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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 io.reactivex.rxjava3.functions.Supplier;
import org.reactivestreams.Subscriber;

import java.util.Objects;

public final class FlowableOnBackpressureReduceWith extends AbstractFlowableWithUpstream {

    final BiFunction reducer;
    final Supplier supplier;

    public FlowableOnBackpressureReduceWith(@NonNull Flowable source,
                                            @NonNull Supplier supplier,
                                            @NonNull BiFunction reducer) {
        super(source);
        this.reducer = reducer;
        this.supplier = supplier;
    }

    @Override
    protected void subscribeActual(@NonNull Subscriber s) {
        source.subscribe(new BackpressureReduceWithSubscriber<>(s, supplier, reducer));
    }

    static final class BackpressureReduceWithSubscriber extends AbstractBackpressureThrottlingSubscriber {

        private static final long serialVersionUID = 8255923705960622424L;

        final BiFunction reducer;
        final Supplier supplier;

        BackpressureReduceWithSubscriber(@NonNull Subscriber downstream,
                                         @NonNull Supplier supplier,
                                         @NonNull BiFunction reducer) {
            super(downstream);
            this.reducer = reducer;
            this.supplier = supplier;
        }

        @Override
        public void onNext(T t) {
            R v = current.get();
            if (v != null) {
                v = current.getAndSet(null);
            }
            try {
                if (v == null) {
                    current.lazySet(Objects.requireNonNull(
                            reducer.apply(Objects.requireNonNull(supplier.get(), "The supplier returned a null value"), t),
                            "The reducer returned a null value"
                    ));
                } else {
                    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();
        }
    }
}