When you install FastAPI with `pip install "fastapi[standard]"` it comes the `standard` group of optional dependencies:

Used by Pydantic:

* <a href="https://github.com/JoshData/python-email-validator" target="_blank"><code>email-validator</code></a> - for email validation.

Used by Starlette:

* <a href="https://www.python-httpx.org" target="_blank"><code>httpx</code></a> - Required if you want to use the `TestClient`.

            public Integer call() throws Exception {
              runLatch.countDown();
              taskLatch.await();
              if (throwException) {
                throw new IllegalStateException("Fail");
              }
              return 25;
            }
          });

  @Override
  protected void setUp() throws Exception {
    super.setUp();

    exec = Executors.newCachedThreadPool();

     * @return the default value
     */
    @Nonnull
    String defaultValue() default "";

    /**
     * is the parameter required?
     * @return <code>true</code> if the Mojo should fail when the parameter cannot be injected
     */
    boolean required() default false;

    /**
     * Specifies that this parameter cannot be configured directly by the user (as in the case of POM-specified

          null -> return // no open event
          true -> return // found open event
          false -> return@loop // this is not the open event so continue
        }
      }
      Assertions.fail<Any>("event $e without matching start event")
    }
  }

  override fun connectStart(
    route: Route,
    call: Call,
  ) = logEvent(ConnectionEvent.ConnectStart(System.nanoTime(), route, call))

                                                        </c:when>
                                                        <c:when test="${data.jobStatus == 'fail'}">
																		<span class="badge bg-danger"><la:message
                                                                                key="labels.joblog_status_fail"/></span>

		closeBitrotWriters(writers)
		if err != nil && !test.shouldFail {
			t.Errorf("Test %d: should pass but failed with: %v", i, err)
		}
		if err == nil && test.shouldFail {
			t.Errorf("Test %d: should fail but it passed", i)
		}
		for i, w := range writers {
			if w == nil {
				disks[i] = OfflineDisk
			}
		}
		if err == nil {
			if length := int64(len(data[test.offset:])); n != length {

    public static final String CONSTRAINTS_EAN_MESSAGE = "{constraints.EAN.message}";

    /** The key of the message: {item} is not a well-formed email address. */
    public static final String CONSTRAINTS_Email_MESSAGE = "{constraints.Email.message}";

    /** The key of the message: Length of {item} must be between {min} and {max}. */

		{"-t", iptablesconstants.RAW, "-D", iptablesconstants.PREROUTING, "-j", ChainInpodPrerouting},
		{"-t", iptablesconstants.RAW, "-D", iptablesconstants.OUTPUT, "-j", ChainInpodOutput},
	}

	// these sometimes fail due to "Device or resource busy"
	optionalDeleteCmds := [][]string{
		// flush-then-delete our created chains
		{"-t", iptablesconstants.MANGLE, "-F", ChainInpodPrerouting},

 *      <td>Specifications for the parameters which this Mojo uses will be provided in <b>parameter</b> sub-elements
 *          in this section.
 *          <br>
 *          <i>NOTE: Parameters are discussed in more detail below.</i>
 *      </td>
 *   </tr>
 * </table>
 * <p>This is only a small set of all the options. A complete list can be found at

```Python hl_lines="14"
{!../../docs_src/background_tasks/tutorial001.py!}
```

`.add_task()` 함수는 다음과 같은 인자를 받습니다 :

- 백그라운드에서 실행되는 작업 함수 (`write_notification`).
- 작업 함수에 순서대로 전달되어야 하는 일련의 인자 (`email`).
- 작업 함수에 전달되어야하는 모든 키워드 인자 (`message="some notification"`).

## 의존성 주입

`BackgroundTasks`를 의존성 주입 시스템과 함께 사용하면 _경로 작동 함수_, 종속성, 하위 종속성 등 여러 수준에서 BackgroundTasks 유형의 매개변수를 선언할 수 있습니다.