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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.mixed;

import java.util.concurrent.atomic.*;

import io.reactivex.*;
import io.reactivex.disposables.Disposable;
import io.reactivex.exceptions.Exceptions;
import io.reactivex.functions.Function;
import io.reactivex.internal.disposables.DisposableHelper;
import io.reactivex.internal.functions.ObjectHelper;
import io.reactivex.internal.fuseable.*;
import io.reactivex.internal.queue.SpscLinkedArrayQueue;
import io.reactivex.internal.util.*;
import io.reactivex.plugins.RxJavaPlugins;

/**
 * Maps the upstream items into {@link CompletableSource}s and subscribes to them one after the
 * other completes or terminates (in error-delaying mode).
 * 

History: 2.1.11 - experimental * @param the upstream value type * @since 2.2 */ public final class ObservableConcatMapCompletable extends Completable { final Observable source; final Function mapper; final ErrorMode errorMode; final int prefetch; public ObservableConcatMapCompletable(Observable source, Function mapper, ErrorMode errorMode, int prefetch) { this.source = source; this.mapper = mapper; this.errorMode = errorMode; this.prefetch = prefetch; } @Override protected void subscribeActual(CompletableObserver observer) { if (!ScalarXMapZHelper.tryAsCompletable(source, mapper, observer)) { source.subscribe(new ConcatMapCompletableObserver(observer, mapper, errorMode, prefetch)); } } static final class ConcatMapCompletableObserver extends AtomicInteger implements Observer, Disposable { private static final long serialVersionUID = 3610901111000061034L; final CompletableObserver downstream; final Function mapper; final ErrorMode errorMode; final AtomicThrowable errors; final ConcatMapInnerObserver inner; final int prefetch; SimpleQueue queue; Disposable upstream; volatile boolean active; volatile boolean done; volatile boolean disposed; ConcatMapCompletableObserver(CompletableObserver downstream, Function mapper, ErrorMode errorMode, int prefetch) { this.downstream = downstream; this.mapper = mapper; this.errorMode = errorMode; this.prefetch = prefetch; this.errors = new AtomicThrowable(); this.inner = new ConcatMapInnerObserver(this); } @Override public void onSubscribe(Disposable d) { if (DisposableHelper.validate(upstream, d)) { this.upstream = d; if (d instanceof QueueDisposable) { @SuppressWarnings("unchecked") QueueDisposable qd = (QueueDisposable) d; int m = qd.requestFusion(QueueDisposable.ANY); if (m == QueueDisposable.SYNC) { queue = qd; done = true; downstream.onSubscribe(this); drain(); return; } if (m == QueueDisposable.ASYNC) { queue = qd; downstream.onSubscribe(this); return; } } queue = new SpscLinkedArrayQueue(prefetch); downstream.onSubscribe(this); } } @Override public void onNext(T t) { if (t != null) { queue.offer(t); } drain(); } @Override public void onError(Throwable t) { if (errors.addThrowable(t)) { if (errorMode == ErrorMode.IMMEDIATE) { disposed = true; inner.dispose(); t = errors.terminate(); if (t != ExceptionHelper.TERMINATED) { downstream.onError(t); } if (getAndIncrement() == 0) { queue.clear(); } } else { done = true; drain(); } } else { RxJavaPlugins.onError(t); } } @Override public void onComplete() { done = true; drain(); } @Override public void dispose() { disposed = true; upstream.dispose(); inner.dispose(); if (getAndIncrement() == 0) { queue.clear(); } } @Override public boolean isDisposed() { return disposed; } void innerError(Throwable ex) { if (errors.addThrowable(ex)) { if (errorMode == ErrorMode.IMMEDIATE) { disposed = true; upstream.dispose(); ex = errors.terminate(); if (ex != ExceptionHelper.TERMINATED) { downstream.onError(ex); } if (getAndIncrement() == 0) { queue.clear(); } } else { active = false; drain(); } } else { RxJavaPlugins.onError(ex); } } void innerComplete() { active = false; drain(); } void drain() { if (getAndIncrement() != 0) { return; } AtomicThrowable errors = this.errors; ErrorMode errorMode = this.errorMode; do { if (disposed) { queue.clear(); return; } if (!active) { if (errorMode == ErrorMode.BOUNDARY) { if (errors.get() != null) { disposed = true; queue.clear(); Throwable ex = errors.terminate(); downstream.onError(ex); return; } } boolean d = done; boolean empty = true; CompletableSource cs = null; try { T v = queue.poll(); if (v != null) { cs = ObjectHelper.requireNonNull(mapper.apply(v), "The mapper returned a null CompletableSource"); empty = false; } } catch (Throwable ex) { Exceptions.throwIfFatal(ex); disposed = true; queue.clear(); upstream.dispose(); errors.addThrowable(ex); ex = errors.terminate(); downstream.onError(ex); return; } if (d && empty) { disposed = true; Throwable ex = errors.terminate(); if (ex != null) { downstream.onError(ex); } else { downstream.onComplete(); } return; } if (!empty) { active = true; cs.subscribe(inner); } } } while (decrementAndGet() != 0); } static final class ConcatMapInnerObserver extends AtomicReference implements CompletableObserver { private static final long serialVersionUID = 5638352172918776687L; final ConcatMapCompletableObserver parent; ConcatMapInnerObserver(ConcatMapCompletableObserver parent) { this.parent = parent; } @Override public void onSubscribe(Disposable d) { DisposableHelper.replace(this, d); } @Override public void onError(Throwable e) { parent.innerError(e); } @Override public void onComplete() { parent.innerComplete(); } void dispose() { DisposableHelper.dispose(this); } } } }





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