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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.flowable;
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.BiFunction;
import io.reactivex.rxjava3.internal.fuseable.*;
import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
import io.reactivex.rxjava3.plugins.RxJavaPlugins;
import java.util.Objects;
/**
* Reduce a Flowable into a single value exposed as Single or signal NoSuchElementException.
*
* @param the value type
*/
public final class FlowableReduceMaybe
extends Maybe
implements HasUpstreamPublisher, FuseToFlowable {
final Flowable source;
final BiFunction reducer;
public FlowableReduceMaybe(Flowable source, BiFunction reducer) {
this.source = source;
this.reducer = reducer;
}
@Override
public Publisher source() {
return source;
}
@Override
public Flowable fuseToFlowable() {
return RxJavaPlugins.onAssembly(new FlowableReduce<>(source, reducer));
}
@Override
protected void subscribeActual(MaybeObserver super T> observer) {
source.subscribe(new ReduceSubscriber<>(observer, reducer));
}
static final class ReduceSubscriber implements FlowableSubscriber, Disposable {
final MaybeObserver super T> downstream;
final BiFunction reducer;
T value;
Subscription upstream;
boolean done;
ReduceSubscriber(MaybeObserver super T> actual, BiFunction reducer) {
this.downstream = actual;
this.reducer = reducer;
}
@Override
public void dispose() {
upstream.cancel();
done = true;
}
@Override
public boolean isDisposed() {
return done;
}
@Override
public void onSubscribe(Subscription s) {
if (SubscriptionHelper.validate(this.upstream, s)) {
this.upstream = s;
downstream.onSubscribe(this);
s.request(Long.MAX_VALUE);
}
}
@Override
public void onNext(T t) {
if (done) {
return;
}
T v = value;
if (v == null) {
value = t;
} else {
try {
value = Objects.requireNonNull(reducer.apply(v, t), "The reducer returned a null value");
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
upstream.cancel();
onError(ex);
}
}
}
@Override
public void onError(Throwable t) {
if (done) {
RxJavaPlugins.onError(t);
return;
}
done = true;
downstream.onError(t);
}
@Override
public void onComplete() {
if (done) {
return;
}
done = true;
T v = value;
if (v != null) {
// value = null;
downstream.onSuccess(v);
} else {
downstream.onComplete();
}
}
}
}
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