abstract class ChangingDependencyResolutionValue(
        val expireAt: Long
    ) : ConfigurationCacheFingerprint() {
        abstract val reason: String
    }

    class DynamicDependencyVersion(
        val displayName: String,
        expireAt: Long
    ) : ChangingDependencyResolutionValue(expireAt) {
        override val reason: String

        // from one of the configured repositories.
        if (versions.isEmpty()) return
        val expireAt = host.buildStartTime + expiry.keepFor.toMillis()
        onChangingValue(ConfigurationCacheFingerprint.DynamicDependencyVersion(requested.displayName, expireAt))
    }

    override fun onChangingModuleResolve(moduleId: ModuleComponentIdentifier, expiry: Expiry) {
        val expireAt = host.buildStartTime + expiry.keepFor.toMillis()