state = STATE_CLOSED
    }
  }

  /** An HTTP body with a fixed length specified in advance. */
  private inner class FixedLengthSource(private var bytesRemaining: Long) :
    AbstractSource() {
    init {
      if (bytesRemaining == 0L) {
        responseBodyComplete()
      }
    }

    override fun read(
      sink: Buffer,
      byteCount: Long,
    ): Long {

  fun tearDown() {
    taskQueue.shutdown()
    taskQueue.idleLatch().await(10, TimeUnit.SECONDS)
  }

  @Synchronized fun sentPingCount(): Int = sentPingCount

  @Synchronized fun receivedPingCount(): Int = receivedPingCount

  @Synchronized fun receivedPongCount(): Int = receivedPongCount

  @Throws(IOException::class)
  override fun onReadMessage(text: String) {
    listener.onMessage(this, text)
  }

  init {
    // Put a floor on the keep alive duration, otherwise cleanup will spin loop.
    require(keepAliveDuration > 0L) { "keepAliveDuration <= 0: $keepAliveDuration" }
  }

  fun idleConnectionCount(): Int {
    return connections.count {
      it.withLock { it.calls.isEmpty() }
    }
  }

  fun connectionCount(): Int {
    return connections.size
  }

  /**

     */
    private fun isFreshnessLifetimeHeuristic(): Boolean {
      return cacheResponse!!.cacheControl.maxAgeSeconds == -1 && expires == null
    }

    init {
      if (cacheResponse != null) {
        this.sentRequestMillis = cacheResponse.sentRequestAtMillis
        this.receivedResponseMillis = cacheResponse.receivedResponseAtMillis
        val headers = cacheResponse.headers

 */
class DiskLruCache(
  fileSystem: FileSystem,
  /** Returns the directory where this cache stores its data. */
  val directory: Path,
  private val appVersion: Int,
  internal val valueCount: Int,
  /** Returns the maximum number of bytes that this cache should use to store its data. */
  maxSize: Long,
  /** Used for asynchronous journal rebuilds. */
  taskRunner: TaskRunner,

!!! info "정보"
    만약 여러분이 쿠버네티스를 사용하고 있다면, 아마도 이는 <a href="https://kubernetes.io/docs/concepts/workloads/pods/init-containers/" class="external-link" target="_blank">Init Container</a>일 것입니다.

만약 여러분의 이용 사례에서 이전 단계들을 **병렬적으로 여러번** 수행하는데에 문제가 없다면 (예를 들어 데이터베이스 이전을 실행하지 않고 데이터베이스가 준비되었는지 확인만 하는 경우), 메인 프로세스를 시작하기 전에 이 단계들을 각 컨테이너에 넣을 수 있습니다.

### 단일 컨테이너

    private var keyPair: KeyPair? = null
    private var signedBy: HeldCertificate? = null
    private var maxIntermediateCas = -1
    private var keyAlgorithm: String? = null
    private var keySize: Int = 0

    init {
      ecdsa256()
    }

    /**
     * Sets the certificate to be valid in ```[notBefore..notAfter]```. Both endpoints are specified

```Python
user = models.User.select().first()
```

, 🔄, 👥 🔜 📣 *➡ 🛠️ 🔢* & 🔗 🍵 `async def`, ⏮️ 😐 `def`,:

```Python hl_lines="2"
# Something goes here
def read_users(skip: int = 0, limit: int = 100):
    # Something goes here
```

## 🔬 🏒 ⏮️ 🔁

👉 🖼 🔌 ➕ *➡ 🛠️* 👈 🔬 📏 🏭 📨 ⏮️ `time.sleep(sleep_time)`.

⚫️ 🔜 ✔️ 💽 🔗 📂 ▶️ & 🔜 ⌛ 🥈 ⏭ 🙇 🔙. & 🔠 🆕 📨 🔜 ⌛ 🕐 🥈 🌘.

import org.junit.jupiter.api.Test
import org.junit.jupiter.params.ParameterizedTest
import org.junit.jupiter.params.provider.CsvSource
import promotion.PromotionProject

class PromotionProjectTests {
    init {
        DslContext.initForTest()
    }

    @Test
    fun `promotion project has expected build types for master branch`() {
        val model = setupModelFor("master")

    在文档中也有一篇使用 Peewee 的等效的文章。

## 文件结构

对于这些示例，假设您有一个名为的目录`my_super_project`，其中包含一个名为的子目录`sql_app`，其结构如下：

```
.
└── sql_app
    ├── __init__.py
    ├── crud.py
    ├── database.py
    ├── main.py
    ├── models.py
    └── schemas.py
```

该文件`__init__.py`只是一个空文件，但它告诉 Python 其中`sql_app`的所有模块（Python 文件）都是一个包。

现在让我们看看每个文件/模块的作用。

## 安装 SQLAlchemy

先下载`SQLAlchemy`所需要的依赖：

<div class="termy">