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    • hu.akarnokd.rxjava2.internal.subscribers.BlockingSubscriber Maven / Gradle / Ivy

    /**
 * 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;

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

import org.reactivestreams.*;

import hu.akarnokd.rxjava2.internal.util.NotificationLite;

public final class BlockingSubscriber extends AtomicReference implements Subscriber, Subscription {
    /** */
    private static final long serialVersionUID = -4875965440900746268L;

    static final Subscription CANCELLED = new Subscription() {
        @Override
        public void request(long n) {
            
        }
        
        @Override
        public void cancel() {
            
        }
    };
    
    public static final Object TERMINATED = new Object();
    
    final Queue queue;
    
    public BlockingSubscriber(Queue queue) {
        this.queue = queue;
    }
    
    @Override
    public void onSubscribe(Subscription s) {
        if (!compareAndSet(null, s)) {
            s.cancel();
            if (get() != CANCELLED) {
                onError(new IllegalStateException("Subscription already set"));
            }
            return;
        }
        queue.offer(NotificationLite.subscription(this));
    }
    
    @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(NotificationLite.complete());
    }
    
    @Override
    public void request(long n) {
        get().request(n);
    }
    
    @Override
    public void cancel() {
        Subscription s = get();
        if (s != CANCELLED) {
            s = getAndSet(CANCELLED);
            if (s != CANCELLED && s != null) {
                s.cancel();
                queue.offer(TERMINATED);
            }
        }
    }
    
    public boolean isCancelled() {
        return get() == CANCELLED;
    }
}
    
    
    
    

    




    
    
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