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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS 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 org.jgroups.annotations.Experimental;

import java.util.function.Consumer;

/**
 * Ref-counted implementation; can be used by message implementations.

 * Note that this class is experimental and may get removed without notice. The point of it is to get experience with
 * ref counted messages and see if they're needed or not.

 * See https://issues.redhat.com/browse/JGRP-2417 for details
 * @author Bela Ban
 * @since  5.1.0
 */
@Experimental
public class RefcountImpl {
    protected byte        refcount;
    protected Consumer release_code;

    public RefcountImpl() {
    }

    public RefcountImpl(Consumer c) {
        this.release_code=c;
    }

    public synchronized byte getRefcount() {
        return refcount;
    }

    public synchronized RefcountImpl incr() {
        refcount++;
        return this;
    }

    public synchronized RefcountImpl decr(T t) {
        byte tmp=--refcount;
        if(tmp == 0)
            release(t);
        else if(tmp < 0)
            refcount=0;
        return this;
    }

    public RefcountImpl onRelease(Consumer rc) {
        release_code=rc;
        return this;
    }

    @Override
    public String toString() {
        return String.format("%s (refcnt=%d)", super.toString(), refcount);
    }


    protected void release(T t) {
        if(release_code != null)
            release_code.accept(t);
    }
}