* scheduled work.
     *
     * @return {@link Optional#empty() empty} when no failures occur.
     */
    Optional<Throwable> getFailure();

    /**
     * Failure that caused the problem.
     * <p>
     * The method will always return <code>null</code> if run against a Gradle version prior to 8.8.
     * @since 8.7
     */
    @Nullable
    Failure getFailure();

        this.failure = failure;
    }

    @Override
    public ComponentIdentifier getId() {
        return componentIdentifier;
    }

    @Override
    public Throwable getFailure() {
        return failure;
    }

 *
 * Implemented by the Enterprise plugin.
 */
public interface GradleEnterprisePluginEndOfBuildListener {

    interface BuildResult {
        @Nullable
        Throwable getFailure();

        Collection<Problem> getProblems();

        Collection<Problem> getProblemsFor(Throwable failure);
    }

    void buildFinished(BuildResult buildResult);

/**
 * Used by the scan plugin to register a listener to be notified about the build finishing.
 */
public interface BuildScanEndOfBuildNotifier {

    interface BuildResult {
        @Nullable
        Throwable getFailure();
    }

    interface BuildScanResult {

    }

    interface Listener {
        /**

    @Nullable
    InternalDetails getDetails();

    List<InternalLocation> getLocations();

    List<InternalSolution> getSolutions();

    @Nullable
    InternalFailure getFailure();

    @Nullable
    InternalContextualLabel getContextualLabel();

    /**
     * Returns the reasons why the failed selector was attempted.
     */
    ComponentSelectionReason getAttemptedReason();

    /**
     * The failure that occurred.
     */
    Throwable getFailure();

        // but we need some way to correlate a given request with a specific response channel
        return Delivery.AllHandlers;
    }

    public Throwable getFailure() {
        return failure;
    }

    DefaultDeploymentStatus(boolean changed, @Nullable Throwable failure) {
        this.changed = changed;
        this.failure = failure;
    }

    @Override
    public Throwable getFailure() {
        return failure;
    }

    @Override
    public boolean hasChanged() {
        return changed;
    }

    @Override
    public String toString() {

     */
    void writeTo(int requestId, HttpExchange exchange) throws IOException;

    /**
     * Returns the failure, if any.
     */
    default RuntimeException getFailure() {
        throw new IllegalStateException();
    }