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Easy Redis Java client and Real-Time Data Platform. Valkey compatible. Sync/Async/RxJava3/Reactive API. Client side caching. Over 50 Redis based Java objects and services: JCache API, Apache Tomcat, Hibernate, Spring, Set, Multimap, SortedSet, Map, List, Queue, Deque, Semaphore, Lock, AtomicLong, Map Reduce, Bloom filter, Scheduler, RPC
/*
* 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.jdk8;
import java.util.Objects;
import java.util.concurrent.atomic.*;
import java.util.function.*;
import java.util.stream.Collector;
import org.reactivestreams.*;
import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.exceptions.Exceptions;
import io.reactivex.rxjava3.internal.subscriptions.*;
import io.reactivex.rxjava3.internal.util.AtomicThrowable;
import io.reactivex.rxjava3.parallel.ParallelFlowable;
import io.reactivex.rxjava3.plugins.RxJavaPlugins;
/**
* Reduces all 'rails' into a single via a Java 8 {@link Collector} callback set.
*
* @param the value type
* @param the accumulator type
* @param the result type
* @since 3.0.0
*/
public final class ParallelCollector extends Flowable {
final ParallelFlowable source;
final Collector collector;
public ParallelCollector(ParallelFlowable source, Collector collector) {
this.source = source;
this.collector = collector;
}
@Override
protected void subscribeActual(Subscriber s) {
ParallelCollectorSubscriber parent;
try {
parent = new ParallelCollectorSubscriber<>(s, source.parallelism(), collector);
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
EmptySubscription.error(ex, s);
return;
}
s.onSubscribe(parent);
source.subscribe(parent.subscribers);
}
static final class ParallelCollectorSubscriber extends DeferredScalarSubscription {
private static final long serialVersionUID = -5370107872170712765L;
final ParallelCollectorInnerSubscriber[] subscribers;
final AtomicReference> current = new AtomicReference<>();
final AtomicInteger remaining = new AtomicInteger();
final AtomicThrowable error = new AtomicThrowable();
final Function finisher;
ParallelCollectorSubscriber(Subscriber subscriber, int n, Collector collector) {
super(subscriber);
this.finisher = collector.finisher();
@SuppressWarnings("unchecked")
ParallelCollectorInnerSubscriber[] a = new ParallelCollectorInnerSubscriber[n];
for (int i = 0; i < n; i++) {
a[i] = new ParallelCollectorInnerSubscriber<>(this, collector.supplier().get(), collector.accumulator(), collector.combiner());
}
this.subscribers = a;
remaining.lazySet(n);
}
SlotPair addValue(A value) {
for (;;) {
SlotPair curr = current.get();
if (curr == null) {
curr = new SlotPair<>();
if (!current.compareAndSet(null, curr)) {
continue;
}
}
int c = curr.tryAcquireSlot();
if (c < 0) {
current.compareAndSet(curr, null);
continue;
}
if (c == 0) {
curr.first = value;
} else {
curr.second = value;
}
if (curr.releaseSlot()) {
current.compareAndSet(curr, null);
return curr;
}
return null;
}
}
@Override
public void cancel() {
for (ParallelCollectorInnerSubscriber inner : subscribers) {
inner.cancel();
}
}
void innerError(Throwable ex) {
if (error.compareAndSet(null, ex)) {
cancel();
downstream.onError(ex);
} else {
if (ex != error.get()) {
RxJavaPlugins.onError(ex);
}
}
}
void innerComplete(A value, BinaryOperator combiner) {
for (;;) {
SlotPair sp = addValue(value);
if (sp != null) {
try {
value = combiner.apply(sp.first, sp.second);
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
innerError(ex);
return;
}
} else {
break;
}
}
if (remaining.decrementAndGet() == 0) {
SlotPair sp = current.get();
current.lazySet(null);
R result;
try {
result = Objects.requireNonNull(finisher.apply(sp.first), "The finisher returned a null value");
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
innerError(ex);
return;
}
complete(result);
}
}
}
static final class ParallelCollectorInnerSubscriber
extends AtomicReference
implements FlowableSubscriber {
private static final long serialVersionUID = -7954444275102466525L;
final ParallelCollectorSubscriber parent;
final BiConsumer accumulator;
final BinaryOperator combiner;
A container;
boolean done;
ParallelCollectorInnerSubscriber(ParallelCollectorSubscriber parent, A container, BiConsumer accumulator, BinaryOperator combiner) {
this.parent = parent;
this.accumulator = accumulator;
this.combiner = combiner;
this.container = container;
}
@Override
public void onSubscribe(Subscription s) {
SubscriptionHelper.setOnce(this, s, Long.MAX_VALUE);
}
@Override
public void onNext(T t) {
if (!done) {
try {
accumulator.accept(container, t);
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
get().cancel();
onError(ex);
}
}
}
@Override
public void onError(Throwable t) {
if (done) {
RxJavaPlugins.onError(t);
return;
}
container = null;
done = true;
parent.innerError(t);
}
@Override
public void onComplete() {
if (!done) {
A v = container;
container = null;
done = true;
parent.innerComplete(v, combiner);
}
}
void cancel() {
SubscriptionHelper.cancel(this);
}
}
static final class SlotPair extends AtomicInteger {
private static final long serialVersionUID = 473971317683868662L;
T first;
T second;
final AtomicInteger releaseIndex = new AtomicInteger();
int tryAcquireSlot() {
for (;;) {
int acquired = get();
if (acquired >= 2) {
return -1;
}
if (compareAndSet(acquired, acquired + 1)) {
return acquired;
}
}
}
boolean releaseSlot() {
return releaseIndex.incrementAndGet() == 2;
}
}
}
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