Or not, maybe the assisted inject extension is the wrong way to go
about this. Hopefully someone who understands guice better than I do
can clarify for me.
(I'm using Guice 3.0 btw)
I have an interface, MyInterface and two concrete implementations
ImplementationA and ImplementationB and a factory interface
MyInterfaceFactory for creating implementations of MyInterface. I
also have two annotations, @StyleA and @StyleB which correspond
roughly to the two implementations.
I'd like to have a class created by Guice that has two members like
so:
@Inject @StyleA private MyInterface interfaceTypeA;
@Inject @StyleB private MyInterface interfaceTypeB;
This class is also a factory and contains the logic to determine
whether or not A or B is more suitable for the thing it happens to be
creating.
I was reading about the AssistedInject stuff and I thought I could do
something like:
install(new FactoryModuleBuilder()
.implement(MyInterface.class, StyleA.class,
ImplementationA.class)
.implement(MyInterface.class, StyleB.class,
ImplementationB.class)
.build(MyInterfaceFactory.class));
But at runtime i get guice errors telling me there's no implementation
of MyInterfaceFactory annotated with @StyleA (or @StyleB) bound when
I'm trying to get values injected into the aforementioned fields. It
also tells me that MyInterface is an interface, not a concrete class,
which is true, and that it's unable to create an AssistedInject
factory.
I thought the above use of FactoryModuleBuilder was equivalent to
having done:
bind(MyInterfaceFactory.class).annotatedWith(StyleA.class).toProvider(FactoryProvider.newFactory(MyInterfaceFactory.class,
ImplementationA.class));
bind(MyInterfaceFactory.class).annotatedWith(StyleB.class).toProvider(FactoryProvider.newFactory(MyInterfaceFactory.class,
ImplementationB.class));
Maybe it is, maybe it isn't. I'm going to try that next, but I see
that FactoryProvider is deprecated, and I'd rather not rely on it if
there is a more appropriate way to make this happen.
Am I misunderstanding how these are to be used and/or using them
incorrectly? Is there a better way to accomplish this?
Thanks for any help.
Mike
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