Allow to lock entity with EntityManager#refresh()

[michnovka]

Feature Request

Recently I stumbled upon how useless the EntityManager#lock() method is in scenarios where you need up-to-date data during transaction.

Now the way to go is to use $entity = $em->find($entity->id, LockMode::PESSIMISTIC_WRITE);

It would be nice and more readable if we would allow to call EntityManager#refresh() and specify lockMode to acquire a lock on already loaded entity whilst making sure we have the latest version of it at runtime.

Q	A
New Feature	yes
RFC	no
BC Break	no

Summary

I would like to extend the EntityManager#refresh() to:

public function refresh($entity, $lockMode = null)

This will require similar change to UnitOfWork#refresh() signature, but otherwise should be a simple feature to implement.

What do you think?