[Doctrine] Hydration profiling

[Seldaek]

At the moment, the DoctrineDataCollector reports the query duration, but not the time it takes to hydrate. I see a query taking 0.5sec and my controller taking 20seconds in the timeline. If the doctrine pane reported the query as having taken 0.5sec + ~20sec to hydrate, it would be a bit easier to see what the hell is going on.

[stof]

At the moment, the ORM does not provide any way to collect this data

[Seldaek]

Yeah, I checked and I guess it would be doable by extending the EM & wrapping the hydrator, but it's not a small task and it would stop working if people extend the EM themselves.

[stof]

It would not work this way. The hydration is not handled by the EM. Proxies and persistent collections don't use the EM, meaning you would loose many hydrations.

[Seldaek]

Well I don't know if anything else creates hydrators, but extending the EM was just a way to wrap the hydrators so that we can collect info when they're called.

[stof]

As I said previously, both collections and proxies also call the hydrators, without going through the entity manager.

[Seldaek]

And as I said, the goal is just to wrap the hydrators inside the EM. From a quick search the only place where hydrators are instantiate seems to be in EM::newHydrator - if you extend that with:

    public function newHydrator($hydrationMode)
    {
        return new HydratorWrapper(parent::newHydrator($hydrationMode));
    }

Then they should hopefully all be created with wrappers, and passed to the proxies and collections with the wrappers.

The missing piece is an interface for hydrators.

[stof]

Moved as doctrine/DoctrineBundle#109