How about start a channel to exec callback

[aireet]

Thanks for your open source.

if the CacheTabls's items becomes very long and the 'expirationCheck' is runing with lots of callback function waiting to execute, it will lock the table for so many time. so I think it' better to make a channle to exec the callback function.

[muesli]

If you have a specific implementation in mind, please feel free to open a new pull request.