Bob,
This assumes that by the time you perform your chaining, you've
already created an Injector. What if I want to specify a Provider
inside a module even before I've created any injector for the first
time?
Essentially, my problem is this:
class FooWrapper {
private final Dependancy1 dependancy1;
private final Dependancy2 dependancy2;
private final RuntimeDependancy runtimeDependancy;
@Inject
public FooWrapper(...) {
}
}
So the first two depenancies I know at compile time but the third is
only known at runtime.
Furthermore, the creation of FooWrapper is something that I want to
configure INSIDE Bar:
class Bar {
private final FooWrapper fooWrapper;
@Inject
public Bar(FooWrapper fooWrapper) {
this.fooWrapper = fooWrapper;
}
public Foo createFoo(RuntimeDependancy runtimeDependancy) {
return new FooWrapper(..., ..., runtimeDependancy); // <== heres
the problem
}
}
So, what I'd effectively like to do is have guice inject only part of
the dependencies at start-up and allow me to provide another component
at runtime. Conceivably, something like a provider that takes
arguments:
RuntimeProvider<T> {
<T> get(Object ... args);
}
This would allow me to implement Bar as follows:
class Bar {
private final FooWrapper fooWrapper;
@Inject
public Bar(FooWrapper fooWrapper) {
this.fooWrapper = fooWrapper;
}
public Foo createFoo(RuntimeDependancy runtimeDependancy) {
return runtimeProvider.get(runtimeDependancy);
}
}
This way, I could wire up everything inside my modules and still have
only 1 injector, and not have to do anything after the first injector
is created...
Is there anyway to do this with guice currently?
Nathan
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