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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 org.reactivestreams.*;

import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.internal.subscriptions.*;

public final class FlowableTakeLastOne extends AbstractFlowableWithUpstream {

    public FlowableTakeLastOne(Flowable source) {
        super(source);
    }

    @Override
    protected void subscribeActual(Subscriber s) {
        source.subscribe(new TakeLastOneSubscriber<>(s));
    }

    static final class TakeLastOneSubscriber extends DeferredScalarSubscription
    implements FlowableSubscriber {

        private static final long serialVersionUID = -5467847744262967226L;

        Subscription upstream;

        TakeLastOneSubscriber(Subscriber downstream) {
            super(downstream);
        }

        @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) {
            value = t;
        }

        @Override
        public void onError(Throwable t) {
            value = null;
            downstream.onError(t);
        }

        @Override
        public void onComplete() {
            T v = value;
            if (v != null) {
                complete(v);
            } else {
                downstream.onComplete();
            }
        }

        @Override
        public void cancel() {
            super.cancel();
            upstream.cancel();
        }
    }
}