"fmt"
	"math/rand"
	"net/url"
	"time"

	"github.com/minio/madmin-go/v3"
)

var callhomeLeaderLockTimeout = newDynamicTimeout(30*time.Second, 10*time.Second)

// initCallhome will start the callhome task in the background.
func initCallhome(ctx context.Context, objAPI ObjectLayer) {
	if !globalCallhomeConfig.Enabled() {
		return
	}

	go func() {
		r := rand.New(rand.NewSource(time.Now().UnixNano()))

这些示例刻意保持简单，但展示了整体的工作方式。

在安全相关的章节里，有一些工具函数就是以相同的方式实现的。

如果你理解了这里的内容，你就已经知道那些安全工具在底层是如何工作的。

///

## 带 `yield` 的依赖项、`HTTPException`、`except` 与后台任务 { #dependencies-with-yield-httpexception-except-and-background-tasks }

/// warning | 警告

你很可能不需要了解这些技术细节。

这些细节主要在你的 FastAPI 应用版本低于 0.121.0 且你正遇到带 `yield` 的依赖项问题时才有用。

///

带 `yield` 的依赖项随着时间演进以覆盖不同用例并修复一些问题，下面是变更摘要。

        scenario,
        expectedOutcome);
  }

  @Override
  protected void runTest() throws Throwable {
    FutureTask<@Nullable Void> task = new FutureTask<>(this::runChosenTest, null);
    startThread(task::run);
    awaitUninterruptibly(doingCallLatch);
    long hangDelayMillis =
        (expectedOutcome == Outcome.HANG)
            ? EXPECTED_HANG_DELAY_MILLIS

  }

  /** Tests that the {@link Future#get(long, TimeUnit)} method times out correctly. */
  public void testTimeoutOnGetWorksCorrectly() throws InterruptedException, ExecutionException {

    // The task thread waits for the latch, so we expect a timeout here.
    try {
      future.get(20, MILLISECONDS);
      fail("Should have timed out trying to get the value.");
    } catch (TimeoutException expected) {
    } finally {

        scenario,
        expectedOutcome);
  }

  @Override
  protected void runTest() throws Throwable {
    FutureTask<@Nullable Void> task = new FutureTask<>(this::runChosenTest, null);
    startThread(task::run);
    awaitUninterruptibly(doingCallLatch);
    long hangDelayMillis =
        (expectedOutcome == Outcome.HANG)
            ? EXPECTED_HANG_DELAY_MILLIS

The build session state also includes "cross session" state that is shared with any "nested" sessions that need to be created.
This only happens when the `GradleBuild` task is used. You can mostly ignore the distinction between "cross session" and "build session" state.

### Build tree state

"Build tree" is another name for the build definition.

import org.jspecify.annotations.Nullable;

/**
 * {@link Error} variant of {@link java.util.concurrent.ExecutionException}. As with {@code
 * ExecutionException}, the error's {@linkplain #getCause() cause} comes from a failed task,
 * possibly run in another thread. That cause should itself be an {@code Error}; if not, use {@code
 * ExecutionException} or {@link UncheckedExecutionException}. This allows the client code to

    #
    #; isLoggingReplaceSql = true
    # - - - - - - - - - -/

    # /- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    # o isErrorSqlContinue: (NotRequired - Default false)
    #  Does it continue the task when error SQL exists?
    #
    #; isErrorSqlContinue = false
    # - - - - - - - - - -/

    # /- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    # o sqlFileEncoding: (NotRequired - Default 'UTF-8')

這些範例刻意保持簡單，但展示了整個機制如何運作。

在關於安全性的章節裡，有一些工具函式也是用同樣的方式實作。

如果你理解了以上內容，你其實已經知道那些安全性工具在底層是如何運作的。

///

## 同時含有 `yield`、`HTTPException`、`except` 與背景任務的相依 { #dependencies-with-yield-httpexception-except-and-background-tasks }

/// warning | 警告

你很可能不需要這些技術細節。

這些細節主要在於：如果你有一個 0.121.0 之前的 FastAPI 應用，並且在使用含有 `yield` 的相依時遇到問題，會對你有幫助。

///

含有 `yield` 的相依隨著時間演進，以涵蓋不同的使用情境並修正一些問題。以下是變更摘要。

    private fun BaseGradleBuildType.getGradleTasks(): String {
        val runnerStep = this.steps.items.find { it.name == "GRADLE_RUNNER" } as GradleBuildStep
        return runnerStep.tasks!!
    }

    private fun BaseGradleBuildType.getGradleParams(): String {
        val runnerStep = this.steps.items.find { it.name == "GRADLE_RUNNER" } as GradleBuildStep
        return runnerStep.gradleParams!!
    }