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@ThreadSafe @Deprecated public interface KeyFilter<K> extends Predicate<K>Deprecated.since 9.3 This will be replaced by
Predicatein the futureA filter for keys. This class is complemented by the
KeyValueFilterclass. This class is useful for cases when it may be more beneficial to not have the values available. This would include cache loaders since many implementations it may incur additional performance costs just to resurrect the values in addition to any keys.
- Manik Surtani
static final KeyFilter ACCEPT_ALL_FILTERDeprecated.