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rxjava2-backport developed by David Karnok
There is a newer version: 2.0.0-RC3
/**
 * Copyright 2015 David Karnok and Netflix, Inc.
 * 
 * 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 hu.akarnokd.rxjava2.internal.operators.nbp;

import java.util.concurrent.atomic.AtomicReference;

import hu.akarnokd.rxjava2.*;
import hu.akarnokd.rxjava2.NbpObservable.*;
import hu.akarnokd.rxjava2.disposables.Disposable;
import hu.akarnokd.rxjava2.internal.subscriptions.SubscriptionHelper;

public final class NbpOnSubscribeSubscribeOn implements NbpOnSubscribe {
    final NbpObservable source;
    final Scheduler scheduler;
    
    public NbpOnSubscribeSubscribeOn(NbpObservable source, Scheduler scheduler) {
        this.source = source;
        this.scheduler = scheduler;
    }
    
    @Override
    public void accept(final NbpSubscriber s) {
        /*
         * TODO can't use the returned disposable because to dispose it,
         * one must set a Subscription on s on the current thread, but
         * it is expected that onSubscribe is run on the target scheduler.
         */
        scheduler.scheduleDirect(new Runnable() {
            @Override
            public void run() {
                source.subscribe(s);
            }
        });
    }
    
    static final class SubscribeOnSubscriber extends AtomicReference implements NbpSubscriber, Disposable {
        /** */
        private static final long serialVersionUID = 8094547886072529208L;
        final NbpSubscriber actual;
        final Scheduler.Worker worker;
        
        Disposable s;
        
        public SubscribeOnSubscriber(NbpSubscriber actual, Scheduler.Worker worker) {
            this.actual = actual;
            this.worker = worker;
        }
        
        @Override
        public void onSubscribe(Disposable s) {
            if (SubscriptionHelper.validateDisposable(this.s, s)) {
                return;
            }
            this.s = s;
            lazySet(Thread.currentThread());
            actual.onSubscribe(this);
        }
        
        @Override
        public void onNext(T t) {
            actual.onNext(t);
        }
        
        @Override
        public void onError(Throwable t) {
            try {
                actual.onError(t);
            } finally {
                worker.dispose();
            }
        }
        
        @Override
        public void onComplete() {
            try {
                actual.onComplete();
            } finally {
                worker.dispose();
            }
        }
        
        @Override
        public void dispose() {
            s.dispose();
            worker.dispose();
        }
    }
}