/*
 * Copyright (C) 2009 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,

예를 들면 다음과 같습니다.

* 작업을 수행한 후 전송되는 이메일 알림:
    * 이메일 서버에 연결하고 이메일을 전송하는 것은 (몇 초 정도) "느린" 경향이 있으므로, 응답은 즉시 반환하고 이메일 알림은 백그라운드에서 전송할 수 있습니다.
* 데이터 처리:
    * 예를 들어 처리에 오랜 시간이 걸리는 프로세스를 거쳐야 하는 파일을 받았다면, "Accepted"(HTTP 202) 응답을 반환하고 백그라운드에서 파일을 처리할 수 있습니다.

## `BackgroundTasks` 사용 { #using-backgroundtasks }

먼저 `BackgroundTasks`를 임포트하고, `BackgroundTasks` 타입 선언으로 *경로 처리 함수*에 매개변수를 정의합니다:

* Processing data:
    * For example, let's say you receive a file that must go through a slow process, you can return a response of "Accepted" (HTTP 202) and process the file in the background.

## Using `BackgroundTasks` { #using-backgroundtasks }

* Daten verarbeiten:
    * Angenommen, Sie erhalten eine Datei, die einen langsamen Prozess durchlaufen muss. Sie können als Response „Accepted“ (HTTP 202) zurückgeben und die Datei im Hintergrund verarbeiten.

## `BackgroundTasks` verwenden { #using-backgroundtasks }

/*
 * Copyright (C) 2016 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,

* Processamento de dados:
    * Por exemplo, digamos que você receba um arquivo que precisa passar por um processo lento; você pode retornar uma resposta “Accepted” (HTTP 202) e processar o arquivo em segundo plano.

## Usando `BackgroundTasks` { #using-backgroundtasks }

/* Copyright 2020 The TensorFlow Authors. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,

    }

    @Override
    public E aboveSamplesGreater() {
      throw new UnsupportedOperationException();
    }
  }

  /*
   * TODO(cpovirk): surely we can find a less ugly solution than a class that accepts 3 parameters,
   * exposes as many getters, does work in the constructor, and has both a superclass and a subclass
   */
  public static class SortedMapSubmapTestMapGenerator<

      return "Suppliers.synchronizedSupplier(" + delegate + ")";
    }

    @GwtIncompatible @J2ktIncompatible private static final long serialVersionUID = 0;
  }

  /**
   * Returns a function that accepts a supplier and returns the result of invoking {@link
   * Supplier#get} on that supplier.
   *
   * <p>Prefer to use the method reference {@code Supplier::get} instead, though note that it is not

你可以定義背景任務，讓它們在傳回回應之後執行。

這對於那些需要在請求之後發生、但用戶端其實不必在收到回應前等它完成的操作很有用。

例如：

* 在執行某個動作後發送電子郵件通知：
    * 由於連線到郵件伺服器並寄送郵件通常較「慢」（數秒），你可以先立即回應，並在背景中發送郵件通知。
* 處理資料：
    * 例如，收到一個需要經過較慢處理流程的檔案時，你可以先回應「Accepted」（HTTP 202），再在背景處理該檔案。

## 使用 `BackgroundTasks` { #using-backgroundtasks }

首先，匯入 `BackgroundTasks`，並在你的路徑操作函式中定義一個型別為 `BackgroundTasks` 的參數：

{* ../../docs_src/background_tasks/tutorial001_py310.py hl[1,13] *}