}

            abstract class IsCi : $ValueSource.name<String, Params> {
                override fun obtain(): String? = parameters.value.orNull
            }

            val ciProvider = providers.of(IsCi::class.java) {
                parameters.value.set(providers.systemProperty("test_is_ci"))
            }

            val isCi = ${inputExpression}
            tasks {
                named("jar") {

            }

            abstract class IsCi : $ValueSource.name<String, Params> {
                override fun obtain(): String? = parameters.value.orNull
            }

            val ciProvider = providers.of(IsCi::class.java) {
                parameters.value.set(providers.systemProperty("test_is_ci"))
            }

            val isCi = ${inputExpression}
            tasks {

import javax.annotation.Nullable;
import java.util.function.BiFunction;

public class BiProvider<R, A, B> extends AbstractMinimalProvider<R> {

    private final Class<R> type;
    private final BiFunction<? super A, ? super B, ? extends R> combiner;
    private final ProviderInternal<A> left;
    private final ProviderInternal<B> right;

	"istio.io/istio/security/pkg/pki/util"
)

type Signer struct {
	caProvider *caProvider
	CertTTL    time.Duration
}

func NewSigner(signerRoot, signerName string, certificateDuration time.Duration) (*Signer, error) {
	caProvider, err := newCAProvider(signerRoot, signerName)
	if err != nil {
		return nil, err
	}

	ret := &Signer{
		caProvider: caProvider,
		CertTTL:    certificateDuration,
	}
	return ret, nil
}

)

func newCAProvider(caFile, caKeyFile string) (*caProvider, error) {
	caLoader, err := dynamiccertificates.NewDynamicServingContentFromFiles("csr-controller", caFile, caKeyFile)
	if err != nil {
		return nil, fmt.Errorf("error reading CA cert file %q: %v", caFile, err)
	}

	ret := &caProvider{
		caLoader: caLoader,
	}
	if err := ret.setCA(); err != nil {
		return nil, err
	}

            return new BiProvider(String, baseProvider, Providers.of("B"), { a, b -> a + b })
        }
    }

    static class BiProviderRightCircularChainEvaluationTest extends CircularChainEvaluationSpec<String> implements UsesStringProperty {
        ProviderInternal<String> wrapProviderWithProviderUnderTest(ProviderInternal<String> baseProvider) {

	}
	intermediateCA, err := ca.NewIntermediate(strRoot, caConfig, caLoader)
	if err != nil {
		return nil, err
	}
	ret := &caProvider{
		caLoader:       caLoader,
		caIntermediate: intermediateCA,
	}
	if err := ret.setCA(); err != nil {
		return nil, err
	}

	return ret, nil
}

type caProvider struct {
	caValue        atomic.Value
	caLoader       ca.Root
	caIntermediate ca.Intermediate
}