import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

class KeyHasher<K> {
    private final Serializer<K> serializer;
    private final MessageDigestStream digestStream = new MessageDigestStream();
    private final KryoBackedEncoder encoder = new KryoBackedEncoder(digestStream);

    public KeyHasher(Serializer<K> serializer) {
        this.serializer = serializer;
    }

class KeyHasherTest extends Specification {
    def "can reuse to hash more than one key"() {
        def hasher = new KeyHasher(BaseSerializerFactory.LONG_SERIALIZER)

        expect:
        hasher.getHashCode(12L) != hasher.getHashCode(11L)
        hasher.getHashCode(12L) == hasher.getHashCode(12L)
        hasher.getHashCode(12L) == new KeyHasher(BaseSerializerFactory.LONG_SERIALIZER).getHashCode(12L)
    }

    def "can reuse to hash large key"() {

@SuppressWarnings("unchecked")
public class BTreePersistentIndexedCache<K, V> {
    private static final Logger LOGGER = LoggerFactory.getLogger(BTreePersistentIndexedCache.class);
    private final File cacheFile;
    private final KeyHasher<K> keyHasher;
    private final Serializer<V> serializer;
    private final short maxChildIndexEntries;
    private final int minIndexChildNodes;
    private final StateCheckBlockStore store;
    private HeaderBlock header;

Class <org.gradle.cache.internal.btree.KeyHasher$MessageDigestStream> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (KeyHasher.java:0)
Class <org.gradle.cache.internal.btree.KeyHasher> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (KeyHasher.java:0)