Hi,
I have a peculiar use case:
- I have 3 libraries, Core, Sub and OtherSub
- Sub and OtherSub do not know anything about each other, but they know the
existence of Core
- Sub and OtherSub override the same functionality in Core
- In a project, I want to combine Sub and OtherSub.
It does not work, but here is how I wanted to implement this pattern with
Guice:
- in the Core library:
o bind(A.class).to(ACore.class)
o class ACore implements A {
@Override public String a() { "a"; }
}
- in the Sub library:
o bind(A.class).to(ASub.class)
o class ASub implements A {
private final A parent; // instance of ACore or AOtherSub
@Inject ASub(A parent) { this.a = parent; }
@Override public String a() { parent.a() + " overriden"; }
}
- in the OtherSub library:
o bind(A.class).to(AOtherSub.class)
o class AOtherSub implements A {
private final A parent; // instance of ACore or ASub
@Inject ASub(A parent) { this.a = parent; }
@Override public String a() { parent.a() + " !"; }
}
then in the projet using this set of libraries, I would have been able to
do:
- Guice.createInjector(Modules.override(new ModuleCore()).with(new
AOtherSub())).getInstance(A.class).a() // returns "a !"
- Guice.createInjector(Modules.override(Modules.override(new
ModuleCore()).with(new ASub())).with(new
AOtherSub())).getInstance(A.class).a() // returns "a overriden !"
- Guice.createInjector(Modules.override(Modules.override(new
ModuleCore()).with(new AOtherSub())).with(new
ASub())).getInstance(A.class).a() // returns "a ! overriden"
In this implementation, this throws a StackOverflowError because in ASub or
in AOtherSub the instance creation falls in an infinite loop.
Is there a way of doing something like that with Guice ?
Else do you have any insight on how I should implement this use case ?
Cheers,
Aurélien
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