{
componentMap = new Hashtable<String, List<ADSComponent>>();
components = new ArrayList<ADSComponent>();
schemaGenerators = new Hashtable<String, ComponentSchemaGenerator>();
schemaGenerators.put( ADSConstants.ADS_COMPONENT_TYPE_USER, new UserComponentSchemaGenerator() );
listenersMap = new Hashtable<String, List<HubListener>>();
}