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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.observable.internal.operators;

import java.util.concurrent.atomic.AtomicReference;

import io.reactivex.common.Disposable;
import io.reactivex.common.internal.disposables.DisposableHelper;
import io.reactivex.observable.*;
import io.reactivex.observable.internal.observers.ResumeSingleObserver;

public final class SingleDelayWithSingle extends Single {

    final SingleSource source;

    final SingleSource other;

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

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

    static final class OtherObserver
    extends AtomicReference
    implements SingleObserver, Disposable {


        private static final long serialVersionUID = -8565274649390031272L;

        final SingleObserver actual;

        final SingleSource source;

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

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

                actual.onSubscribe(this);
            }
        }

        @Override
        public void onSuccess(U value) {
            source.subscribe(new ResumeSingleObserver(this, actual));
        }

        @Override
        public void onError(Throwable e) {
            actual.onError(e);
        }

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

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