The javax.cache.configuration.Factory
implementations configure features like
CacheEntryListener
, ExpirePolicy
, and CacheLoader
s or CacheWriter
s. These factory implementations are required to distribute the
different features to members in a cluster environment like Hazelcast. Therefore, these factory implementations have to be serializable.
Factory
implementations are easy to do, as they follow the default Provider- or Factory-Pattern. The sample class
UserCacheEntryListenerFactory
shown below implements a custom JCache Factory
.
public class UserCacheEntryListenerFactory
implements Factory<CacheEntryListener<Integer, User>> {
@Override
public CacheEntryListener<Integer, User> create() {
// Just create a new listener instance
return new UserCacheEntryListener();
}
}
To simplify the process for the users, JCache API offers a set of helper methods collected in
javax.cache. configuration.FactoryBuilder
. In the above configuration example, FactoryBuilder::factoryOf
creates a
singleton factory for the given instance.