Create a DomainRegistry providing programmatic access to domain elements

[pith]

Currently Domain elements are accessible via injection. It is possible using injection and qualifier to get a certain implementation, but it is static. There is no problem with that, but we also want the possibility to do the same thing programmatically. This will be done by adding a domain registry. This will be particularly useful for policies.

The API can look like this:

@Inject
DomainRegistry domain;

BonusCalculationPolicy myPolicy = domain.policy(BonusCalculationPolicy.class, "qualifier-1").get();

RegistrationService myService = domain.service(RegistrationService.class, "qualifier-1").get();

CustomerFactory myFactory = domain.factory(CustomerFactory.class, "qualifier-1").get();

CustomerRepository myRepository = domain.repository(CustomerRepository.class, aQualifierAnnotation).get();

Ps: Of course the qualifier can also be an annotation.

[pith]

We will also study the possibility to pass constructor parameters. In order to have - not stateful objects but - preinitialized immutable objects.

For instance,

TaxePolicy twentyTaxeRatePolicy = domain.policy(TaxePolicy.class, "FR").get(new TaxeRate(20));

This may require the use of Guice assisted factories, but implementation is not fixed yet.