使用 `startup` 事件声明 `app` 启动前运行的函数：

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

本例中，`startup` 事件处理器函数为项目数据库（只是**字典**）提供了一些初始值。

**FastAPI** 支持多个事件处理器函数。

只有所有 `startup` 事件处理器运行完毕，**FastAPI** 应用才开始接收请求。

## `shutdown` 事件

使用 `shutdown` 事件声明 `app` 关闭时运行的函数：

```Python hl_lines="6"
{!../../../docs_src/events/tutorial002.py!}
```

```Python hl_lines="14-19"
{!../../../docs_src/events/tutorial003.py!}
```

🥇 🍕 🔢, ⏭ `yield`, 🔜 🛠️ **⏭** 🈸 ▶️.

& 🍕 ⏮️ `yield` 🔜 🛠️ **⏮️** 🈸 ✔️ 🏁.

### 🔁 🔑 👨‍💼

🚥 👆 ✅, 🔢 🎀 ⏮️ `@asynccontextmanager`.

👈 🗜 🔢 🔘 🕳 🤙 "**🔁 🔑 👨‍💼**".

```Python hl_lines="1  13"
{!../../../docs_src/events/tutorial003.py!}
```

    }

    def "forward the event unmodified to the listener"() {
        given:
        def event1 = event("event 1")
        def event2 = event("event 2")

        when:
        renderer.onOutput(event1)
        renderer.onOutput(event2)

        then:
        1 * listener.onOutput(event1)
        1 * listener.onOutput(event2)
        0 * _
    }

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

이 경우 `startup` 이벤트 핸들러 함수는 단순히 몇 가지 값으로 구성된 `dict` 형식의 "데이터베이스"를 초기화합니다.

하나 이상의 이벤트 핸들러 함수를 추가할 수도 있습니다.

그리고 응용 프로그램은 모든 `startup` 이벤트 핸들러가 완료될 때까지 요청을 받지 않습니다.

## `shutdown` 이벤트

응용 프로그램이 종료될 때 실행하려는 함수를 추가하려면 `"shutdown"` 이벤트로 선언합니다:

```Python hl_lines="6"
{!../../../docs_src/events/tutorial002.py!}
```

	}

	// "New" Events need to have EventTime set, so it's validating old object.
	if event.EventTime.Time == zeroTime {
		// Make sure event.Namespace and the involvedInvolvedObject.Namespace agree
		if len(event.InvolvedObject.Namespace) == 0 {
			// event.Namespace must also be empty (or "default", for compatibility with old clients)
			if event.Namespace != metav1.NamespaceNone && event.Namespace != metav1.NamespaceDefault {

	// to the bookmark event.
	//
	// note that we decided to extend the event
	// struct field to eliminate contention
	// between startWatching and processEvent
	isInitialEventsEndBookmark bool
}

// parseKV converts a KeyValue retrieved from an initial sync() listing to a synthetic isCreated event.
func parseKV(kv *mvccpb.KeyValue) *event {
	return &event{
		key:       string(kv.Key),
		value:     kv.Value,
		prevValue: nil,

import (
	"strconv"
	"strings"

	"internal/trace/event"
	"internal/trace/version"
)

// Event is a simple representation of a trace event.
//
// Note that this typically includes much more than just
// timestamped events, and it also represents parts of the
// trace format's framing. (But not interpreted.)
type Event struct {
	Version version.Version
	Ev      event.Type
	Args    []uint64
	Data    []byte
}

)

// Image manager event reason list
const (
	InvalidDiskCapacity = "InvalidDiskCapacity"
	FreeDiskSpaceFailed = "FreeDiskSpaceFailed"
)

// Probe event reason list
const (
	ContainerUnhealthy    = "Unhealthy"
	ContainerProbeWarning = "ProbeWarning"
)

// Pod worker event reason list
const (
	FailedSync = "FailedSync"
)

// Config event reason list
const (

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

        RenderableOutputEvent event1 = new StyledTextOutputEvent(tenAm, 'category', LogLevel.INFO, null, 'message')
        RenderableOutputEvent event2 = new StyledTextOutputEvent(tenAm, 'category', LogLevel.INFO, null, toNative('\n'))

        when:
        renderer.onOutput(new LogLevelChangeEvent(LogLevel.DEBUG))
        renderer.onOutput(event1)
        renderer.onOutput(event2)

        then: