* Constants\n */\n\nconst elementMap = new Map()\n\nexport default {\n  set(element, key, instance) {\n    if (!elementMap.has(element)) {\n      elementMap.set(element, new Map())\n    }\n\n    const instanceMap = elementMap.get(element)\n\n    // make it clear we only want one instance per element\n    // can be removed later when multiple key/instances are fine to be used\n    if (!instanceMap.has(key) && instanceMap.size !== 0) {\n      // eslint-disable-next-line no-console\n      console.error(`Bootstrap...

   * of ~1/5000, meaning that the other thread's get() call nearly always completes within 20ms if
   * it's going to complete at all).
   *
   * <p>[*] To avoid hangs, I've disabled the in-thread calls. This makes the test take (very
   * roughly) 2.5s longer. (2.5s is also the maximum length of time we will wait for a timed get
   * that is expected to succeed; the fact that the numbers match is only a coincidence.) See the

   * of ~1/5000, meaning that the other thread's get() call nearly always completes within 20ms if
   * it's going to complete at all).
   *
   * <p>[*] To avoid hangs, I've disabled the in-thread calls. This makes the test take (very
   * roughly) 2.5s longer. (2.5s is also the maximum length of time we will wait for a timed get
   * that is expected to succeed; the fact that the numbers match is only a coincidence.) See the

De la même manière que vous voulez vous assurer que votre application est lancée au démarrage, vous voulez probablement aussi vous assurer qu'elle est **redémarrée** après des échecs.

### Nous faisons des erreurs { #we-make-mistakes }

Nous, humains, faisons des **erreurs**, tout le temps. Les logiciels ont presque *toujours* des **bugs** cachés à différents endroits. 🐛

* Docker in Swarm Mode
* Systemd
* Supervisor
* 作为其服务的一部分由云提供商内部处理
* 其他的...

我将在接下来的章节中为您提供更具体的示例。

## 重新启动 { #restarts }

与确保应用程序在启动时运行类似，您可能还想确保它在挂掉后**重新启动**。

### 我们会犯错误 { #we-make-mistakes }

作为人类，我们总是会犯**错误**。 软件几乎*总是*在不同的地方隐藏着**bug**。 🐛

作为开发人员，当我们发现这些bug并实现新功能（也可能添加新bug😅）时，我们会不断改进代码。

### 自动处理小错误 { #small-errors-automatically-handled }

Columns\n//\n// Common styles for small and large grid columns\n\n@if $enable-grid-classes {\n  @include make-grid-columns();\n}\n","/// Grid system\n//\n// Generate semantic grid columns with these mixins.\n\n@mixin make-container($gutter: $grid-gutter-width) {\n  width: 100%;\n  padding-right: $gutter * .5;\n  padding-left: $gutter * .5;\n  margin-right: auto;\n  margin-left: auto;\n}\n\n@mixin make-row($gutter: $grid-gutter-width) {\n  display: flex;\n  flex-wrap: wrap;\n  margin-right: -$gutter *...

## Reinicializações { #restarts }

Semelhante a garantir que seu aplicativo seja executado na inicialização, você provavelmente também deseja garantir que ele seja **reiniciado** após falhas.

### Nós cometemos erros { #we-make-mistakes }

Nós, como humanos, cometemos **erros** o tempo todo. O software quase *sempre* tem **bugs** escondidos em lugares diferentes. 🐛

* Supervisor
* 클라우드 제공자가 서비스 일부로 내부적으로 처리
* 기타...

다음 장에서 더 구체적인 예시를 제공하겠습니다.

## 재시작 { #restarts }

애플리케이션이 시작 시 실행되도록 보장하는 것과 비슷하게, 장애가 발생했을 때 **재시작**되도록 보장하고 싶을 것입니다.

### 우리는 실수합니다 { #we-make-mistakes }

사람은 언제나 **실수**합니다. 소프트웨어에는 거의 *항상* 여기저기에 숨은 **버그**가 있습니다. 🐛

그리고 개발자는 버그를 발견하고 새로운 기능을 구현하면서 코드를 계속 개선합니다(새로운 버그도 추가할 수 있겠죠 😅).

### 작은 오류는 자동으로 처리됨 { #small-errors-automatically-handled }

            throw new SearchEngineClientException("[" + index + "] Failed to set " + value + " to " + field + " for doc " + id, e);
        }
    }

    /**
     * Refreshes the specified indices to make recent changes visible for search.
     *
     * @param indices the indices to refresh
     */
    public void refresh(final String... indices) {

    )
    val response = getResponse(newRequest("/"))
    assertContent("This is the 2nd server!", response)
    assertThat(response.request.url).isEqualTo(
      server2.url("/"),
    )

    // make sure the first server was careful to recycle the connection
    assertContent("This is the first server again!", getResponse(Request(server.url("/"))))