Spring Customize Annotation Scanning

A really nice feature in Spring 3.0 is to have custom annotation. Why do you like to have own annotations? Because you could provide some semantic details about the component types. For example when you have a spring bean which is facade, why not use a annotation with the name facade?

Here the spring wiring for beans with the annotation facade:

	<context:component-scan base-package="demo.design">
	<context:include-filter type="annotation"
	expression="com.seitenbau.demo.stereotypes.Facade" />
	</context:component-scan>

view raw customize-context.xml hosted with ❤ by GitHub

The facade annotation:

	@Target({ElementType.TYPE})
	@Retention(RetentionPolicy.RUNTIME)
	public @interface Facade {}

view raw Facade.java hosted with ❤ by GitHub

And here a demo facade spring bean:

	@Facade
	public class AddressFacadeImpl implements AddressFacade
	{
	private AddressService addressService;
	private UserRepository userRepository;
	@Override
	public List<AdresseBean> getAdresses() throws ApplicationException
	{
	return addressService.getAdresses();
	}
	@Override
	public void saveAdresse(AdresseBean adresse) throws ApplicationException
	{
	addressService.saveAdresse(adresse);
	}
	@Override
	public boolean userExists(String username)
	{
	return userRepository.userExists(username);
	}
	@Autowired
	public void setAddressService(AddressService addressService)
	{
	this.addressService = addressService;
	}
	@Autowired
	public void setUserRepository(UserRepository userRepository)
	{
	this.userRepository = userRepository;
	}
	}

view raw AddressFacadeImpl .java hosted with ❤ by GitHub