public void message(final Session ssn, final MessageTransfer xfr)
{
ExchangeRegistry exchangeRegistry = getVirtualHost().getExchangeRegistry();
Exchange exchange = exchangeRegistry.getExchange(_destination);
// TODO - deal with exchange not existing
DeliveryProperties delvProps = null;
if(xfr.getHeader() != null && (delvProps = xfr.getHeader().get(DeliveryProperties.class)) != null && delvProps.hasTtl() && !delvProps.hasExpiration())