From: Paul Sandoz <Paul.Sandoz_at_Sun.COM>
Date: Tue, 19 Feb 2008 12:24:12 +0100

Hi,

One of the major pain points i have observed from developers is that
sub-locators return objects and it is necessary to manually pass
contextual information injected on the root resource classes to
resources instantiated and returned by sub-locators.

I have modified things in the trunk so that it is possible for a
sub-locator to return a Class. For example:

     @Path("/parent")
     static public class Parent {
         @GET
         public String getMe() {
             return "parent";
         }

         @Path("child")
         public Class<Child> getChild() {
             return Child.class;
         }
     }

     static public class Child {
         @GET
         public String getMe() {
             return "child";
         }
     }

The standard life-cycle mechanisms (singleton or per-request) should all
work as before and Jersey will defer to a component provider for
instantiating the returned class. So it should be much easier to work
with Spring.


Another fix i am considering is allowing injection of ComponentProvider:

     @Path("/parent")
     static public class Parent {
         @Context ComponentProvider cp;

         @GET
         public String getMe() {
             return "parent";
         }

         @Path("child")
         public Child getChild() {
             Child c = new Child();
             // Spring does not support this :-(
             cp.inject(c);
             return c;
         }
     }

     @Path("/parent")
     static public class Parent {
         @Context ComponentProvider cp;

         @GET
         public String getMe() {
             return "parent";
         }

         @Path("child")
         public Child getChild() {
             return cp.getInstance(c);
         }
     }

which allows the application to have some extra control over the
instance before it is returned. Is this something people would find useful?

Thanks,
Paul.

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    Paul Sandoz
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