On 27 Jul 2011, at 20:25, David Garcia wrote:
> I have some code like this:
>
> Class A { }
>
>
> Class B {
> @Inject A a;
> }
>
> Class C {
>
> @Inject A a;
> }
>
> Class D {
> @Inject A a;
>
> @Inject B b;
>
> @Inject C c;
> }
>
> bind(IfA).toProvider(Provider<A>)
> ...
> bind(IfC).toProvider(Provider<C>)
>
> Is it possible to get the injections to work in such way that i get
> the following??
>
> a1 = new A()
> b1 = new B(a1)
> c1 = new C(a1)
> d1 = new D(a1, b1, c1)
>
>
> a2 = new A()
> b2 = new B(a2)
> c2 = new C(a2)
> d2 = new D(a2, b2, c2)
>
> So A and D instances must be 1 to 1, and A instance must be shared
> between B,C,D instances
sounds a lot like this question:
http://stackoverflow.com/questions/3014140/dependency-injection-scoping-by-region-guice-spring-whatever
general approach is to use a child injector to build instances of D, so A can
be singleton scoped in that child injector
there are alternative solutions, such as creating your own custom scope
(http://code.google.com/p/google-guice/wiki/CustomScopes) which can then hand
out the same instance for a given context (per-thread, etc) but I think the
child injector approach is simpler
> Or maybe any suggestions on how to refactor this in a better way??
>
> Thanks
>
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