// marker interface for cache keys
    }

    @FunctionalInterface
    interface PluginRealmSupplier {
        CacheRecord load() throws PluginResolutionException, PluginContainerException;
    }

    Key createKey(
            Plugin plugin,
            ClassLoader parentRealm,
            Map<String, ClassLoader> foreignImports,
            DependencyFilter dependencyFilter,
            List<RemoteRepository> repositories,

        public String toString() {
            return extensionRealms.toString();
        }
    }

    protected final Map<Key, CacheRecord> cache = new ConcurrentHashMap<>();

    @Override
    public Key createKey(List<? extends ClassRealm> extensionRealms) {
        return new CacheKey(extensionRealms);
    }

    @Override
    public CacheRecord get(Key key) {
        return cache.get(key);
    }

    @Override

        CacheRecord(ClassRealm realm, DependencyFilter extensionArtifactFilter) {
            this.realm = realm;
            this.extensionArtifactFilter = extensionArtifactFilter;
        }
    }

    Key createKey(List<? extends ClassRealm> extensionRealms);

    CacheRecord get(Key key);

    CacheRecord put(Key key, ClassRealm projectRealm, DependencyFilter extensionArtifactFilter);

    void flush();

    /**

		if err != nil {
			log.Fatal(err)
		}
		if strings.HasSuffix(path, ".zip") {
			log.Fatalf("unexpected file during walk: %s", path)
		}
		name := filepath.ToSlash(path)
		w, err := zw.CreateRaw(&zip.FileHeader{
			Name:               name,
			Method:             zip.Store,
			CompressedSize64:   uint64(len(data)),
			UncompressedSize64: uint64(len(data)),
			CRC32:              crc32.ChecksumIEEE(data),
		})

        public String toString() {
            return files.toString();
        }
    }

    protected final Map<Key, CacheRecord> cache = new ConcurrentHashMap<>();

    @Override
    public Key createKey(List<Artifact> extensionArtifacts) {
        return new CacheKey(extensionArtifacts);
    }

    @Override
    public CacheRecord get(Key key) {
        return cache.get(key);
    }

    @Override

    /* Open the file or fail if it does not exist
     * aka OPEN_EXISTING
     */

    static final int FILE_OPEN = 0x1;

    /* Create the file or fail if it does not exist
     * aka CREATE_NEW
     */

    static final int FILE_CREATE = 0x2;

    /* Open the file or create it if it does not exist
     * aka OPEN_ALWAYS
     */

    static final int FILE_OPEN_IF = 0x3;

	HasColumn(dst interface{}, field string) bool
	RenameColumn(dst interface{}, oldName, field string) error
	ColumnTypes(dst interface{}) ([]ColumnType, error)

	// Views
	CreateView(name string, option ViewOption) error
	DropView(name string) error

	// Constraints
	CreateConstraint(dst interface{}, name string) error
	DropConstraint(dst interface{}, name string) error

		return []madmin.KMSKeyInfo{{Name: s.keyID}}, "", nil
	}
	return []madmin.KMSKeyInfo{}, "", nil
}

// CreateKey returns ErrKeyExists unless req.Name is equal to the secretKey name.
// The builtin KMS does not support creating multiple keys.
func (s secretKey) CreateKey(_ context.Context, req *CreateKeyRequest) error {
	if req.Name != s.keyID {
		return ErrNotSupported
	}
	return ErrKeyExists
}

        public Set<Artifact> getArtifacts() {
            return artifacts;
        }

        public LifecycleExecutionException getException() {
            return exception;
        }
    }

    Key createKey(
            MavenProject project,
            Collection<String> scopesToCollect,
            Collection<String> scopesToResolve,
            boolean aggregating,
            RepositorySystemSession session);

        public ExtensionDescriptor getDescriptor() {
            return descriptor;
        }

        public List<Artifact> getArtifacts() {
            return artifacts;
        }
    }

    Key createKey(List<Artifact> extensionArtifacts);

    CacheRecord get(Key key);

    CacheRecord put(
            Key key, ClassRealm extensionRealm, ExtensionDescriptor extensionDescriptor, List<Artifact> artifacts);