} finally {
            lock.readLock().unlock();
        }
    }

    /**
     * Check if cache entry is expired
     *
     * @return true if expired
     */
    public boolean isExpired() {
        return System.currentTimeMillis() - lastUpdateTime > maxAge;
    }

    /**
     * Check if cache needs refresh
     *
     * @return true if refresh needed
     */

{* ../../docs_src/header_param_models/tutorial001_an_py310.py hl[9:14,18] *}

**FastAPI** will **extract** the data for **each field** from the **headers** in the request and give you the Pydantic model you defined.

## Check the Docs { #check-the-docs }

You can see the required headers in the docs UI at `/docs`:

<div class="screenshot">
<img src="/img/tutorial/header-param-models/image01.png">
</div>

   * this class ({@code Resources}) will be used instead.
   *
   * @throws IllegalArgumentException if the resource is not found
   */
  @CanIgnoreReturnValue // being used to check if a resource exists
  // TODO(cgdecker): maybe add a better way to check if a resource exists
  // e.g. Optional<URL> tryGetResource or boolean resourceExists
  public static URL getResource(String resourceName) {
    ClassLoader loader =

      // boolean condition2 = nodeU().equals(other.nodeV()) && nodeV().equals(other.nodeU());
      // return condition1 || condition2;
      if (nodeU().equals(other.nodeU())) { // check condition1
        // Here's the tricky bit. We don't have to explicitly check for condition2 in this case.
        // Why? The second half of condition2 requires that nodeV equals other.nodeU.

     * If `new PacCredentialType(null)` throws, it implies `isCredentialTypeCorrect()` returned false for null.
     */
    @Test
    void testIsCredentialTypeCorrectWithNullData() {
        // The constructor check `if (!isCredentialTypeCorrect())` handles the null case.
        // We verify that the constructor throws an exception, which indirectly tests the desired logic.

     * transformation has occurred the original artifact is returned.
     *
     * @param artifact           Artifact to be transformed.
     * @param request the repositories to check
     */
    void transformForResolve(Artifact artifact, RepositoryRequest request)
            throws ArtifactResolutionException, ArtifactNotFoundException;

    /**

        Name name = new Name(mockConfig, "TEST", 0x20, null);
        byte[] dst = new byte[100];

        int length = name.writeWireFormat(dst, 0);

        // Check first byte is 0x20
        assertEquals(0x20, dst[0]);

        // Check encoded name (TEST -> encoded as pairs)
        // T = 0x54 -> upper nibble: 0x5 -> 0x46 (F), lower nibble: 0x4 -> 0x45 (E)

        byte[] buffer = new byte[512];
        int written = trans2QueryFSInfo.writeParametersWireFormat(buffer, 0);

        // Should write 2 bytes: information level
        assertEquals(2, written);

        // Check information level (SMB_INFO_ALLOCATION maps to 0x0001)
        int actualInfoLevel = SMBUtil.readInt2(buffer, 0);
        assertEquals(0x0001, actualInfoLevel);
    }

    @Test

{* ../../docs_src/path_params/tutorial002.py hl[7] *}

Bu durumda, `item_id` bir `int` olarak tanımlanacaktır.

/// check | Ek bilgi

Bu sayede, fonksiyon içerisinde hata denetimi, kod tamamlama gibi konularda editör desteğine kavuşacaksınız.

///

Ви можете визначити тип параметра шляху у функції, використовуючи стандартні анотації типів Python:

{* ../../docs_src/path_params/tutorial002.py hl[7] *}

У такому випадку `item_id` визначається як `int`.

/// check | Примітка

Це дасть можливість підтримки редактора всередині функції з перевірками помилок, автодоповнення тощо.

///

## <abbr title="або: серіалізація, парсинг, маршалізація">Перетворення</abbr> даних