!!! note "Technical Details"

👉 👗 ⚙️ `async` & `await` 📶 🆕 🇪🇸.

✋️ ⚫️ ⚒ 👷 ⏮️ 🔁 📟 📚 ⏩.

👉 🎏 ❕ (⚖️ 🌖 🌓) 🔌 ⏳ 🏛 ⏬ 🕸 (🖥 & ✳).

✋️ ⏭ 👈, 🚚 🔁 📟 🌖 🏗 & ⚠.

⏮️ ⏬ 🐍, 👆 💪 ✔️ ⚙️ 🧵 ⚖️ <a href="https://www.gevent.org/" class="external-link" target="_blank">🐁</a>. ✋️ 📟 🌌 🌖 🏗 🤔, ℹ, &amp; 💭 🔃.

⏮️ ⏬ ✳ / 🖥 🕸, 👆 🔜 ✔️ ⚙️ "⏲". ❔ ↘️ <a href="http://callbackhell.com/" class="external-link" target="_blank">⏲ 🔥😈</a>.

## 🔁

👐, ⚫️ 💪 ⚫️, & 📥 👆 🔜 👀 ⚫️❔ ⚫️❔ 📟 👆 ✔️ 🚮 💪 ⚙️ 🏒 ⏮️ FastAPI.

!!! note "📡 ℹ"

import org.apache.maven.api.annotations.Nonnull;

/**
 * Event sent by maven during various phases of the build process.
 * Such events can be listened to using {@link Listener}s objects
 * registered in the {@link Session}.
 *
 * @since 4.0.0
 */
@Experimental
public interface Event {

    /**
     * Gets the type of the event.
     *
     * @return the type of the event, never {@code null}
     */
    @Nonnull

```

In this case, the `startup` event handler function will initialize the items "database" (just a `dict`) with some values.

You can add more than one event handler function.

And your application won't start receiving requests until all the `startup` event handlers have completed.

### `shutdown` event

To add a function that should be run when the application is shutting down, declare it with the event `"shutdown"`:

	UserAgent    string
}

// ToEvent - converts to notification event.
func (args eventArgs) ToEvent(escape bool) event.Event {
	eventTime := UTCNow()
	uniqueID := fmt.Sprintf("%X", eventTime.UnixNano())
	if !args.Object.ModTime.IsZero() {
		uniqueID = fmt.Sprintf("%X", args.Object.ModTime.UnixNano())
	}

	respElements := map[string]string{
		"x-amz-request-id": args.RespElements["requestId"],

	NamespaceFormat = "namespace"

	// AccessFormat - access log format used in some event targets.
	AccessFormat = "access"

	// AMZTimeFormat - event time format.
	AMZTimeFormat = "2006-01-02T15:04:05.000Z"

	// StoreExtension - file extension of an event file in store
	StoreExtension = ".event"
)

// Identity represents access key who caused the event.
type Identity struct {

type GetObjectContext struct {
	OutputRoute string `json:"outputRoute"`
	OutputToken string `json:"outputToken"`
	InputS3URL  string `json:"inputS3Url"`
}

// Event represents lambda function event, this is undocumented in AWS S3. This
// structure bases itself on this structure but there is no binding.
//
//	{
//	  "xAmzRequestId": "a2871150-1df5-4dc9-ad9f-3da283ca1bf3",
//	  "getObjectContext": {
//	    "outputRoute": "...",

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3.sse.internal

internal data class Event(
  val id: String?,
  val type: String?,
  val data: String,

Diese Funktionen können mit `async def` oder normalem `def` deklariert werden.

### `startup`-Event

Um eine Funktion hinzuzufügen, die vor dem Start der Anwendung ausgeführt werden soll, deklarieren Sie diese mit dem Event `startup`:

```Python hl_lines="8"
{!../../../docs_src/events/tutorial001.py!}
```