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

Answer 1

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.

Related:

• Google Guava Supplier Example
• http://google.github.io/guava/releases/snapshot/api/docs/com/google/common/base/Supplier.html
• http://google.github.io/guava/releases/snapshot/api/docs/com/google/common/base/Suppliers.html