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.
/**
 * 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.internal.operators.flowable;

import java.util.concurrent.atomic.*;

import org.reactivestreams.*;

import io.reactivex.*;
import io.reactivex.internal.subscriptions.SubscriptionHelper;
import io.reactivex.internal.util.*;

public final class FlowableTakeUntil<T, U> extends AbstractFlowableWithUpstream<T, T> {
    final Publisher<? extends U> other;
    public FlowableTakeUntil(Flowable<T> source, Publisher<? extends U> other) {
        super(source);
        this.other = other;
    }

    @Override
    protected void subscribeActual(Subscriber<? super T> child) {
        TakeUntilMainSubscriber<T> parent = new TakeUntilMainSubscriber<T>(child);
        child.onSubscribe(parent);

        other.subscribe(parent.other);

        source.subscribe(parent);
    }

    static final class TakeUntilMainSubscriber<T> extends AtomicInteger implements FlowableSubscriber<T>, Subscription {

        private static final long serialVersionUID = -4945480365982832967L;

        final Subscriber<? super T> downstream;

        final AtomicLong requested;

        final AtomicReference<Subscription> upstream;

        final AtomicThrowable error;

        final OtherSubscriber other;

        TakeUntilMainSubscriber(Subscriber<? super T> downstream) {
            this.downstream = downstream;
            this.requested = new AtomicLong();
            this.upstream = new AtomicReference<Subscription>();
            this.other = new OtherSubscriber();
            this.error = new AtomicThrowable();
        }

        @Override
        public void onSubscribe(Subscription s) {
            SubscriptionHelper.deferredSetOnce(this.upstream, requested, s);
        }

        @Override
        public void onNext(T t) {
            HalfSerializer.onNext(downstream, t, this, error);
        }

        @Override
        public void onError(Throwable t) {
            SubscriptionHelper.cancel(other);
            HalfSerializer.onError(downstream, t, this, error);
        }

        @Override
        public void onComplete() {
            SubscriptionHelper.cancel(other);
            HalfSerializer.onComplete(downstream, this, error);
        }

        @Override
        public void request(long n) {
            SubscriptionHelper.deferredRequest(upstream, requested, n);
        }

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

        final class OtherSubscriber extends AtomicReference<Subscription> implements FlowableSubscriber<Object> {

            private static final long serialVersionUID = -3592821756711087922L;

            @Override
            public void onSubscribe(Subscription s) {
                SubscriptionHelper.setOnce(this, s, Long.MAX_VALUE);
            }

            @Override
            public void onNext(Object t) {
                SubscriptionHelper.cancel(this);
                onComplete();
            }

            @Override
            public void onError(Throwable t) {
                SubscriptionHelper.cancel(upstream);
                HalfSerializer.onError(downstream, t, TakeUntilMainSubscriber.this, error);
            }

            @Override
            public void onComplete() {
                SubscriptionHelper.cancel(upstream);
                HalfSerializer.onComplete(downstream, TakeUntilMainSubscriber.this, error);
            }

        }
    }
}