public <T> T getService(Class<T> interfaceClass) {
		List<Object> list = servicesByInterface.get(interfaceClass);
		if (list == null) {
			return null;
		}
		Object object = list.get(0);
		return interfaceClass.cast(object);
	}
Return the first implementation found for the given service class.
@param interfaceClass interface class for the service
@return null if the interfaceClass was not registered
Ghidra/Framework/Project/src/main/java/ghidra/framework/plugintool/mgr/ServiceManager.java