It depends on your definition of good.
The solution uses sleep for synchronization, so I would not call it a good solution. It does not address the mismatch between synchronous and asynchronous processing and only addresses one of the many API callback scenarios.
On the other hand, it will probably work reliably since the loop blocks your client until the nextValidId callback has taken place (as long as the sleep does not interfere with proper API background message processing).
闯ü谤驳别苍
