Ie. return the previous instace if it exists and otherwise create a new one and remember it.

It seems that I misunderstood

lazy

initialization. I’ve just thought that ‘lazy’ initialized object will be really initialized as soon it gets used.

Could you not create a thread for every message? It's fine to talk top-level.

Thanks. How would you rewrite

get

(in the code above) in a more concise way using lazy?

You can't unfortunately,

Lazy

can't be reset.

Thanks for help.