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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.*;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Stream;
import io.reactivex.rxjava3.annotations.NonNull;
import io.reactivex.rxjava3.core.Observable;
import io.reactivex.rxjava3.core.Observer;
import io.reactivex.rxjava3.disposables.Disposable;
import io.reactivex.rxjava3.exceptions.Exceptions;
import io.reactivex.rxjava3.functions.*;
import io.reactivex.rxjava3.internal.disposables.*;
import io.reactivex.rxjava3.plugins.RxJavaPlugins;
/**
* Maps the upstream values onto {@link Stream}s and emits their items in order to the downstream.
*
* @param the upstream element type
* @param the inner {@code Stream} and result element type
* @since 3.0.0
*/
public final class ObservableFlatMapStream extends Observable {
final Observable source;
final Function super T, ? extends Stream extends R>> mapper;
public ObservableFlatMapStream(Observable source, Function super T, ? extends Stream extends R>> mapper) {
this.source = source;
this.mapper = mapper;
}
@Override
protected void subscribeActual(Observer super R> observer) {
if (source instanceof Supplier) {
Stream extends R> stream = null;
try {
@SuppressWarnings("unchecked")
T t = ((Supplier)source).get();
if (t != null) {
stream = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null Stream");
}
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
EmptyDisposable.error(ex, observer);
return;
}
if (stream != null) {
ObservableFromStream.subscribeStream(observer, stream);
} else {
EmptyDisposable.complete(observer);
}
} else {
source.subscribe(new FlatMapStreamObserver<>(observer, mapper));
}
}
static final class FlatMapStreamObserver extends AtomicInteger
implements Observer, Disposable {
private static final long serialVersionUID = -5127032662980523968L;
final Observer super R> downstream;
final Function super T, ? extends Stream extends R>> mapper;
Disposable upstream;
volatile boolean disposed;
boolean done;
FlatMapStreamObserver(Observer super R> downstream, Function super T, ? extends Stream extends R>> mapper) {
this.downstream = downstream;
this.mapper = mapper;
}
@Override
public void onSubscribe(@NonNull Disposable d) {
if (DisposableHelper.validate(this.upstream, d)) {
this.upstream = d;
downstream.onSubscribe(this);
}
}
@Override
public void onNext(@NonNull T t) {
if (done) {
return;
}
try {
try (Stream extends R> stream = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null Stream")) {
Iterator extends R> it = stream.iterator();
while (it.hasNext()) {
if (disposed) {
done = true;
break;
}
R value = Objects.requireNonNull(it.next(), "The Stream's Iterator.next returned a null value");
if (disposed) {
done = true;
break;
}
downstream.onNext(value);
if (disposed) {
done = true;
break;
}
}
}
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
upstream.dispose();
onError(ex);
}
}
@Override
public void onError(@NonNull Throwable e) {
if (done) {
RxJavaPlugins.onError(e);
} else {
done = true;
downstream.onError(e);
}
}
@Override
public void onComplete() {
if (!done) {
done = true;
downstream.onComplete();
}
}
@Override
public void dispose() {
disposed = true;
upstream.dispose();
}
@Override
public boolean isDisposed() {
return disposed;
}
}
}
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