annotatedTypeExists()
          ? NullnessAnnotationReader.FROM_DECLARATION_AND_TYPE_USE_ANNOTATIONS
          : NullnessAnnotationReader.FROM_DECLARATION_ANNOTATIONS_ONLY;

  /**
   * Looks for declaration nullness annotations and, if supported, type-use nullness annotations.
   *
   * <p>Under Android VMs, the methods for retrieving type-use annotations don't exist. This means

さらに、フロントエンドが**ユーザー名**と**パスワード**を使って、バックエンドで認証する方法を用意したいです。

**FastAPI**では、これを**OAuth2**を使用して構築できます。

ですが、ちょっとした必要な情報を探すために、長い仕様のすべてを読む必要はありません。

**FastAPI**が提供するツールを使って、セキュリティを制御してみましょう。

## どう見えるか { #how-it-looks }

まずはこのコードを使って、どう動くか観察します。その後で、何が起こっているのか理解しましょう。

## `main.py`を作成 { #create-main-py }

`main.py`に、下記の例をコピーします:

{* ../../docs_src/security/tutorial001_an_py310.py *}

## 実行 { #run-it }

			name:   "list keys as user set policy that allows listing but denies specific keys",
			method: http.MethodGet,
			path:   kmsKeyListPath,
			query:  map[string]string{"pattern": "*"},
			asRoot: false,

			// It looks like this should allow listing any key that isn't "default-test-key", however
			// the policy engine matches all Deny statements first, without regard to Resources (for KMS).

  static final String ERROR_SELF_LOOP = "self-loops are not allowed";
  static final String ERROR_ADDED_SELF_LOOP = "Should not be allowed to add a self-loop edge.";

  /** Creates and returns an instance of the graph to be tested. */
  abstract Graph<Integer> createGraph();

  /**
   * A proxy method that adds the node {@code n} to the graph being tested. In case of Immutable

		progressTickerC = progressTicker.C
	}
	recordStagingTicker := time.NewTicker(500 * time.Millisecond)

	// Exit conditions:
	//
	// 1. If a writer.write() returns false, select loop below exits and
	// closes `doneCh` to indicate to caller to also exit.
	//
	// 2. If caller (Evaluate()) has an error, it sends an error
	// message and waits for this go-routine to quit in
	// FinishWithError()
	//

	d.depth++
	if d.maxDepth > 0 && d.depth > d.maxDepth {
		return nil, ErrMaxDepth
	}

	var (
		c     byte
		v     any
		err   error
		array = make([]any, 0)
	)

	// look ahead for ] - if the array is empty.
	if c = d.skipSpaces(); c == ']' {
		goto out
	}

scan:
	if v, err = d.emitAny(); err != nil {
		goto out
	}

      if (initialized) {
        cleanupQueue.schedule(cleanupTask) // Trim the existing store if necessary.
      }
    }

  /*
   * This cache uses a journal file named "journal". A typical journal file looks like this:
   *
   *     libcore.io.DiskLruCache
   *     1
   *     100
   *     2
   *
   *     CLEAN 3400330d1dfc7f3f7f4b8d4d803dfcf6 832 21054
   *     DIRTY 335c4c6028171cfddfbaae1a9c313c52

   */
  @Override
  boolean isDirected();

  /**
   * Returns true if this graph allows self-loops (edges that connect a node to itself). Attempting
   * to add a self-loop to a graph that does not allow them will throw an {@link
   * IllegalArgumentException}.
   */
  @Override
  boolean allowsSelfLoops();

  /** Returns the order of iteration for the elements of {@link #nodes()}. */

                for (Integer node : graph.nodes()) {
                  Set<Integer> unused = graph.successors(node);
                }
                /*
                 * Also look up an earlier node so that, if the graph is using MapRetrievalCache,
                 * we read one of the fields declared in that class.
                 */
                Set<Integer> unused = graph.successors(first);

  }

  public void testManualServiceFailureIdempotence() {
    ManualSwitchedService service = new ManualSwitchedService();
    /*
     * Set up a RecordingListener to perform its built-in assertions, even though we won't look at
     * its state history.
     */
    RecordingListener unused = RecordingListener.record(service);
    service.startAsync();
    service.notifyFailed(new Exception("1"));