Doctrine Proxy by Interface example

<?php

interface MyEntityInterface
{
    function foo(string $a): int;
    function bar(int $b): string;
}

final class MyEntity implements MyEntityInterface
{
    function foo(string $a): int
    {
        # ...
    }

    function bar(int $b): string
    {
        # ...
    }
}

final class MyEntityProxy implements MyEntityInterface
{
    public function __construct(MyEntity $innerEntity, DoctrineHydratorThingyAndStuff $hydrator)
    {
        $this->innerEntity = $innerEntity;
        $this->hydrator = $hydrator;
    }

    function foo(string $a): int
    {
        return $this->hydrator->hydrateEntity($innerEntity)->foo($a);
    }

    function bar(int $b): string
    {
        return $this->hydrator->hydrateEntity($innerEntity)->bar($b);
    }
}