I dont know if this makes sense, but there seems to be a problem when
you need multiple instances of
the same object, created using the same modules.
For example:
you have the mainmodule and the sub module will create the same kind
of object, only with a slight difference.
They will bind to different places in the application though.
The object sto inject into :
class MyApp {
@Inject @Named("Bob")
Person person1;
@Inject @Named("Bill")
Person person2;
}
class MyPerson {
String name;
@Inject Phone phone;
}
The main module :
//install other modules
binder.install(module1);
binder.install(module2);
//install person modules
binder.install(new PersonModule("Bob"))
binder.install(new PersonModule("Bill"));
The person module:
//..configure person
class PersoModule {
String name;
public PersonModule(String name) {
this.name = name;
}
configure(Binder binder) {
//configure other stuff
binder.bind(Phone.class).toInstance(new CellPhone());
//bind person
binder.bind(Person.class).annotatedWith(Names.named(name).toInstance(new
EmployeePerson(name);
}
}
The binding will fail because
binder.bind(Phone.class).toInstance(new CellPhone());
Will be called twice. I know that it could be bind once in the main
module, but this is a simple example, imagine much more complicate
configuration in the PersonModule.
Problem is that what goes on after binder.install() always touches the
calling module, even though in this case, the Phone binding is only
relevant for the PersonModule and the objects created here.
I'd like a command like bindLocally :
binder.bindLocally(Phone.class).toInstance(new CellPhone());
That binding will only touch objects created in this module, not any
calling modules or modules called.
I tried to look at scopes but it doesnt seem to have anything to do
with this.
Thanks.
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