Magento 2 proxy class override

Question

I need to override the class \Magento\Catalog\Model\Product\Link using preference, which is working fine,but the above mentioned class has a proxy class generated automatically \Magento\Catalog\Model\Product\Link\Proxy, which does not include the new methods added in the override. Is there any way we can inject those methods in the proxy class?

EDIT

I have tried to dig in to this and found that we can inject proxy using di.xml. But when i tried to do that, i got an exception that the class Package\Module\Model\Class\Proxy Does not exist. That means the new proxy i am trying to generate is not being generated automatically.

Answer 1

After reading comments in which you've stated:

I have done similar thing and it worked. I have settled with that solution. but i wanted to generate a new proxy class which had new methods included. As the proxy class is used to reduce the load of initializing the class. now as the proxy class is no longer used, the original class will take some more server load. but i think its negligible.

The whole problem you are trying to solve, can be done in more elegant and less upgrade painful way.

If you just added new methods to existing implementation it means you are not changing behavior of original class

1. You should avoid extending public methods of existing class in favor of creating your own class that uses original one as a dependency
2. Then pass your class in the place where you were using original one

This gives you such side benefits:

1. You code easier to test it (single dependency over mocking all core dependencies)
2. It does not violate single responsibility principle
3. It does not affect core in places you don't expect
4. It decouples your business logic from core implementation

Answer 2

I managed to generate the correct Proxy.php file that included my new function by adding the following to my module di.xml

<type name="Magento\Catalog\Model\Product">
    <arguments>
        <argument name="productLink" xsi:type="object">Package\Module\Model\Product\Link\Proxy</argument>
    </arguments>
</type>

Thanks @minlare for the help