This is "synchronous" work, you are "synchronized" with the cashier/cook 👨‍🍳. You have to wait 🕙 and be there at the exact moment that the cashier/cook 👨‍🍳 finishes the burgers and gives them to you, or otherwise, someone else might take them.

<img src="/img/async/parallel-burgers/parallel-burgers-04.png" class="illustration">

Чтобы это понять, представьте такую картину:

### Конкурентные бургеры

<!-- The gender neutral cook emoji "🧑‍🍳" does not render well in browsers. In the meantime, I'm using a mix of male "👨‍🍳" and female "👩‍🍳" cooks. -->

Вы идёте со своей возлюбленной 😍 в фастфуд 🍔 и становитесь в очередь, в это время кассир 💁 принимает заказы у посетителей перед вами.

		if _, err := io.Copy(f, f); err != nil {
			t.Fatalf("failed to read from the file: %v", err)
		}

		if !hook.called || hook.written != 0 || hook.handled || hook.err != nil {
			t.Fatalf("poll.CopyFileRange should be called and return the EINVAL error, but got hook.called=%t, hook.err=%v", hook.called, hook.err)
		}

		// Rewind it.
		if _, err := f.Seek(0, io.SeekStart); err != nil {

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;

// It would be cool if there was a hook that I could use to set up a test environment.
// I want to set up a local/remote repositories for testing but I don't want to have
// to change them when I change the layout of the repositories. So I want to generate

		"/healthz/log",
		"/healthz/ping",
		"/healthz/poststarthook/delegate-post-start-hook",
		"/healthz/poststarthook/generic-apiserver-start-informers",
		"/healthz/poststarthook/max-in-flight-filter",
		"/healthz/poststarthook/storage-object-count-tracker-hook",
		"/healthz/poststarthook/wrapping-post-start-hook",
		"/healthz/wrapping-health",
		"/livez",
		"/livez/delegate-health",
		"/livez/log",

        }
        return OptionalEntity.empty();
    }

    protected OptionalEntity<CharMappingItem> createCharMappingItem(final CreateForm form, final VaErrorHook hook) {
        try {
            return createCharMappingItem(this, form, hook);
        } catch (final ValidationErrorException e) {
            saveToken();
            throw e;
        }
    }

		if n > 0 && !hook.called {
			t.Fatal("expected poll.Splice to be called")
		}

		verifySpliceFds(t, serverDown, hook, "dst")
		verifySpliceFds(t, serverUp, hook, "src")

		// poll.Splice is expected to handle the data transmission successfully.
		if !hook.handled || hook.written != int64(size) || hook.err != nil {

				Policy: hook.Policy,
				Error:  err,
			})
			continue
		} else if !matches {
			continue
		} else if hook.ConfigurationError != nil {
			// The policy matches but there is a configuration error with the
			// policy itself
			relevantHooks = append(relevantHooks, PolicyInvocation[P, B, E]{
				Policy:   hook.Policy,
				Error:    hook.ConfigurationError,
				Resource: matchGVR,

		if reinvokeCtx.IsReinvoke() {
			round = 1
		}

		annotator := newWebhookAnnotator(versionedAttr, round, i, hook.Name, invocation.Webhook.GetConfigurationName())
		changed, err := a.callAttrMutatingHook(ctx, hook, invocation, versionedAttr, annotator, o, round, i)
		ignoreClientCallFailures := hook.FailurePolicy != nil && *hook.FailurePolicy == admissionregistrationv1.Ignore
		rejected := false
		if err != nil {
			switch err := err.(type) {

        createMetadataFile {
            keyServer(keyServerFixture.uri)
        }

        given:
        javaLibrary()
        uncheckedModule("org", "foo", "1.0") {
            withSignature {
                signAsciiArmored(it)
            }
        }
        buildFile << """
            println "Adding hook"
            gradle.buildFinished {