^{Originally posted by ShookTea March 11, 2022}
Hi!

Recently I played a little with attributes in PHP 8 and custom rules and created a #[NonDirectMethod] attribute that accepts array of classes that can call such method (for example to enforce using factories for some classes instead of directly calling constructors).

Example usage:

class UserJsonModel
{
    #[NonDirectMethod(allowedIn: [
        UserJsonModelFactory::class,
        UserDetailedJsonModelFactory::class,
    ])]
    public function __construct(User $user)
    {
        // ...
    }
}

Then, I created custom rules for PhpStan that look for New_ and MethodCall nodes and checks if class calling such method is present in allowedIn array of attribute.

It works perfectly well, but problems arise when content of allowedIn is changed, because - as far, as I understand - only UserJsonModel class will have invalidated cache here, which brings problems:

• if I remove UserDetailedJsonModelFactory from allowedIn, but keep calling constructor, I will get false positive result for that factory up until running clear-result-cache
• If I create a new class, call constructor there, run analyze (which will correctly give me negative result) and then add a new class to allowedIn, I will still get a false negative result up until running clear-result-cache

I was wondering if there is some way of creating a custom extension of cache invalidation. In this scenario, such extension will see that cache for some file was invalidated, it will notice that there is a method in that file with #[NonDirectMethod] attribute and will call invalidation for files described in allowedIn attribute.