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Reactive Extensions for Java
There is a newer version: 2.2.21
/**
 * 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.single;

import java.util.concurrent.atomic.AtomicReference;

import io.reactivex.*;
import io.reactivex.disposables.Disposable;
import io.reactivex.internal.disposables.DisposableHelper;
import io.reactivex.internal.observers.ResumeSingleObserver;
import io.reactivex.plugins.RxJavaPlugins;

public final class SingleDelayWithObservable extends Single {

    final SingleSource source;

    final ObservableSource other;

    public SingleDelayWithObservable(SingleSource source, ObservableSource other) {
        this.source = source;
        this.other = other;
    }

    @Override
    protected void subscribeActual(SingleObserver observer) {
        other.subscribe(new OtherSubscriber(observer, source));
    }

    static final class OtherSubscriber
    extends AtomicReference
    implements Observer, Disposable {

        private static final long serialVersionUID = -8565274649390031272L;

        final SingleObserver downstream;

        final SingleSource source;

        boolean done;

        OtherSubscriber(SingleObserver actual, SingleSource source) {
            this.downstream = actual;
            this.source = source;
        }

        @Override
        public void onSubscribe(Disposable d) {
            if (DisposableHelper.set(this, d)) {

                downstream.onSubscribe(this);
            }
        }

        @Override
        public void onNext(U value) {
            get().dispose();
            onComplete();
        }

        @Override
        public void onError(Throwable e) {
            if (done) {
                RxJavaPlugins.onError(e);
                return;
            }
            done = true;
            downstream.onError(e);
        }

        @Override
        public void onComplete() {
            if (done) {
                return;
            }
            done = true;
            source.subscribe(new ResumeSingleObserver(this, downstream));
        }

        @Override
        public void dispose() {
            DisposableHelper.dispose(this);
        }

        @Override
        public boolean isDisposed() {
            return DisposableHelper.isDisposed(get());
        }
    }
}