code: @Override
  	public void shutdown(IAggregator aggregator) {
  		for(IServiceRegistration reg : _serviceRegistrations) {
  			reg.unregister();
  		}
  		_serviceRegistrations.clear();
  
  		// Serialize the cache metadata one last time
  		serializeCache();
  
  		// avoid memory leaks caused by circular references
  		_aggregator = null;
  		_cache.set(null);
  	}
docs: /* (non-Javadoc)
  @see com.ibm.jaggr.service.cache.ICacheManager#shutdown()