Implementing cache using Guava

Question

I want to implement a cache using Guava's caching mechanism.

I have a DB query which returns a map, I want to cache the entire map but let it expire after a certain amount of time.

I realize Guava caches works as a per-item bases. We provide a key, the Cache will either returns the corresponding value from the cache or get it.

Is there a way to use Guava to get everything, cache it but timeout it after a certain time period of time and get everything again.

Many thanks

LoadingCache is probably what you need. See also this question: stackoverflow.com/questions/11463675/… — user180100
– user180100, Commented Sep 24, 2013 at 15:42
It almost sounds like you want a Cache<Singleton, Map<Key, Value>>, with just a single key. — Louis Wasserman
– Louis Wasserman, Commented Sep 24, 2013 at 16:44
Cache.asMap().putAll(yourMap) could be a solution if you need to cache items in your map. — Andrey Chaschev
– Andrey Chaschev, Commented Sep 24, 2013 at 21:41

Community · Accepted Answer · 2017-05-23 12:10:03Z

2

You can create an instance of Supplier<Map<K,V>> that fetches the entire map from the database, and then use Suppliers.memoizeWithExpiration to cache it.

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answered Sep 24, 2013 at 23:30

David

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