I have an ItemService annotated with Names.named("dataSource1") and
another one annotated with Names.named("dataSource2") exposed from two
different Private Modules like this:
... new PrivateModule()
{
@Override
protected void configure()
{
bind(ItemService.class).annotatedWith(Names.named("dataSource1")).to(ItemServiceImpl1.class);
expose(ItemService.class).annotatedWith(Names.named("dataSource1"));
}
}
... new PrivateModule()
{
@Override
protected void configure()
{
bind(ItemService.class).annotatedWith(Names.named("dataSource2")).to(ItemServiceImpl2.class);
expose(ItemService.class).annotatedWith(Names.named("dataSource2"));
}
}
Each exposed binding is of the same type, but has a different
implementation. I want to be able to place theses in a map and inject
the map so I can do something like this anywhere in my code:
ItemService itemService = itemServices.get("dataSource1")
I started to try and do this with MapBinder but ran into some problems
and later found this at http://code.google.com/p/google-guice/wiki/Multibindings
Limitations
When you use PrivateModules with multibindings, all of the elements
must be bound in the same environment. You cannot create collections
whose elements span private modules. Otherwise injector creation will
fail.
What is the proper way to choose, at runtime, which binding to use
when the bindings are exposed from 2 or more Private Modules ?
Thanks,
Warren
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