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Reactive Extensions for Java
/**
* 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 org.reactivestreams.Subscription;
import io.reactivex.*;
import io.reactivex.annotations.Experimental;
import io.reactivex.disposables.Disposable;
import io.reactivex.exceptions.*;
import io.reactivex.functions.Function;
import io.reactivex.internal.disposables.DisposableHelper;
import io.reactivex.internal.functions.ObjectHelper;
import io.reactivex.internal.fuseable.SimplePlainQueue;
import io.reactivex.internal.queue.SpscArrayQueue;
import io.reactivex.internal.subscriptions.SubscriptionHelper;
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).
* @param the upstream value type
* @since 2.1.11 - experimental
*/
@Experimental
public final class FlowableConcatMapCompletable extends Completable {
final Flowable source;
final Function mapper;
final ErrorMode errorMode;
final int prefetch;
public FlowableConcatMapCompletable(Flowable source,
Function mapper,
ErrorMode errorMode,
int prefetch) {
this.source = source;
this.mapper = mapper;
this.errorMode = errorMode;
this.prefetch = prefetch;
}
@Override
protected void subscribeActual(CompletableObserver s) {
source.subscribe(new ConcatMapCompletableObserver(s, mapper, errorMode, prefetch));
}
static final class ConcatMapCompletableObserver
extends AtomicInteger
implements FlowableSubscriber, 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;
final SimplePlainQueue queue;
Subscription upstream;
volatile boolean active;
volatile boolean done;
volatile boolean disposed;
int consumed;
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);
this.queue = new SpscArrayQueue(prefetch);
}
@Override
public void onSubscribe(Subscription s) {
if (SubscriptionHelper.validate(upstream, s)) {
this.upstream = s;
downstream.onSubscribe(this);
s.request(prefetch);
}
}
@Override
public void onNext(T t) {
if (queue.offer(t)) {
drain();
} else {
upstream.cancel();
onError(new MissingBackpressureException("Queue full?!"));
}
}
@Override
public void onError(Throwable t) {
if (errors.addThrowable(t)) {
if (errorMode == ErrorMode.IMMEDIATE) {
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.cancel();
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) {
upstream.cancel();
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;
}
do {
if (disposed) {
queue.clear();
return;
}
if (!active) {
if (errorMode == ErrorMode.BOUNDARY) {
if (errors.get() != null) {
queue.clear();
Throwable ex = errors.terminate();
downstream.onError(ex);
return;
}
}
boolean d = done;
T v = queue.poll();
boolean empty = v == null;
if (d && empty) {
Throwable ex = errors.terminate();
if (ex != null) {
downstream.onError(ex);
} else {
downstream.onComplete();
}
return;
}
if (!empty) {
int limit = prefetch - (prefetch >> 1);
int c = consumed + 1;
if (c == limit) {
consumed = 0;
upstream.request(limit);
} else {
consumed = c;
}
CompletableSource cs;
try {
cs = ObjectHelper.requireNonNull(mapper.apply(v), "The mapper returned a null CompletableSource");
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
queue.clear();
upstream.cancel();
errors.addThrowable(ex);
ex = errors.terminate();
downstream.onError(ex);
return;
}
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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