* this method is guaranteed to be called once the computation is complete.
   *
   * <p>Exceptions thrown by a listener will be propagated up to the executor. Any exception thrown
   * during {@code Executor.execute} (e.g., a {@code RejectedExecutionException} or an exception
   * thrown by {@linkplain MoreExecutors#directExecutor direct execution}) will be caught and
   * logged.
   *

   * to perform more efficiently.
   *
   * <p>An escaper is expected to be able to deal with any {@code char} value, so this method should
   * not throw any exceptions.
   *
   * @param c the character to escape if necessary
   * @return the replacement characters, or {@code null} if no escaping was needed
   */
  protected abstract char @Nullable [] escape(char c);

  /**

        // Test polymorphic behavior
        SearchLogEvent[] events = { event1, event2, event3 };

        for (SearchLogEvent event : events) {
            // All methods should be callable without exceptions
            String id = event.getId();
            Long version = event.getVersionNo();
            Map<String, Object> source = event.toSource();
            String type = event.getEventType();

    - how-to/testing-database.md
- Reference (Code API):
  - reference/index.md
  - reference/fastapi.md
  - reference/parameters.md
  - reference/status.md
  - reference/uploadfile.md
  - reference/exceptions.md
  - reference/dependencies.md
  - reference/apirouter.md
  - reference/background.md
  - reference/request.md
  - reference/websockets.md
  - reference/httpconnection.md
  - reference/response.md

おそらくコードの中で直接使用する必要はないでしょう。

しかし、高度なシナリオのために必要な場合には、カスタムヘッダーを追加することができます:

{* ../../docs_src/handling_errors/tutorial002.py hl[14] *}

## カスタム例外ハンドラのインストール

カスタム例外ハンドラは<a href="https://www.starlette.io/exceptions/" class="external-link" target="_blank">Starletteと同じ例外ユーティリティ</a>を使用して追加することができます。

あなた（または使用しているライブラリ）が`raise`するかもしれないカスタム例外`UnicornException`があるとしましょう。

そして、この例外をFastAPIでグローバルに処理したいと思います。

        // Try to execute - should be blocked with CIFSException
        CIFSException exception = assertThrows(CIFSException.class, () -> {
            circuitBreaker.executeWithCircuitBreaker(() -> "should not execute");
        }, "Circuit breaker should throw CIFSException when open");

        assertTrue(exception.getMessage().contains("Circuit breaker 'test' is open"), "Exception message should indicate circuit is open");
    }

    @Test

   * @throws Exception if unable to load the result
   * @throws InterruptedException if this method is interrupted. {@code InterruptedException} is
   *     treated like any other {@code Exception} in all respects except that, when it is caught,
   *     the thread's interrupt status is set
   */
  public abstract V load(K key) throws Exception;

  /**

var keyInPolicyExceptions = map[string]bool{
	xhttp.AmzSignature: true,
	"File":             true,
	"Policy":           true,

	// MinIO specific exceptions to the general S3 rule above.
	encrypt.SseKmsKeyID:          true,
	encrypt.SseEncryptionContext: true,
	encrypt.SseCustomerAlgorithm: true,
	encrypt.SseCustomerKey:       true,
	encrypt.SseCustomerKeyMD5:    true,

        QueryContext context = new QueryContext("*:*", false);
        MatchAllDocsQuery query = new MatchAllDocsQuery();
        float boost = 1.5f;

        // Execute and ensure no exceptions are thrown
        QueryBuilder result = matchAllQueryCommand.execute(context, query, boost);

        assertNotNull(result);

        // Note: Actual log output verification would require a log appender mock

        value = props.getProperty("jcifs.smb.client.nativeLanMan");
        if (value != null) {
            this.nativeLanMan = value;
        }

        // Dialect version properties - these should throw exceptions for invalid values
        String minVersion = props.getProperty("jcifs.smb.client.minVersion");
        String maxVersion = props.getProperty("jcifs.smb.client.maxVersion");