public void handleRegisterMetadata(RegisterMetadataEvent event) {
String metadata = event.getMetadata();
MetadataType metadataType = event.getMetadataType();
String actionClass = event.getActionClass();
RegisterMetadataHolder metadataHolder = new RegisterMetadataHolder(actionClass, metadataType, metadata);
getLogger().debug("Metadata " + metadata + " registered.");
registeredMetadata.add(metadataHolder);
}