org.jgroups.util.PaddedAtomicLong Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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package org.jgroups.util;

import java.util.concurrent.atomic.AtomicLong;

/**
 * Copied from http://mechanical-sympathy.blogspot.ch/2011/08/false-sharing-java-7.html. Switch to @Contended once
 * it is available.
 * @author Bela Ban
 * @since  4.0
 */
@SuppressWarnings("serial")
public class PaddedAtomicLong extends AtomicLong {
    public volatile long p1=1,p2=2,p3=3,p4=4,p5=5,p6=6,p7=7;

    public long sum() { // prevents optimizing away the fields above
        return p1+p2+p3+p4+p5+p6+p7;
    }

    public PaddedAtomicLong(long initialValue) {
        super(initialValue);
    }
}