[xwiki-devs] [Proposal] Migration to JSR330 for our component model

Hi devs, Since the JSR330 is now accepted as final and thus as a standard, I'd like to propose that we modify our component annotations to use it. Rationale ======== The advantages of using it are: * Be standard, ie: ** Our components will be able to be re-used by injectors other than ours (Guice for example) ** Since IDEs will support JSR330 they'll be able to offer features for our code (auto complete, graph, etc), for ex http://blogs.jetbrains.com/idea/tag/dependency-injection/ Proposed Changes =============== Note: JSR330 doesn't specify how components should be bound, hence the need to keep xwiki-specific metadata for the bindings. * @Component and @ComponentRole stay unchanged * Deprecate @Requirement, replaced by @Inject * Use @Named or application-specific annotations (based on @Qualifier) instead of hints specified in the @Requirement annotation * Add new @Role(Class) to specify a dependency role in the case of collections (since generics are not available using reflection in Java) * Deprecate @InstantiationStrategy, replaced by @Singleton. We don't need to introduce any other scope annotations for now. * Note that the default scope in the JSR330 spec is "per lookup". Since our default is singleton, we'll need to add @Singleton annotations everywhere we used to not have anything. Example before: @Component("html") public class HTMLMacro extends AbstractMacro<HTMLMacroParameters> { ... @Requirement private HTMLCleaner htmlCleaner; ... @Requirement("xhtmlmacro/1.0") private PrintRendererFactory xhtmlRendererFactory; ... Same example after the change: @Component("html") public class HTMLMacro extends AbstractMacro<HTMLMacroParameters> { ... @Inject private HTMLCleaner htmlCleaner; ... @Inject @Named("xhtmlmacro/1.0") private PrintRendererFactory xhtmlRendererFactory; ... WDYT? Thanks -Vincent