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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.rxjava3.internal.operators.flowable;
import java.util.Objects;
import java.util.concurrent.atomic.*;
import org.reactivestreams.*;
import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.exceptions.*;
import io.reactivex.rxjava3.functions.Function;
import io.reactivex.rxjava3.internal.subscribers.*;
import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
import io.reactivex.rxjava3.internal.util.*;
import io.reactivex.rxjava3.operators.SimpleQueue;
import io.reactivex.rxjava3.operators.SpscLinkedArrayQueue;
public final class FlowableConcatMapEager extends AbstractFlowableWithUpstream {
final Function> mapper;
final int maxConcurrency;
final int prefetch;
final ErrorMode errorMode;
public FlowableConcatMapEager(Flowable source,
Function> mapper,
int maxConcurrency,
int prefetch,
ErrorMode errorMode) {
super(source);
this.mapper = mapper;
this.maxConcurrency = maxConcurrency;
this.prefetch = prefetch;
this.errorMode = errorMode;
}
@Override
protected void subscribeActual(Subscriber s) {
source.subscribe(new ConcatMapEagerDelayErrorSubscriber<>(
s, mapper, maxConcurrency, prefetch, errorMode));
}
static final class ConcatMapEagerDelayErrorSubscriber
extends AtomicInteger
implements FlowableSubscriber, Subscription, InnerQueuedSubscriberSupport {
private static final long serialVersionUID = -4255299542215038287L;
final Subscriber downstream;
final Function> mapper;
final int maxConcurrency;
final int prefetch;
final ErrorMode errorMode;
final AtomicThrowable errors;
final AtomicLong requested;
final SpscLinkedArrayQueue> subscribers;
Subscription upstream;
volatile boolean cancelled;
volatile boolean done;
volatile InnerQueuedSubscriber current;
ConcatMapEagerDelayErrorSubscriber(Subscriber actual,
Function> mapper, int maxConcurrency, int prefetch,
ErrorMode errorMode) {
this.downstream = actual;
this.mapper = mapper;
this.maxConcurrency = maxConcurrency;
this.prefetch = prefetch;
this.errorMode = errorMode;
this.subscribers = new SpscLinkedArrayQueue<>(Math.min(prefetch, maxConcurrency));
this.errors = new AtomicThrowable();
this.requested = new AtomicLong();
}
@Override
public void onSubscribe(Subscription s) {
if (SubscriptionHelper.validate(this.upstream, s)) {
this.upstream = s;
downstream.onSubscribe(this);
s.request(maxConcurrency == Integer.MAX_VALUE ? Long.MAX_VALUE : maxConcurrency);
}
}
@Override
public void onNext(T t) {
Publisher p;
try {
p = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null Publisher");
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
upstream.cancel();
onError(ex);
return;
}
InnerQueuedSubscriber inner = new InnerQueuedSubscriber<>(this, prefetch);
if (cancelled) {
return;
}
subscribers.offer(inner);
p.subscribe(inner);
if (cancelled) {
inner.cancel();
drainAndCancel();
}
}
@Override
public void onError(Throwable t) {
if (errors.tryAddThrowableOrReport(t)) {
done = true;
drain();
}
}
@Override
public void onComplete() {
done = true;
drain();
}
@Override
public void cancel() {
if (cancelled) {
return;
}
cancelled = true;
upstream.cancel();
errors.tryTerminateAndReport();
drainAndCancel();
}
void drainAndCancel() {
if (getAndIncrement() == 0) {
do {
cancelAll();
} while (decrementAndGet() != 0);
}
}
void cancelAll() {
InnerQueuedSubscriber inner = current;
current = null;
if (inner != null) {
inner.cancel();
}
while ((inner = subscribers.poll()) != null) {
inner.cancel();
}
}
@Override
public void request(long n) {
if (SubscriptionHelper.validate(n)) {
BackpressureHelper.add(requested, n);
drain();
}
}
@Override
public void innerNext(InnerQueuedSubscriber inner, R value) {
if (inner.queue().offer(value)) {
drain();
} else {
inner.cancel();
innerError(inner, MissingBackpressureException.createDefault());
}
}
@Override
public void innerError(InnerQueuedSubscriber inner, Throwable e) {
if (errors.tryAddThrowableOrReport(e)) {
inner.setDone();
if (errorMode != ErrorMode.END) {
upstream.cancel();
}
drain();
}
}
@Override
public void innerComplete(InnerQueuedSubscriber inner) {
inner.setDone();
drain();
}
@Override
public void drain() {
if (getAndIncrement() != 0) {
return;
}
int missed = 1;
InnerQueuedSubscriber inner = current;
Subscriber a = downstream;
ErrorMode em = errorMode;
for (;;) {
long r = requested.get();
long e = 0L;
if (inner == null) {
if (em != ErrorMode.END) {
Throwable ex = errors.get();
if (ex != null) {
cancelAll();
errors.tryTerminateConsumer(downstream);
return;
}
}
boolean outerDone = done;
inner = subscribers.poll();
if (outerDone && inner == null) {
errors.tryTerminateConsumer(downstream);
return;
}
if (inner != null) {
current = inner;
}
}
boolean continueNextSource = false;
if (inner != null) {
SimpleQueue q = inner.queue();
if (q != null) {
while (e != r) {
if (cancelled) {
cancelAll();
return;
}
if (em == ErrorMode.IMMEDIATE) {
Throwable ex = errors.get();
if (ex != null) {
current = null;
inner.cancel();
cancelAll();
errors.tryTerminateConsumer(downstream);
return;
}
}
boolean d = inner.isDone();
R v;
try {
v = q.poll();
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
current = null;
inner.cancel();
cancelAll();
a.onError(ex);
return;
}
boolean empty = v == null;
if (d && empty) {
inner = null;
current = null;
upstream.request(1);
continueNextSource = true;
break;
}
if (empty) {
break;
}
a.onNext(v);
e++;
inner.request(1L);
}
if (e == r) {
if (cancelled) {
cancelAll();
return;
}
if (em == ErrorMode.IMMEDIATE) {
Throwable ex = errors.get();
if (ex != null) {
current = null;
inner.cancel();
cancelAll();
errors.tryTerminateConsumer(downstream);
return;
}
}
boolean d = inner.isDone();
boolean empty = q.isEmpty();
if (d && empty) {
inner = null;
current = null;
upstream.request(1);
continueNextSource = true;
}
}
}
}
if (e != 0L && r != Long.MAX_VALUE) {
requested.addAndGet(-e);
}
if (continueNextSource) {
continue;
}
missed = addAndGet(-missed);
if (missed == 0) {
break;
}
}
}
}
}
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