```

Nesse caso, a função de manipulação de evento `startup` irá inicializar os itens do "banco de dados" (só um `dict`) com alguns valores.

Você pode adicionar mais que uma função de manipulação de evento.

E sua aplicação não irá começar a receber requisições até que todos os manipuladores de eventos de `startup` sejam concluídos.

### Evento `shutdown`

```

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"`:

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!}
```

package cmd

import (
	"context"
)

const (
	notificationCurrentSendInProgress = "current_send_in_progress"
	notificationEventsErrorsTotal     = "events_errors_total"
	notificationEventsSentTotal       = "events_sent_total"
	notificationEventsSkippedTotal    = "events_skipped_total"
)

var (

		ntargets[k] = v
	}
	return ntargets
}

// Send - sends events to targets identified by target IDs.
func (list *TargetList) Send(event Event, targetIDset TargetIDSet, sync bool) {
	if sync {
		list.sendSync(event, targetIDset)
	} else {
		list.sendAsync(event, targetIDset)
	}
}

func (list *TargetList) sendSync(event Event, targetIDset TargetIDSet) {
	var wg sync.WaitGroup
	for id := range targetIDset {

        }
        canceled -> {
          events += "plan $id TCP connect canceled"
          ConnectResult(this, nextPlan = connectTcpNextPlan, throwable = IOException("canceled"))
        }
        connectTcpNextPlan != null -> {
          events += "plan $id needs follow-up"
          ConnectResult(this, nextPlan = connectTcpNextPlan)
        }
        else -> {
          events += "plan $id TCP connected"

	"github.com/minio/minio/internal/event"
	xhttp "github.com/minio/minio/internal/http"
	"github.com/minio/minio/internal/pubsub"
	"github.com/minio/pkg/v2/policy"
)

// EventNotifier - notifies external systems about events in MinIO.
type EventNotifier struct {
	sync.RWMutex
	targetList     *event.TargetList
	bucketRulesMap map[string]event.RulesMap
}

import org.apache.maven.wagon.TransferFailedException;
import org.apache.maven.wagon.UnsupportedProtocolException;
import org.apache.maven.wagon.Wagon;
import org.apache.maven.wagon.events.TransferEvent;
import org.apache.maven.wagon.events.TransferListener;
import org.apache.maven.wagon.observers.AbstractTransferListener;
import org.apache.maven.wagon.observers.Debug;
import org.codehaus.plexus.testing.PlexusTest;

| `minio_notify_events_errors_total`             | Events that were failed to be sent to the targets (deprecated, please use 'minio_notify_target_failed_events' instead)                      |
| `minio_notify_events_sent_total`               | Total number of events sent to the targets (deprecated, please use 'minio_notify_target_total_events' instead)                              |