import java.util.function.Predicate;

/**
 * A feature of a cache-like storage that provides an ability to invalidate the items matching a predicate.
 * @param <T> the type of the stored items.
 */
public interface ConditionalInvalidation<T> {
    /**
     * Instructs the cache to drop the stored items matching the predicate.
     */
    void invalidateItemsMatching(Predicate<T> predicate);

import java.io.IOException;

public class InvalidJvmInstallationCacheInvalidator implements Closeable {

    @Nonnull
    private final ConditionalInvalidation<JvmInstallationMetadata> cache;

    public InvalidJvmInstallationCacheInvalidator(@Nonnull ConditionalInvalidation<JvmInstallationMetadata> cache) {
        this.cache = cache;
    }

    @Override
    public void close() throws IOException {

                if (globalJvmMetadataDetector instanceof ConditionalInvalidation) {
                    // Avoiding generic-unchecked cast with this intermediate implementation that checks the types of the items:
                    ConditionalInvalidation<JvmInstallationMetadata> checkedInvalidationFromDetector =
                        predicate -> ((ConditionalInvalidation<?>) globalJvmMetadataDetector).invalidateItemsMatching(item ->

import spock.lang.Specification

import java.util.function.Predicate

class InvalidJvmInstallationCacheInvalidatorTest extends Specification {
    def 'closing triggers cache invalidation'() {
        def cache = Mock(ConditionalInvalidation<JvmInstallationMetadata>)

        given:
        def invalidator = new InvalidJvmInstallationCacheInvalidator(cache)

        when:
        invalidator.close()

        then:

import java.io.IOException;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.function.Predicate;

public class CachingJvmMetadataDetector implements JvmMetadataDetector, ConditionalInvalidation<JvmInstallationMetadata> {

    private final Map<File, JvmInstallationMetadata> javaMetadata = Collections.synchronizedMap(new HashMap<>());
    private final JvmMetadataDetector delegate;

Class <org.gradle.internal.jvm.inspection.ConditionalInvalidation> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (ConditionalInvalidation.java:0)