NonGoFiles   []string // absolute paths to package non-Go files
	IgnoredFiles []string // absolute paths to ignored source files

	ModulePath    string            // module path (may be "" on module error)
	ModuleVersion string            // module version (may be "" on main module or module error)
	ImportMap     map[string]string // map import path in source code to package path

    private final Set<String> moduleVersions;
    private final long ageMillis;

    public DefaultCachedModuleVersionList(Set<String> moduleVersions, long ageMillis) {
        this.moduleVersions = moduleVersions;
        this.ageMillis = ageMillis;
    }

    @Override
    public Set<String> getModuleVersions() {
        return moduleVersions;
    }

    @Override
    public Duration getAge() {

import javax.annotation.Nullable;
import java.io.File;
import java.time.Duration;
import java.util.Set;

public interface CachePolicy {
    Expiry versionListExpiry(ModuleIdentifier selector, Set<ModuleVersionIdentifier> moduleVersions, Duration age);

    Expiry missingModuleExpiry(ModuleComponentIdentifier component, Duration age);

    Expiry moduleExpiry(ModuleComponentIdentifier component, ResolvedModuleVersion resolvedModuleVersion, Duration age);

    }

    @Override
    public Expiry versionListExpiry(ModuleIdentifier moduleIdentifier, Set<ModuleVersionIdentifier> moduleVersions, Duration age) {
        CachedDependencyResolutionControl dependencyResolutionControl = new CachedDependencyResolutionControl(moduleIdentifier, moduleVersions, age.toMillis(), keepDynamicVersionsFor);