_lifetimePolicy = MapValueConverter.getEnumAttribute(LifetimePolicy.class,
org.apache.qpid.server.model.Exchange.LIFETIME_POLICY,
attributes,
LifetimePolicy.PERMANENT);
_autoDelete = _lifetimePolicy != LifetimePolicy.PERMANENT;
_logSubject = new ExchangeLogSubject(this, this.getVirtualHost());
// check ACL
_virtualHost.getSecurityManager().authoriseCreateExchange(this);