WeakRef support

[ronag]

We should test that a WeakRef:d Pool or Client does not get garbage collected while there is an active socket.

So basically if the pool/client has no pending request and idle/keepalive timeout has expired it should be garbage collected, otherwise not.

I think this already works but needs a regression test.

Client has a ref to Pool through onDrain listener and Socket has a ref to Client through [kClient].

I think sockets are GC roots so I believe they will never be GC:d while there is still an active connection.

[ronag]

@Ethan-Arrowood @dnlup Maybe? This can be fun if you want to get more familiar with weak refs.

[dnlup]

To test if it has been garbage collected, we could use deref, right? As for keeping the socket active, is it sufficient to work just with the keepalive timeout, or is it better to send some data (in this case, I don't know how to do it without referencing the Client/Pool atm)? I can try to put something together.

[ronag]

I think you can use finalization registry as well to check for gc

[ronag]

I don't know how to do it without referencing the Client/Pool

I mean you can write something and then null the refs?

[dnlup]

Yup, thanks for the pointers