HashMap with weak values

Question

I\'m implementing a cache for Objects stored persistently. The idea is:

• Method getObjectFromPersistence(long id); ///Takes about 3 seconds
• M

Answer 1

You could start a "cleanup" - Thread every once in a while. Perhaps if your map size exceeds a threshold but at most every 5 minutes .... something like that.

Keep the cleanup cycles short to not block the main functionality.