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Reactive Extensions for Java

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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.SubscriptionHelper;
import io.reactivex.rxjava3.internal.util.EmptyComponent;

public final class FlowableDetach extends AbstractFlowableWithUpstream {

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

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

    static final class DetachSubscriber implements FlowableSubscriber, Subscription {

        Subscriber downstream;

        Subscription upstream;

        DetachSubscriber(Subscriber downstream) {
            this.downstream = downstream;
        }

        @Override
        public void request(long n) {
            upstream.request(n);
        }

        @Override
        public void cancel() {
            Subscription s = this.upstream;
            this.upstream = EmptyComponent.INSTANCE;
            this.downstream = EmptyComponent.asSubscriber();
            s.cancel();
        }

        @Override
        public void onSubscribe(Subscription s) {
            if (SubscriptionHelper.validate(this.upstream, s)) {
                this.upstream = s;

                downstream.onSubscribe(this);
            }
        }

        @Override
        public void onNext(T t) {
            downstream.onNext(t);
        }

        @Override
        public void onError(Throwable t) {
            Subscriber a = downstream;
            this.upstream = EmptyComponent.INSTANCE;
            this.downstream = EmptyComponent.asSubscriber();
            a.onError(t);
        }

        @Override
        public void onComplete() {
            Subscriber a = downstream;
            this.upstream = EmptyComponent.INSTANCE;
            this.downstream = EmptyComponent.asSubscriber();
            a.onComplete();
        }
    }
}