type SourcesReadyFn func(sourcesSeen sets.Set[string]) bool

// SourcesReady tracks the set of configured sources seen by the kubelet.
type SourcesReady interface {
	// AddSource adds the specified source to the set of sources managed.
	AddSource(source string)
	// AllReady returns true if the currently configured sources have all been seen.
	AllReady() bool
}

// NewSourcesReady returns a SourcesReady with the specified function.

        def classesDir = tmpDir.createDir("classes/$className")
        def compilationUnit = new CompilationUnit(new GroovyClassLoader(getClass().classLoader))
        compilationUnit.addSource(className, classText)

        def configuration = new CompilerConfiguration()
        configuration.setTargetDirectory(classesDir)

        compilationUnit.setConfiguration(configuration)

        def matchingChildren = op.children.findAll { it.hasDetailsOfType(ExecuteListenerBuildOperationType.Details) && it.details.applicationId == expectedApplicationId }
        verifyExpectedOps(matchingChildren, addSource(expectedOps, sourceName))
        matchingChildren
    }

    private static void verifyHasNoChildren(BuildOperationRecord op, long expectedApplicationId) {

}

type sourcesReadyStub struct{}

// PodReusableDevices is a map by pod name of devices to reuse.
type PodReusableDevices map[string]map[string]sets.Set[string]

func (s *sourcesReadyStub) AddSource(source string) {}
func (s *sourcesReadyStub) AllReady() bool          { return true }

// NewManagerImpl creates a new manager.

			klog.ErrorS(nil, "Kubelet does not support snapshot update")
		default:
			klog.ErrorS(nil, "Invalid operation type received", "operation", u.Op)
		}

		kl.sourcesReady.AddSource(u.Source)

	case e := <-plegCh:
		if isSyncPodWorthy(e) {
			// PLEG event for a pod; sync it.
			if pod, ok := kl.podManager.GetPodByUID(e.ID); ok {