private void burn()
{
    synchronized (m_boiler)
    {
        if (m_boiler.getPressure() < 
                   SteamBoiler.PRESSURE_LIMIT - PRESSURE_INCREMENT)
        {
            // Wait to simulate delay
            try
            {
                sleep(100);
            }
            catch (InterruptedException e)
            {
                // Ignore
            }
                
            m_boiler.setPressure( m_boiler.getPressure() + 
                                  PRESSURE_INCREMENT );
        }
    }
}