try {
references = bundleContext.getServiceReferences(FunctionLoader.class.getName(), filter);
if (references != null) {
for (ServiceReference reference : references) {
FunctionLoader loader = (FunctionLoader) bundleContext.getService(reference);
String f = loader.loadFunction(function, family);
if (!Strings.isNullOrEmpty(f)) {
return f;
}
}
}