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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.operators.single;
import java.util.Objects;
import java.util.concurrent.atomic.*;
import org.reactivestreams.*;
import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.disposables.Disposable;
import io.reactivex.rxjava3.exceptions.Exceptions;
import io.reactivex.rxjava3.functions.Function;
import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
/**
* A Flowable that emits items based on applying a specified function to the item emitted by the
* source Single, where that function returns a Publisher.
*
*
*
* - Backpressure:
* - The returned {@code Flowable} honors the backpressure of the downstream consumer
* and the {@code Publisher} returned by the mapper function is expected to honor it as well.
* - Scheduler:
* - {@code flatMapPublisher} does not operate by default on a particular {@link Scheduler}.
*
*
* @param the source value type
* @param the result value type
*
* @see ReactiveX operators documentation: FlatMap
* @since 2.1.15
*/
public final class SingleFlatMapPublisher extends Flowable {
final SingleSource source;
final Function super T, ? extends Publisher extends R>> mapper;
public SingleFlatMapPublisher(SingleSource source,
Function super T, ? extends Publisher extends R>> mapper) {
this.source = source;
this.mapper = mapper;
}
@Override
protected void subscribeActual(Subscriber super R> downstream) {
source.subscribe(new SingleFlatMapPublisherObserver<>(downstream, mapper));
}
static final class SingleFlatMapPublisherObserver extends AtomicLong
implements SingleObserver, FlowableSubscriber, Subscription {
private static final long serialVersionUID = 7759721921468635667L;
final Subscriber super T> downstream;
final Function super S, ? extends Publisher extends T>> mapper;
final AtomicReference parent;
Disposable disposable;
SingleFlatMapPublisherObserver(Subscriber super T> actual,
Function super S, ? extends Publisher extends T>> mapper) {
this.downstream = actual;
this.mapper = mapper;
this.parent = new AtomicReference<>();
}
@Override
public void onSubscribe(Disposable d) {
this.disposable = d;
downstream.onSubscribe(this);
}
@Override
public void onSuccess(S value) {
Publisher extends T> f;
try {
f = Objects.requireNonNull(mapper.apply(value), "the mapper returned a null Publisher");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
downstream.onError(e);
return;
}
if (parent.get() != SubscriptionHelper.CANCELLED) {
f.subscribe(this);
}
}
@Override
public void onSubscribe(Subscription s) {
SubscriptionHelper.deferredSetOnce(parent, this, s);
}
@Override
public void onNext(T t) {
downstream.onNext(t);
}
@Override
public void onComplete() {
downstream.onComplete();
}
@Override
public void onError(Throwable e) {
downstream.onError(e);
}
@Override
public void request(long n) {
SubscriptionHelper.deferredRequest(parent, this, n);
}
@Override
public void cancel() {
disposable.dispose();
SubscriptionHelper.cancel(parent);
}
}
}
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