resolve https://issues.apache.org/activemq/browse/AMQ-2779 - add selectorAware option to a virtual topic such that only message matching some exisitng subscription selector are propagated to a subscription queue, this allows dynamic selector usage withough the build up of unmatched messages on a destination
activemq/trunk/activemq-core/src/main/java/org/apache/activemq/broker/region/virtual/SelectorAwareVirtualTopicInterceptor.java