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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
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/*
* 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 io.reactivex.rxjava3.annotations.NonNull;
import io.reactivex.rxjava3.core.Flowable;
import io.reactivex.rxjava3.exceptions.Exceptions;
import io.reactivex.rxjava3.functions.BiFunction;
import org.reactivestreams.Subscriber;
import java.util.Objects;
public final class FlowableOnBackpressureReduce extends AbstractFlowableWithUpstream {
final BiFunction reducer;
public FlowableOnBackpressureReduce(@NonNull Flowable source, @NonNull BiFunction reducer) {
super(source);
this.reducer = reducer;
}
@Override
protected void subscribeActual(@NonNull Subscriber super T> s) {
source.subscribe(new BackpressureReduceSubscriber<>(s, reducer));
}
static final class BackpressureReduceSubscriber extends AbstractBackpressureThrottlingSubscriber {
private static final long serialVersionUID = 821363947659780367L;
final BiFunction reducer;
BackpressureReduceSubscriber(@NonNull Subscriber super T> downstream, @NonNull BiFunction reducer) {
super(downstream);
this.reducer = reducer;
}
@Override
public void onNext(T t) {
T v = current.get();
if (v != null) {
v = current.getAndSet(null);
}
if (v == null) {
current.lazySet(t);
} else {
try {
current.lazySet(Objects.requireNonNull(reducer.apply(v, t), "The reducer returned a null value"));
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
upstream.cancel();
onError(ex);
return;
}
}
drain();
}
}
}
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