Remove elements from Guava Cache

Question

I am using import com.google.common.cache.Cache

I have initiated the cache this way:

private Cache<String,String> mycache =CacheBuilder.newBuilder()    .concurrencyLevel(4).expireAfterAccess(30, TimeUnit.MINUTES).build(); 

I am willing to remove entries manually in some scenarios before waiting for the expiration.

The only way I found to do this was this:

mycache.asMap().remove("somekey"); 

I am asking if that is the proper way of doing this? Am I going to have any problems with that?

Answer 1

The proper way of doing it would be to use the invalidate method:

mycache.invalidate("somekey"); 

As specified in the API documentation:

void invalidate(Object key)
Discards any cached value for key key.

Answer 2

You should be using invalidate(key) method to remove individual elements.For bulk removal you can use invalidateAll(keys) method.

In your case you can use

mycache.invalidate("somekey");  

Hope this solves your problem.