hu.akarnokd.rxjava2.subscribers.completable.CompletableSerializedSubscriber Maven / Gradle / Ivy

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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.subscribers.completable;

import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;

import hu.akarnokd.rxjava2.Completable.CompletableSubscriber;
import hu.akarnokd.rxjava2.disposables.Disposable;

public final class CompletableSerializedSubscriber implements CompletableSubscriber {

    final CompletableSubscriber actual;
    
    volatile int once;
    static final AtomicIntegerFieldUpdater ONCE =
            AtomicIntegerFieldUpdater.newUpdater(CompletableSerializedSubscriber.class, "once");
    
    public CompletableSerializedSubscriber(CompletableSubscriber actual) {
        this.actual = actual;
    }
    
    @Override
    public void onSubscribe(Disposable d) {
        actual.onSubscribe(d);
    }

    @Override
    public void onError(Throwable e) {
        if (ONCE.compareAndSet(this, 0, 1)) {
            actual.onError(e);
        }
    }

    @Override
    public void onComplete() {
        if (ONCE.compareAndSet(this, 0, 1)) {
            actual.onComplete();
        }
    }

}