// service implementation.
classFab.addField("_inner", serviceInterface);
classFab.addField("_shutdown", boolean.class);
classFab.addInterface(RegistryShutdownListener.class);
classFab.addMethod(
Modifier.PUBLIC | Modifier.FINAL,
new MethodSignature(void.class, "registryDidShutdown", null, null),
"{ _shutdown = true; }");