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    • hu.akarnokd.rxjava2.internal.subscribers.nbp.NbpBlockingSubscriber Maven / Gradle / Ivy

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    /**
 * 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.subscribers.nbp;

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

import hu.akarnokd.rxjava2.NbpObservable.NbpSubscriber;
import hu.akarnokd.rxjava2.Notification;
import hu.akarnokd.rxjava2.disposables.Disposable;
import hu.akarnokd.rxjava2.internal.util.NotificationLite;

public final class NbpBlockingSubscriber extends AtomicReference implements NbpSubscriber, Disposable {
    /** */
    private static final long serialVersionUID = -4875965440900746268L;

    static final Disposable CANCELLED = new Disposable() {
        @Override
        public void dispose() { }
    };
    
    public static final Object TERMINATED = new Object();

    final Queue queue;
    
    public NbpBlockingSubscriber(Queue queue) {
        this.queue = queue;
    }
    
    @Override
    public void onSubscribe(Disposable s) {
        if (!compareAndSet(null, s)) {
            s.dispose();
            if (get() != CANCELLED) {
                onError(new IllegalStateException("Subscription already set"));
            }
            return;
        }
    }
    
    @Override
    public void onNext(T t) {
        queue.offer(NotificationLite.next(t));
    }
    
    @Override
    public void onError(Throwable t) {
        queue.offer(NotificationLite.error(t));
    }
    
    @Override
    public void onComplete() {
        queue.offer(Notification.complete());
    }
    
    @Override
    public void dispose() {
        Disposable s = get();
        if (s != CANCELLED) {
            s = getAndSet(CANCELLED);
            if (s != CANCELLED && s != null) {
                s.dispose();
                queue.offer(TERMINATED);
            }
        }
    }
    
    public boolean isCancelled() {
        return get() == CANCELLED;
    }
}
    
    
    
    

    




    
    
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