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The Byteman agent jar contains the implementation of the Byteman java agent, including the bytecode transformer, rule parser, type checker and execution engine and the agent listener.

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/*
* JBoss, Home of Professional Open Source
* Copyright 2008-10 Red Hat and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*
* @authors Andrew Dinn
*/
package org.jboss.byteman.synchronization;

/**
 * class provided to support rule builtins getCounter, decrementCounter and addCounter
 */
public class CountDown
{
    public CountDown(int count)
    {
        this.count = (count < 1 ? 1 : count);
    }

    public synchronized boolean decrement()
    {
        if (count > 0) {
            count--;
            return false;
        }

        return true;
    }

    private int count;
}