parent); source.subscribe(parent); other.subscribe(parent.otherObserver); } static final class MergeWithObserver extends AtomicInteger implements Observer, Disposable { private static final long serialVersionUID = -4592979584110982903L; final Observer downstream; final AtomicReference mainDisposable; final OtherObserver otherObserver; final AtomicThrowable error; volatile SimplePlainQueue queue; T singleItem; volatile boolean disposed; volatile boolean mainDone; volatile int otherState; static final int OTHER_STATE_HAS_VALUE = 1; static final int OTHER_STATE_CONSUMED_OR_EMPTY = 2; MergeWithObserver(Observer downstream) { this.downstream = downstream; this.mainDisposable = new AtomicReference(); this.otherObserver = new OtherObserver(this); this.error = new AtomicThrowable(); } @Override public void onSubscribe(Disposable d) { DisposableHelper.setOnce(mainDisposable, d); } @Override public void onNext(T t) { if (compareAndSet(0, 1)) { downstream.onNext(t); if (decrementAndGet() == 0) { return; } } else { SimplePlainQueue q = getOrCreateQueue(); q.offer(t); if (getAndIncrement() != 0) { return; } } drainLoop(); } @Override public void onError(Throwable ex) { if (error.addThrowable(ex)) { DisposableHelper.dispose(mainDisposable); drain(); } else { RxJavaPlugins.onError(ex); } } @Override public void onComplete() { mainDone = true; drain(); } @Override public boolean isDisposed() { return DisposableHelper.isDisposed(mainDisposable.get()); } @Override public void dispose() { disposed = true; DisposableHelper.dispose(mainDisposable); DisposableHelper.dispose(otherObserver); if (getAndIncrement() == 0) { queue = null; singleItem = null; } } void otherSuccess(T value) { if (compareAndSet(0, 1)) { downstream.onNext(value); otherState = OTHER_STATE_CONSUMED_OR_EMPTY; } else { singleItem = value; otherState = OTHER_STATE_HAS_VALUE; if (getAndIncrement() != 0) { return; } } drainLoop(); } void otherError(Throwable ex) { if (error.addThrowable(ex)) { DisposableHelper.dispose(mainDisposable); drain(); } else { RxJavaPlugins.onError(ex); } } SimplePlainQueue getOrCreateQueue() { SimplePlainQueue q = queue; if (q == null) { q = new SpscLinkedArrayQueue(bufferSize()); queue = q; } return q; } void drain() { if (getAndIncrement() == 0) { drainLoop(); } } void drainLoop() { Observer actual = this.downstream; int missed = 1; for (;;) { for (;;) { if (disposed) { singleItem = null; queue = null; return; } if (error.get() != null) { singleItem = null; queue = null; actual.onError(error.terminate()); return; } int os = otherState; if (os == OTHER_STATE_HAS_VALUE) { T v = singleItem; singleItem = null; otherState = OTHER_STATE_CONSUMED_OR_EMPTY; os = OTHER_STATE_CONSUMED_OR_EMPTY; actual.onNext(v); } boolean d = mainDone; SimplePlainQueue q = queue; T v = q != null ? q.poll() : null; boolean empty = v == null; if (d && empty && os == OTHER_STATE_CONSUMED_OR_EMPTY) { queue = null; actual.onComplete(); return; } if (empty) { break; } actual.onNext(v); } missed = addAndGet(-missed); if (missed == 0) { break; } } } static final class OtherObserver extends AtomicReference implements SingleObserver { private static final long serialVersionUID = -2935427570954647017L; final MergeWithObserver parent; OtherObserver(MergeWithObserver parent) { this.parent = parent; } @Override public void onSubscribe(Disposable d) { DisposableHelper.setOnce(this, d); } @Override public void onSuccess(T t) { parent.otherSuccess(t); } @Override public void onError(Throwable e) { parent.otherError(e); } } } }





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