Thread safe swap of entire map in Java

Question

I'm implementing thread-safe map in the spring web service.

The map is such like this.

• The map is read simultaneously in thousands of client threads.
  
• The map's content has to be entirely updated sometimes(about once per hour).

I've chosen ConcurrentHashMap for thread-safe map, but there was no functionality to simply swap its content with newer one, like std::map::swap() in c++.
(I thought that atomic update of the entire content is required for multi-thread environment, maybe I'm wrong)

Is there an alternative map with swap?

Any suggestion or reply will be appreciated. Thanks.