Dead loop when 2 singleton injectee reference each other

[7ujian]

When 2 singleton injectee reference each other. A dead loop is caused during injection.

Here is an example:

class A
{
[Inject] B;
}

class B
{
[Inject] A;
}
class Foo
{
public function Foo()
{
var injector:Injector = new Injector();
injector.map(A).asSingleton();
injector.map(B).asSingleton();
injector.getInstance(A);
}

}

A fixed is adding a "postInstantiate" callback in Injector before "applyInjectionPoints" and assign the instance to _response in the callback.

SingletonProvider.as

    private function createResponse(injector : Injector) : Object
    {
        if (_destroyed)
        {
            throw new InjectorError("Forbidden usage of unmapped singleton provider for type "
                + getQualifiedClassName(_responseType));
        }
        return injector.instantiateUnmapped(_responseType, postInstantiate);
    }

    private function postInstantiate(instance : Object)
    {
        _response = instance;
    }