//   Isolated Projects.
        if (isIsolatedProjects()) {
            gradle.getLifecycle().beforeProject(action::execute);
        } else {
            gradle.allprojects(action);
        }
    }

    private boolean isIsolatedProjects() {
        return features.getIsolatedProjects().getActive().getOrElse(false);
    }

        return executer == Executer.configCache || executer == Executer.isolatedProjects;
    }

    public static boolean isNotIsolatedProjects() {
        return !isIsolatedProjects();
    }

    public static boolean isIsolatedProjects() {
        return getSystemPropertyExecuter() == Executer.isolatedProjects;
    }

    private GradleExecuter gradleExecuter;

     *
     * Uses a build model parameter rather than a start parameter as the latter is not final and can be affected by other options of the build.
     */
    val isIsolatedProjects: Boolean
        get() = modelParameters.isIsolatedProjects
}


private
fun InternalOptions.getInternalFlag(systemPropertyName: String, defaultValue: Boolean = false): Boolean =

            } else {
                registration.addProvider(VintageBuildControllerProvider())
                registration.add(DefaultEnvironment::class.java)
            }
            if (buildModelParameters.isIsolatedProjects) {
                registration.addProvider(ConfigurationCacheIsolatedProjectsProvider())
            } else {
                registration.addProvider(VintageIsolatedProjectsProvider())
            }

                @Override
                public void execute(ToolingModelBuilderRegistry registry) {
                    boolean isolatedProjects = buildModelParameters.isIsolatedProjects();
                    GradleProjectBuilderInternal gradleProjectBuilder = createGradleProjectBuilder(isolatedProjects);

            }
        }

        if (!startParameter.isConfigurationCacheQuiet) {
            if (modelParameters.isIsolatedProjects) {
                IncubationLogger.incubatingFeatureUsed("Isolated projects")
            }
        }
        if (!modelParameters.isIsolatedProjects && modelParameters.isConfigureOnDemand) {
            IncubationLogger.incubatingFeatureUsed("Configuration on demand")
        }

        if (buildActionRequirements.isRunsTasks) {
            appendRequestedTasks()
        }

        putBoolean(startParameter.isOffline)
        putBoolean(startParameter.isIsolatedProjects)
        putBuildScan()
        putBoolean(encryptionConfiguration.isEncrypting)
        putHash(encryptionConfiguration.encryptionKeyHashCode)
    }

    private
    fun Hasher.putBuildScan() {

        this.pluginAdapterFactory = pluginAdapterFactory;
        this.isConfigurationCacheEnabled = buildModelParameters.isConfigurationCache();
        this.isIsolatedProjectsEnabled = buildModelParameters.isIsolatedProjects();
    }

    // Used just for testing
    public static final String UNSUPPORTED_TOGGLE = "org.gradle.internal.unsupported-enterprise-plugin";