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Reactive Extensions for Java
There is a newer version: 3.1.9
/*
 * 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.maybe;

import java.util.concurrent.atomic.AtomicReference;

import org.reactivestreams.*;

import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.disposables.Disposable;
import io.reactivex.rxjava3.exceptions.CompositeException;
import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;

/**
 * Delay the emission of the main signal until the other signals an item or completes.
 * 
 * @param  the main value type
 * @param  the other value type
 */
public final class MaybeDelayOtherPublisher extends AbstractMaybeWithUpstream {

    final Publisher other;

    public MaybeDelayOtherPublisher(MaybeSource source, Publisher other) {
        super(source);
        this.other = other;
    }

    @Override
    protected void subscribeActual(MaybeObserver observer) {
        source.subscribe(new DelayMaybeObserver<>(observer, other));
    }

    static final class DelayMaybeObserver
    implements MaybeObserver, Disposable {
        final OtherSubscriber other;

        final Publisher otherSource;

        Disposable upstream;

        DelayMaybeObserver(MaybeObserver actual, Publisher otherSource) {
            this.other = new OtherSubscriber<>(actual);
            this.otherSource = otherSource;
        }

        @Override
        public void dispose() {
            upstream.dispose();
            upstream = DisposableHelper.DISPOSED;
            SubscriptionHelper.cancel(other);
        }

        @Override
        public boolean isDisposed() {
            return other.get() == SubscriptionHelper.CANCELLED;
        }

        @Override
        public void onSubscribe(Disposable d) {
            if (DisposableHelper.validate(this.upstream, d)) {
                this.upstream = d;

                other.downstream.onSubscribe(this);
            }
        }

        @Override
        public void onSuccess(T value) {
            upstream = DisposableHelper.DISPOSED;
            other.value = value;
            subscribeNext();
        }

        @Override
        public void onError(Throwable e) {
            upstream = DisposableHelper.DISPOSED;
            other.error = e;
            subscribeNext();
        }

        @Override
        public void onComplete() {
            upstream = DisposableHelper.DISPOSED;
            subscribeNext();
        }

        void subscribeNext() {
            otherSource.subscribe(other);
        }
    }

    static final class OtherSubscriber extends
    AtomicReference
    implements FlowableSubscriber