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rxjava3-flowable developed by David Karnok
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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.flowable.internal.operators;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;

import org.reactivestreams.*;

import io.reactivex.common.*;
import io.reactivex.common.exceptions.MissingBackpressureException;
import io.reactivex.common.internal.disposables.*;
import io.reactivex.flowable.Flowable;
import io.reactivex.flowable.internal.subscriptions.SubscriptionHelper;

public final class FlowableTimer extends Flowable {
    final Scheduler scheduler;
    final long delay;
    final TimeUnit unit;
    public FlowableTimer(long delay, TimeUnit unit, Scheduler scheduler) {
        this.delay = delay;
        this.unit = unit;
        this.scheduler = scheduler;
    }

    @Override
    public void subscribeActual(Subscriber s) {
        TimerSubscriber ios = new TimerSubscriber(s);
        s.onSubscribe(ios);

        Disposable d = scheduler.scheduleDirect(ios, delay, unit);

        ios.setResource(d);
    }

    static final class TimerSubscriber extends AtomicReference
    implements Subscription, Runnable {

        private static final long serialVersionUID = -2809475196591179431L;

        final Subscriber actual;

        volatile boolean requested;

        TimerSubscriber(Subscriber actual) {
            this.actual = actual;
        }

        @Override
        public void request(long n) {
            if (SubscriptionHelper.validate(n)) {
                requested = true;
            }
        }

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

        @Override
        public void run() {
            if (get() != DisposableHelper.DISPOSED) {
                if (requested) {
                    actual.onNext(0L);
                    lazySet(DisposedDisposable.INSTANCE);
                    actual.onComplete();
                } else {
                    lazySet(DisposedDisposable.INSTANCE);
                    actual.onError(new MissingBackpressureException("Can't deliver value due to lack of requests"));
                }
            }
        }

        public void setResource(Disposable d) {
            DisposableHelper.trySet(this, d);
        }
    }
}