【client-go v0.36.1】WorkQueue 深度分析(上篇)— 模块定位、结构、基础队列与延迟队列

WorkQueue 深度分析(上篇)--- 模块定位、结构、基础队列与延迟队列

基于 client-go v0.36.1 util/workqueue/ 源码的超深度、逐行、专业级分析

源文件:queue.go (370行) + delaying_queue.go (369行) + rate_limiting_queue.go (147行) + default_rate_limiters.go (295行) + metrics.go (255行) + parallelizer.go (101行)


一、模块定位

1.1 业务职责与功能定位

WorkQueue 是 Kubernetes Controller 标准编程模式中的消费侧核心组件。当 Informer 通过 ResourceEventHandler 感知到资源变更时,不是直接调谐,而是将对象的 key 入队 WorkQueue,由 Worker 协程从队列取出 key 进行调谐。

核心职责

职责 描述
去重 同一 key 在处理期间再次 Add 不会重复入队,但标记为 dirty 确保处理完后重新处理
延迟入队 处理失败后延迟重试(指数退避),避免热循环
限流 全局令牌桶 + 单 item 指数退避双重限流
优雅关闭 ShutDown 立即停止 / ShutDownWithDrain 等待所有 item 处理完成
指标 队列深度、入队延迟、处理耗时、重试次数

WorkQueue 解决的核心问题:Controller 调谐失败后如何安全重试?------指数退避 + 去重 + 限流。

1.2 在系统中的位置

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WorkQueue (本次分析)
Informer Pipeline
queue.Add(key)
AddRateLimited → AddAfter
延迟到期 → Add
Get() → key
失败: queue.AddRateLimited(key)
成功: queue.Forget(key)
kube-apiserver
Reflector
DeltaFIFO
Controller
Store
sharedProcessor
TypedT

(基础去重队列)
delayingTypeT

(延迟队列)
rateLimitingTypeT

(限流队列)
EventHandler.OnAdd/OnUpdate/OnDelete
Worker 协程

for { key := queue.Get() ... queue.Done(key) }
调谐逻辑

计算期望状态 → API Server

三层嵌套:RateLimitingQueue → DelayingQueue → Queue。每一层添加一个能力维度。

1.3 数据流入流出

输入

  • EventHandler 调用 queue.Add(key) --- 将资源 key(如 default/nginx-pod)入队
  • 调谐失败调用 queue.AddRateLimited(key) --- 带延迟的重新入队
  • 调谐成功调用 queue.Forget(key) --- 清除限流计数

输出

  • Worker 调用 queue.Get() --- 取出 key 进行调谐
  • Worker 调用 queue.Done(key) --- 标记处理完成

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WorkQueue
入队端
Add(key)
AddRateLimited(key)
AddAfter(key, duration)
Queue (去重)
DelayingQueue (延迟)
RateLimitingQueue (限流)
Get() → (key, shutdown)
Done(key)
Forget(key)


二、模块整体结构

2.1 接口层次与类结构

渲染错误: Mermaid 渲染失败: Parse error on line 35: ... -stopCh chan struct{} -stopOnce -----------------------^ Expecting 'STRUCT_STOP', 'MEMBER', got 'OPEN_IN_STRUCT'

2.2 TypedT --- 基础队列结构体字段详解

go 复制代码
type Typed[T comparable] struct {
    // ─── 核心:三集合模型 ───

    // queue: 有序队列,决定处理顺序(FIFO)
    // 不变量:queue 中的每个元素一定在 dirty 中,且不在 processing 中
    queue Queue[T]

    // dirty: 需要处理的 item 集合
    // 包含:queue 中的 + 正在处理但又被标记为需要重新处理的
    // 作用:去重,同一 item 不会在 queue 中出现两次
    dirty sets.Set[T]

    // processing: 正在处理的 item 集合
    // 与 dirty 可能重叠:item 正在处理但又被 Add → 留在 dirty,
    // 等 Done 时检查 dirty 再重新入 queue
    processing sets.Set[T]

    // ─── 同步原语 ───

    // cond: 条件变量,用于 Get() 阻塞等待
    // 绑定 mutex: cond.L 是队列的互斥锁
    // Signal: Add/Done 时通知等待的 Get
    // Broadcast: ShutDown 时通知所有等待的 Get
    cond *sync.Cond

    // ─── 关闭状态 ───

    // shuttingDown: 是否正在关闭
    shuttingDown bool

    // drain: 是否等待所有 item 处理完成再关闭
    // ShutDown: drain=false, 立即停止
    // ShutDownWithDrain: drain=true, 等待 processing 清空
    drain bool

    // ─── 指标与配置 ───

    metrics                    queueMetrics[T]
    unfinishedWorkUpdatePeriod time.Duration
    clock                      clock.WithTicker

    // ─── 生命周期管理 ───

    // wg: 等待后台 goroutine 退出
    wg sync.WaitGroup

    // stopCh: 通知后台 goroutine 退出
    stopCh chan struct{}

    // stopOnce: 确保 stopCh 只关闭一次
    stopOnce sync.Once
}

三集合模型核心不变量

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三集合模型
dirty set

(需要处理的)
queue slice

(等待处理的)
processing set

(正在处理的)
queue ⊆ dirty

(queue 中的元素一定在 dirty 中)
queue ∩ processing = ∅

(queue 中的元素不在 processing 中)
dirty ∩ processing ≠ ∅

(可重叠:正在处理又被 Add)

三集合状态转移

操作 dirty queue processing
Add(x) (新 item) +x +x ---
Add(x) (已在 dirty,不在 processing) 不变 不变 (Touch) ---
Add(x) (已在 dirty,也在 processing) 不变 不变 ---
Add(x) (不在 dirty,在 processing) +x 不变 ---
Get() → x -x -x (Pop) +x
Done(x) (dirty 中无 x) --- --- -x
Done(x) (dirty 中有 x) --- +x (重新入队) -x

2.3 delayingTypeT --- 延迟队列字段详解

go 复制代码
type delayingType[T comparable] struct {
    TypedInterface[T]          // 嵌入基础队列,继承 Add/Get/Done/ShutDown

    clock     clock.Clock      // 时钟,可注入 FakeClock 测试
    stopCh    chan struct{}     // 通知 waitingLoop 退出
    stopOnce  sync.Once        // 确保 stopCh 只关闭一次
    heartbeat clock.Ticker     // 心跳定时器(10s),保险机制

    // waitingForAddCh: 接收外部 AddAfter 请求的缓冲通道
    // 容量 1000,避免 AddAfter 阻塞调用方
    waitingForAddCh chan *waitFor[T]

    metrics retryMetrics       // 重试指标
}

waitFor --- 延迟条目

go 复制代码
type waitFor[T any] struct {
    data    T          // 待入队的 item
    readyAt time.Time  // 应该入队的时间
    index   int        // 在优先堆中的索引,heap.Fix 使用
}

waitForPriorityQueue --- 最小堆

go 复制代码
type waitForPriorityQueue[T any] []*waitFor[T]
// 实现 heap.Interface
// 按 readyAt 排序,最近到期的在堆顶(index 0)
// 支持 insert 去重:同一 data 只保留最早 readyAt

2.4 rateLimitingTypeT --- 限流队列字段详解

go 复制代码
type rateLimitingType[T comparable] struct {
    TypedDelayingInterface[T]  // 嵌入延迟队列

    rateLimiter TypedRateLimiter[T]  // 限流器,决定 When(item) 的延迟
}

2.5 核心方法清单

TypedT 基础队列方法

方法 作用 阻塞
Add(item) 标记 item 需要 processing
Len() 返回 queue 长度
Get() 取出下一个 item,阻塞等待
Done(item) 标记 item 处理完成
ShutDown() 关闭队列,不等待处理完成 ❌ (等 wg)
ShutDownWithDrain() 关闭队列,等待处理完成
ShuttingDown() 是否正在关闭

delayingTypeT 延迟队列方法

方法 作用
AddAfter(item, duration) 延迟 duration 后入队
ShutDown() 关闭延迟队列
waitingLoop() 后台协程:优先堆 + 定时器调度

rateLimitingTypeT 限流队列方法

方法 作用
AddRateLimited(item) 通过限流器计算延迟后 AddAfter
Forget(item) 清除 item 的失败计数
NumRequeues(item) 返回 item 的重试次数

2.6 内部调用关系

#mermaid-svg-dYIwtVFl7bZRGsf2{font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-dYIwtVFl7bZRGsf2 .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-dYIwtVFl7bZRGsf2 .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-dYIwtVFl7bZRGsf2 .error-icon{fill:#552222;}#mermaid-svg-dYIwtVFl7bZRGsf2 .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-dYIwtVFl7bZRGsf2 .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-dYIwtVFl7bZRGsf2 .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-dYIwtVFl7bZRGsf2 .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-dYIwtVFl7bZRGsf2 .edge-thickness-invisible{stroke-width:0;fill:none;}#mermaid-svg-dYIwtVFl7bZRGsf2 .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-dYIwtVFl7bZRGsf2 .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-dYIwtVFl7bZRGsf2 .marker{fill:#333333;stroke:#333333;}#mermaid-svg-dYIwtVFl7bZRGsf2 .marker.cross{stroke:#333333;}#mermaid-svg-dYIwtVFl7bZRGsf2 svg{font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-dYIwtVFl7bZRGsf2 p{margin:0;}#mermaid-svg-dYIwtVFl7bZRGsf2 .label{font-family:"trebuchet ms",verdana,arial,sans-serif;color:#333;}#mermaid-svg-dYIwtVFl7bZRGsf2 .cluster-label text{fill:#333;}#mermaid-svg-dYIwtVFl7bZRGsf2 .cluster-label span{color:#333;}#mermaid-svg-dYIwtVFl7bZRGsf2 .cluster-label span p{background-color:transparent;}#mermaid-svg-dYIwtVFl7bZRGsf2 .label text,#mermaid-svg-dYIwtVFl7bZRGsf2 span{fill:#333;color:#333;}#mermaid-svg-dYIwtVFl7bZRGsf2 .node rect,#mermaid-svg-dYIwtVFl7bZRGsf2 .node circle,#mermaid-svg-dYIwtVFl7bZRGsf2 .node ellipse,#mermaid-svg-dYIwtVFl7bZRGsf2 .node polygon,#mermaid-svg-dYIwtVFl7bZRGsf2 .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-dYIwtVFl7bZRGsf2 .rough-node .label text,#mermaid-svg-dYIwtVFl7bZRGsf2 .node .label text,#mermaid-svg-dYIwtVFl7bZRGsf2 .image-shape .label,#mermaid-svg-dYIwtVFl7bZRGsf2 .icon-shape .label{text-anchor:middle;}#mermaid-svg-dYIwtVFl7bZRGsf2 .node .katex path{fill:#000;stroke:#000;stroke-width:1px;}#mermaid-svg-dYIwtVFl7bZRGsf2 .rough-node .label,#mermaid-svg-dYIwtVFl7bZRGsf2 .node .label,#mermaid-svg-dYIwtVFl7bZRGsf2 .image-shape .label,#mermaid-svg-dYIwtVFl7bZRGsf2 .icon-shape .label{text-align:center;}#mermaid-svg-dYIwtVFl7bZRGsf2 .node.clickable{cursor:pointer;}#mermaid-svg-dYIwtVFl7bZRGsf2 .root .anchor path{fill:#333333!important;stroke-width:0;stroke:#333333;}#mermaid-svg-dYIwtVFl7bZRGsf2 .arrowheadPath{fill:#333333;}#mermaid-svg-dYIwtVFl7bZRGsf2 .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-dYIwtVFl7bZRGsf2 .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-dYIwtVFl7bZRGsf2 .edgeLabel{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-dYIwtVFl7bZRGsf2 .edgeLabel p{background-color:rgba(232,232,232, 0.8);}#mermaid-svg-dYIwtVFl7bZRGsf2 .edgeLabel rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-dYIwtVFl7bZRGsf2 .labelBkg{background-color:rgba(232, 232, 232, 0.5);}#mermaid-svg-dYIwtVFl7bZRGsf2 .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-dYIwtVFl7bZRGsf2 .cluster text{fill:#333;}#mermaid-svg-dYIwtVFl7bZRGsf2 .cluster span{color:#333;}#mermaid-svg-dYIwtVFl7bZRGsf2 div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-dYIwtVFl7bZRGsf2 .flowchartTitleText{text-anchor:middle;font-size:18px;fill:#333;}#mermaid-svg-dYIwtVFl7bZRGsf2 rect.text{fill:none;stroke-width:0;}#mermaid-svg-dYIwtVFl7bZRGsf2 .icon-shape,#mermaid-svg-dYIwtVFl7bZRGsf2 .image-shape{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-dYIwtVFl7bZRGsf2 .icon-shape p,#mermaid-svg-dYIwtVFl7bZRGsf2 .image-shape p{background-color:rgba(232,232,232, 0.8);padding:2px;}#mermaid-svg-dYIwtVFl7bZRGsf2 .icon-shape .label rect,#mermaid-svg-dYIwtVFl7bZRGsf2 .image-shape .label rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-dYIwtVFl7bZRGsf2 .label-icon{display:inline-block;height:1em;overflow:visible;vertical-align:-0.125em;}#mermaid-svg-dYIwtVFl7bZRGsf2 .node .label-icon path{fill:currentColor;stroke:revert;stroke-width:revert;}#mermaid-svg-dYIwtVFl7bZRGsf2 :root{--mermaid-font-family:"trebuchet ms",verdana,arial,sans-serif;} RateLimiter 实现
Queue (最内层)
DelayingQueue (中间层)
RateLimitingQueue (最外层)
duration>0
duration≤0
DefaultControllerRateLimiter
AddRateLimited(item)
Forget(item)
NumRequeues(item)
rateLimiter.When(item) → duration
AddAfter(item, duration)
waitingLoop() (后台协程)
waitForPriorityQueue (最小堆)
insert() 去重+更新
到期 → Add(item)
Add(item)
Get()
Done(item)
ShutDown()
ShutDownWithDrain()
ItemExponentialFailureRateLimiter

baseDelay×2^failures
BucketRateLimiter

10 QPS, burst 100
MaxOfRateLimiter

max(exp, bucket)
ItemFastSlowRateLimiter
WithMaxWaitRateLimiter


三、核心业务逻辑深度解析 --- 基础队列 (queue.go)

3.1 Add --- 入队逻辑

go 复制代码
func (q *Typed[T]) Add(item T) {
    // ─── 步骤1: 加锁 ───
    q.cond.L.Lock()
    defer q.cond.L.Unlock()

    // ─── 步骤2: 关闭检查 ───
    if q.shuttingDown {
        return
        // 队列已关闭 → 静默忽略新 item
        // 不报错,不 panic,这是有意的设计
    }

    // ─── 步骤3: 去重检查 ───
    if q.dirty.Has(item) {
        // item 已在 dirty 集合中(需要处理但尚未处理完)
        if !q.processing.Has(item) {
            // item 在 dirty 但不在 processing
            // 说明 item 在 queue 中等待,尚未被 Get
            // 调用 Touch:允许优先队列实现更新优先级
            q.queue.Touch(item)
        }
        // 如果 item 同时在 processing → 什么都不做
        // 因为 processing + dirty 意味着处理完后会自动重新入队
        return
    }

    // ─── 步骤4: 新 item ───
    q.metrics.add(item)           // 指标:adds++ + depth++

    q.dirty.Insert(item)          // 标记为需要处理
    if q.processing.Has(item) {
        // item 正在被处理 → 只加入 dirty,不加入 queue
        // Done 时会检查 dirty,自动重新入队
        return
    }

    // ─── 步骤5: 入队 + 唤醒 ───
    q.queue.Push(item)            // 实际入队
    q.cond.Signal()               // 唤醒一个阻塞的 Get
}

Add 的四象限决策
#mermaid-svg-FUTiHNfuZ37P4qKO{font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-FUTiHNfuZ37P4qKO .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-FUTiHNfuZ37P4qKO .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-FUTiHNfuZ37P4qKO .error-icon{fill:#552222;}#mermaid-svg-FUTiHNfuZ37P4qKO .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-FUTiHNfuZ37P4qKO .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-FUTiHNfuZ37P4qKO .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-FUTiHNfuZ37P4qKO .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-FUTiHNfuZ37P4qKO .edge-thickness-invisible{stroke-width:0;fill:none;}#mermaid-svg-FUTiHNfuZ37P4qKO .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-FUTiHNfuZ37P4qKO .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-FUTiHNfuZ37P4qKO .marker{fill:#333333;stroke:#333333;}#mermaid-svg-FUTiHNfuZ37P4qKO .marker.cross{stroke:#333333;}#mermaid-svg-FUTiHNfuZ37P4qKO svg{font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-FUTiHNfuZ37P4qKO p{margin:0;}#mermaid-svg-FUTiHNfuZ37P4qKO .label{font-family:"trebuchet ms",verdana,arial,sans-serif;color:#333;}#mermaid-svg-FUTiHNfuZ37P4qKO .cluster-label text{fill:#333;}#mermaid-svg-FUTiHNfuZ37P4qKO .cluster-label span{color:#333;}#mermaid-svg-FUTiHNfuZ37P4qKO .cluster-label span p{background-color:transparent;}#mermaid-svg-FUTiHNfuZ37P4qKO .label text,#mermaid-svg-FUTiHNfuZ37P4qKO span{fill:#333;color:#333;}#mermaid-svg-FUTiHNfuZ37P4qKO .node rect,#mermaid-svg-FUTiHNfuZ37P4qKO .node circle,#mermaid-svg-FUTiHNfuZ37P4qKO .node ellipse,#mermaid-svg-FUTiHNfuZ37P4qKO .node polygon,#mermaid-svg-FUTiHNfuZ37P4qKO .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-FUTiHNfuZ37P4qKO .rough-node .label text,#mermaid-svg-FUTiHNfuZ37P4qKO .node .label text,#mermaid-svg-FUTiHNfuZ37P4qKO .image-shape .label,#mermaid-svg-FUTiHNfuZ37P4qKO .icon-shape .label{text-anchor:middle;}#mermaid-svg-FUTiHNfuZ37P4qKO .node .katex path{fill:#000;stroke:#000;stroke-width:1px;}#mermaid-svg-FUTiHNfuZ37P4qKO .rough-node .label,#mermaid-svg-FUTiHNfuZ37P4qKO .node .label,#mermaid-svg-FUTiHNfuZ37P4qKO .image-shape .label,#mermaid-svg-FUTiHNfuZ37P4qKO .icon-shape .label{text-align:center;}#mermaid-svg-FUTiHNfuZ37P4qKO .node.clickable{cursor:pointer;}#mermaid-svg-FUTiHNfuZ37P4qKO .root .anchor path{fill:#333333!important;stroke-width:0;stroke:#333333;}#mermaid-svg-FUTiHNfuZ37P4qKO .arrowheadPath{fill:#333333;}#mermaid-svg-FUTiHNfuZ37P4qKO .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-FUTiHNfuZ37P4qKO .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-FUTiHNfuZ37P4qKO .edgeLabel{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-FUTiHNfuZ37P4qKO .edgeLabel p{background-color:rgba(232,232,232, 0.8);}#mermaid-svg-FUTiHNfuZ37P4qKO .edgeLabel rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-FUTiHNfuZ37P4qKO .labelBkg{background-color:rgba(232, 232, 232, 0.5);}#mermaid-svg-FUTiHNfuZ37P4qKO .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-FUTiHNfuZ37P4qKO .cluster text{fill:#333;}#mermaid-svg-FUTiHNfuZ37P4qKO .cluster span{color:#333;}#mermaid-svg-FUTiHNfuZ37P4qKO div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-FUTiHNfuZ37P4qKO .flowchartTitleText{text-anchor:middle;font-size:18px;fill:#333;}#mermaid-svg-FUTiHNfuZ37P4qKO rect.text{fill:none;stroke-width:0;}#mermaid-svg-FUTiHNfuZ37P4qKO .icon-shape,#mermaid-svg-FUTiHNfuZ37P4qKO .image-shape{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-FUTiHNfuZ37P4qKO .icon-shape p,#mermaid-svg-FUTiHNfuZ37P4qKO .image-shape p{background-color:rgba(232,232,232, 0.8);padding:2px;}#mermaid-svg-FUTiHNfuZ37P4qKO .icon-shape .label rect,#mermaid-svg-FUTiHNfuZ37P4qKO .image-shape .label rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-FUTiHNfuZ37P4qKO .label-icon{display:inline-block;height:1em;overflow:visible;vertical-align:-0.125em;}#mermaid-svg-FUTiHNfuZ37P4qKO .node .label-icon path{fill:currentColor;stroke:revert;stroke-width:revert;}#mermaid-svg-FUTiHNfuZ37P4qKO :root{--mermaid-font-family:"trebuchet ms",verdana,arial,sans-serif;} Yes
No
在 dirty, 不在 processing
在 dirty, 在 processing
不在 dirty, 不在 processing
不在 dirty, 在 processing
Add(item)
dirty.Has(item)?
processing.Has(item)?
新 item:

dirty.Insert + queue.Push + Signal
Touch(item)

(更新优先级)
只 dirty.Insert

(Done 时会重新入队)

3.2 Get --- 出队逻辑

go 复制代码
func (q *Typed[T]) Get() (item T, shutdown bool) {
    // ─── 步骤1: 加锁 ───
    q.cond.L.Lock()
    defer q.cond.L.Unlock()

    // ─── 步骤2: 阻塞等待 ───
    for q.queue.Len() == 0 && !q.shuttingDown {
        q.cond.Wait()
        // 释放锁 → 阻塞 → 被 Signal/Broadcast 唤醒 → 重新获取锁
        // 被唤醒的场景:
        //   1. Add 入队 → cond.Signal()
        //   2. Done 且 dirty 有 item → cond.Signal()
        //   3. ShutDown → cond.Broadcast()
    }

    // ─── 步骤3: 关闭检查 ───
    if q.queue.Len() == 0 {
        // 退出 for 循环但 queue 为空 → 说明 shuttingDown=true
        return *new(T), true
        // 返回零值 + shutdown=true
        // 调用方应退出 worker 协程
    }

    // ─── 步骤4: 出队 ───
    item = q.queue.Pop()          // FIFO 出队

    q.metrics.get(item)           // 指标:depth-- + 记录 latency

    q.processing.Insert(item)     // 标记为正在处理
    q.dirty.Delete(item)          // 从 dirty 移除
    // 注意:如果 Add 在 processing 期间又标记了 dirty
    // 此时 dirty 中仍有 item,但已经从 queue 移除了
    // 等 Done 时会检查 dirty,重新入队

    return item, false
}

Get 的状态转移
processing set dirty set queue slice TypedT Worker 协程 processing set dirty set queue slice TypedT Worker 协程 #mermaid-svg-b52uVW3khQZRmwDK{font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-b52uVW3khQZRmwDK .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-b52uVW3khQZRmwDK .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-b52uVW3khQZRmwDK .error-icon{fill:#552222;}#mermaid-svg-b52uVW3khQZRmwDK .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-b52uVW3khQZRmwDK .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-b52uVW3khQZRmwDK .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-b52uVW3khQZRmwDK .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-b52uVW3khQZRmwDK .edge-thickness-invisible{stroke-width:0;fill:none;}#mermaid-svg-b52uVW3khQZRmwDK .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-b52uVW3khQZRmwDK .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-b52uVW3khQZRmwDK .marker{fill:#333333;stroke:#333333;}#mermaid-svg-b52uVW3khQZRmwDK .marker.cross{stroke:#333333;}#mermaid-svg-b52uVW3khQZRmwDK svg{font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-b52uVW3khQZRmwDK p{margin:0;}#mermaid-svg-b52uVW3khQZRmwDK .actor{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-b52uVW3khQZRmwDK text.actor>tspan{fill:black;stroke:none;}#mermaid-svg-b52uVW3khQZRmwDK .actor-line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);}#mermaid-svg-b52uVW3khQZRmwDK .innerArc{stroke-width:1.5;stroke-dasharray:none;}#mermaid-svg-b52uVW3khQZRmwDK .messageLine0{stroke-width:1.5;stroke-dasharray:none;stroke:#333;}#mermaid-svg-b52uVW3khQZRmwDK .messageLine1{stroke-width:1.5;stroke-dasharray:2,2;stroke:#333;}#mermaid-svg-b52uVW3khQZRmwDK #arrowhead path{fill:#333;stroke:#333;}#mermaid-svg-b52uVW3khQZRmwDK .sequenceNumber{fill:white;}#mermaid-svg-b52uVW3khQZRmwDK #sequencenumber{fill:#333;}#mermaid-svg-b52uVW3khQZRmwDK #crosshead path{fill:#333;stroke:#333;}#mermaid-svg-b52uVW3khQZRmwDK .messageText{fill:#333;stroke:none;}#mermaid-svg-b52uVW3khQZRmwDK .labelBox{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-b52uVW3khQZRmwDK .labelText,#mermaid-svg-b52uVW3khQZRmwDK .labelText>tspan{fill:black;stroke:none;}#mermaid-svg-b52uVW3khQZRmwDK .loopText,#mermaid-svg-b52uVW3khQZRmwDK .loopText>tspan{fill:black;stroke:none;}#mermaid-svg-b52uVW3khQZRmwDK .loopLine{stroke-width:2px;stroke-dasharray:2,2;stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);}#mermaid-svg-b52uVW3khQZRmwDK .note{stroke:#aaaa33;fill:#fff5ad;}#mermaid-svg-b52uVW3khQZRmwDK .noteText,#mermaid-svg-b52uVW3khQZRmwDK .noteText>tspan{fill:black;stroke:none;}#mermaid-svg-b52uVW3khQZRmwDK .activation0{fill:#f4f4f4;stroke:#666;}#mermaid-svg-b52uVW3khQZRmwDK .activation1{fill:#f4f4f4;stroke:#666;}#mermaid-svg-b52uVW3khQZRmwDK .activation2{fill:#f4f4f4;stroke:#666;}#mermaid-svg-b52uVW3khQZRmwDK .actorPopupMenu{position:absolute;}#mermaid-svg-b52uVW3khQZRmwDK .actorPopupMenuPanel{position:absolute;fill:#ECECFF;box-shadow:0px 8px 16px 0px rgba(0,0,0,0.2);filter:drop-shadow(3px 5px 2px rgb(0 0 0 / 0.4));}#mermaid-svg-b52uVW3khQZRmwDK .actor-man line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-b52uVW3khQZRmwDK .actor-man circle,#mermaid-svg-b52uVW3khQZRmwDK line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;stroke-width:2px;}#mermaid-svg-b52uVW3khQZRmwDK :root{--mermaid-font-family:"trebuchet ms",verdana,arial,sans-serif;} 阻塞等待... Get()cond.L.Lock()for queue.Len()==0 && !shuttingDown { Wait() }被 Signal 唤醒queue.Pop() → itemprocessing.Insert(item)dirty.Delete(item)cond.L.Unlock()(item, false)

3.3 Done --- 完成逻辑

go 复制代码
func (q *Typed[T]) Done(item T) {
    // ─── 步骤1: 加锁 ───
    q.cond.L.Lock()
    defer q.cond.L.Unlock()

    // ─── 步骤2: 指标 ───
    q.metrics.done(item)          // 记录 workDuration

    // ─── 步骤3: 从 processing 移除 ───
    q.processing.Delete(item)

    // ─── 步骤4: 重新入队检查 ───
    if q.dirty.Has(item) {
        // 处理期间又被 Add 标记为需要重新处理
        q.queue.Push(item)       // 重新入队
        q.cond.Signal()          // 唤醒 Get
    } else if q.processing.Len() == 0 {
        // processing 清空 且 dirty 无此 item
        // 唤醒 ShutDownWithDrain 的等待
        // 条件:q.processing.Len() == 0
        q.cond.Signal()
    }
    // 如果 dirty 无此 item 且 processing 不为空 → 不 Signal
    // 等最后一个 item Done 时自然会 Signal
}

Done 的关键设计 :处理期间被 Add → 不立即入 queue,而是等 Done 时再入。这保证了同一 item 不会被并发处理

3.4 ShutDown / ShutDownWithDrain --- 关闭逻辑

go 复制代码
// ShutDown: 立即关闭,不等待处理完成
func (q *Typed[T]) ShutDown() {
    defer q.wg.Wait()           // 等待后台 goroutine 退出
    q.stopOnce.Do(func() {
        defer close(q.stopCh)   // 通知 updateUnfinishedWorkLoop 退出
    })

    q.cond.L.Lock()
    defer q.cond.L.Unlock()

    q.drain = false             // 不等待 drain
    q.shuttingDown = true       // 标记关闭
    q.cond.Broadcast()          // 唤醒所有阻塞的 Get
    // Get 检测到 shuttingDown 且 queue 为空 → 返回 shutdown=true
}

// ShutDownWithDrain: 等待所有 item 处理完成
func (q *Typed[T]) ShutDownWithDrain() {
    defer q.wg.Wait()
    q.stopOnce.Do(func() {
        defer close(q.stopCh)
    })

    q.cond.L.Lock()
    defer q.cond.L.Unlock()

    q.drain = true              // 标记等待 drain
    q.shuttingDown = true       // 标记关闭
    q.cond.Broadcast()          // 唤醒所有阻塞的 Get

    // 等待 processing 清空
    for q.processing.Len() != 0 && q.drain {
        q.cond.Wait()
        // 每个 Done 检查 processing.Len()==0 时会 Signal
        // 或者 ShutDown 被再次调用(drain=false)→ 也会退出
    }
}

关闭流程
后台 goroutine Worker 协程 TypedT 调用方 后台 goroutine Worker 协程 TypedT 调用方 #mermaid-svg-0J9sGBoa52lI7UxC{font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-0J9sGBoa52lI7UxC .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-0J9sGBoa52lI7UxC .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-0J9sGBoa52lI7UxC .error-icon{fill:#552222;}#mermaid-svg-0J9sGBoa52lI7UxC .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-0J9sGBoa52lI7UxC .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-0J9sGBoa52lI7UxC .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-0J9sGBoa52lI7UxC .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-0J9sGBoa52lI7UxC .edge-thickness-invisible{stroke-width:0;fill:none;}#mermaid-svg-0J9sGBoa52lI7UxC .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-0J9sGBoa52lI7UxC .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-0J9sGBoa52lI7UxC .marker{fill:#333333;stroke:#333333;}#mermaid-svg-0J9sGBoa52lI7UxC .marker.cross{stroke:#333333;}#mermaid-svg-0J9sGBoa52lI7UxC svg{font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-0J9sGBoa52lI7UxC p{margin:0;}#mermaid-svg-0J9sGBoa52lI7UxC .actor{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-0J9sGBoa52lI7UxC text.actor>tspan{fill:black;stroke:none;}#mermaid-svg-0J9sGBoa52lI7UxC .actor-line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);}#mermaid-svg-0J9sGBoa52lI7UxC .innerArc{stroke-width:1.5;stroke-dasharray:none;}#mermaid-svg-0J9sGBoa52lI7UxC .messageLine0{stroke-width:1.5;stroke-dasharray:none;stroke:#333;}#mermaid-svg-0J9sGBoa52lI7UxC .messageLine1{stroke-width:1.5;stroke-dasharray:2,2;stroke:#333;}#mermaid-svg-0J9sGBoa52lI7UxC #arrowhead path{fill:#333;stroke:#333;}#mermaid-svg-0J9sGBoa52lI7UxC .sequenceNumber{fill:white;}#mermaid-svg-0J9sGBoa52lI7UxC #sequencenumber{fill:#333;}#mermaid-svg-0J9sGBoa52lI7UxC #crosshead path{fill:#333;stroke:#333;}#mermaid-svg-0J9sGBoa52lI7UxC .messageText{fill:#333;stroke:none;}#mermaid-svg-0J9sGBoa52lI7UxC .labelBox{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-0J9sGBoa52lI7UxC .labelText,#mermaid-svg-0J9sGBoa52lI7UxC .labelText>tspan{fill:black;stroke:none;}#mermaid-svg-0J9sGBoa52lI7UxC .loopText,#mermaid-svg-0J9sGBoa52lI7UxC .loopText>tspan{fill:black;stroke:none;}#mermaid-svg-0J9sGBoa52lI7UxC .loopLine{stroke-width:2px;stroke-dasharray:2,2;stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);}#mermaid-svg-0J9sGBoa52lI7UxC .note{stroke:#aaaa33;fill:#fff5ad;}#mermaid-svg-0J9sGBoa52lI7UxC .noteText,#mermaid-svg-0J9sGBoa52lI7UxC .noteText>tspan{fill:black;stroke:none;}#mermaid-svg-0J9sGBoa52lI7UxC .activation0{fill:#f4f4f4;stroke:#666;}#mermaid-svg-0J9sGBoa52lI7UxC .activation1{fill:#f4f4f4;stroke:#666;}#mermaid-svg-0J9sGBoa52lI7UxC .activation2{fill:#f4f4f4;stroke:#666;}#mermaid-svg-0J9sGBoa52lI7UxC .actorPopupMenu{position:absolute;}#mermaid-svg-0J9sGBoa52lI7UxC .actorPopupMenuPanel{position:absolute;fill:#ECECFF;box-shadow:0px 8px 16px 0px rgba(0,0,0,0.2);filter:drop-shadow(3px 5px 2px rgb(0 0 0 / 0.4));}#mermaid-svg-0J9sGBoa52lI7UxC .actor-man line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-0J9sGBoa52lI7UxC .actor-man circle,#mermaid-svg-0J9sGBoa52lI7UxC line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;stroke-width:2px;}#mermaid-svg-0J9sGBoa52lI7UxC :root{--mermaid-font-family:"trebuchet ms",verdana,arial,sans-serif;} Get() 发现 shuttingDown+queue为空 → 返回 shutdown=true loop等待 processing 清空 processing 清空 → 退出 for 循环 ShutDownWithDrain()shuttingDown=true, drain=truecond.Broadcast()Done(item)processing.Delete(item)processing.Len()==0? → Signalclose(stopCh)wg.Wait()返回

3.5 updateUnfinishedWorkLoop --- 后台指标更新

go 复制代码
func (q *Typed[T]) updateUnfinishedWorkLoop() {
    t := q.clock.NewTicker(q.unfinishedWorkUpdatePeriod)
    // 默认 500ms 刷新一次
    defer t.Stop()

    for {
        select {
        case <-t.C():
            q.updateUnfinishedWork()
            // 更新 unfinishedWorkSeconds + longestRunningProcessor
        case <-q.stopCh:
            return
            // 队列关闭 → 退出
        }
    }
}

3.6 构造函数体系

go 复制代码
func newQueueWithConfig[T comparable](config TypedQueueConfig[T], updatePeriod time.Duration) *Typed[T] {
    metricsProvider := globalMetricsProvider
    if config.MetricsProvider != nil {
        metricsProvider = config.MetricsProvider
    }
    if config.Clock == nil {
        config.Clock = clock.RealClock{}
    }
    if config.Queue == nil {
        config.Queue = DefaultQueue[T]()  // 默认 slice FIFO
    }

    return newQueue(
        config.Clock,
        config.Queue,
        newQueueMetrics[T](metricsProvider, config.Name, config.Clock),
        updatePeriod,
    )
}

func newQueue[T comparable](c clock.WithTicker, queue Queue[T], metrics queueMetrics[T], updatePeriod time.Duration) *Typed[T] {
    t := &Typed[T]{
        clock:                      c,
        queue:                      queue,
        dirty:                      sets.Set[T]{},
        processing:                 sets.Set[T]{},
        cond:                       sync.NewCond(&sync.Mutex{}),
        metrics:                    metrics,
        unfinishedWorkUpdatePeriod: updatePeriod,
        stopCh:                     make(chan struct{}),
    }

    // 如果有 metrics → 启动后台 goroutine
    if _, ok := metrics.(noMetrics[T]); !ok {
        t.wg.Go(t.updateUnfinishedWorkLoop)
    }

    return t
}

四、核心业务逻辑深度解析 --- 延迟队列 (delaying_queue.go)

4.1 AddAfter --- 延迟入队

go 复制代码
func (q *delayingType[T]) AddAfter(item T, duration time.Duration) {
    // ─── 步骤1: 关闭检查 ───
    if q.ShuttingDown() {
        return
        // 队列关闭 → 忽略
    }

    // ─── 步骤2: 指标 ───
    q.metrics.retry()
    // 每次调用 AddAfter 都计为一次 retry

    // ─── 步骤3: 零延迟直接入队 ───
    if duration <= 0 {
        q.Add(item)
        return
        // 无需延迟 → 走基础队列的 Add
    }

    // ─── 步骤4: 发送到 waitingForAddCh ───
    select {
    case <-q.stopCh:
        // 队列关闭 → 不入队
    case q.waitingForAddCh <- &waitFor[T]{
        data:    item,
        readyAt: q.clock.Now().Add(duration),
        // readyAt = 当前时间 + 延迟时间
    }:
        // 成功写入缓冲通道
        // waitingLoop 会消费这个通道
    }
}

4.2 waitingLoop --- 延迟调度核心

go 复制代码
func (q *delayingType[T]) waitingLoop(logger klog.Logger) {
    defer utilruntime.HandleCrashWithLogger(logger)
    // panic 恢复

    // ─── 初始化 ───
    never := make(<-chan time.Time)
    // 永远不会触发的 channel,当堆为空时使用

    var nextReadyAtTimer clock.Timer
    // 下一个到期定时器

    waitingForQueue := &waitForPriorityQueue[T]{}
    heap.Init(waitingForQueue)
    // 最小堆,按 readyAt 排序

    waitingEntryByData := map[T]*waitFor[T]{}
    // 按 data 去重的索引,支持更新 readyAt

    // ─── 主循环 ───
    for {
        // 关闭检查
        if q.TypedInterface.ShuttingDown() {
            return
        }

        now := q.clock.Now()

        // ─── 处理已到期的条目 ───
        for waitingForQueue.Len() > 0 {
            entry := waitingForQueue.Peek().(*waitFor[T])
            if entry.readyAt.After(now) {
                break
                // 堆顶未到期 → 跳出
            }
            entry = heap.Pop(waitingForQueue).(*waitFor[T])
            q.Add(entry.data)
            // 到期 → 直接 Add 到基础队列
            delete(waitingEntryByData, entry.data)
            // 从去重索引删除
        }

        // ─── 设置下一个定时器 ───
        nextReadyAt := never
        if waitingForQueue.Len() > 0 {
            if nextReadyAtTimer != nil {
                nextReadyAtTimer.Stop()
                // 停止旧的定时器
            }
            entry := waitingForQueue.Peek().(*waitFor[T])
            nextReadyAtTimer = q.clock.NewTimer(entry.readyAt.Sub(now))
            nextReadyAt = nextReadyAtTimer.C()
            // 堆顶条目的剩余时间
        }

        // ─── 多路复用等待 ───
        select {
        case <-q.stopCh:
            return
            // 关闭信号 → 退出

        case <-q.heartbeat.C():
            // 心跳(10s),保险机制
            // 即使定时器出问题,最多延迟 10s
            // continue → 重新检查堆顶

        case <-nextReadyAt:
            // 堆顶条目到期
            // continue → 重新检查堆顶并处理

        case waitEntry := <-q.waitingForAddCh:
            // 接收到新的延迟条目
            if waitEntry.readyAt.After(q.clock.Now()) {
                insert(waitingForQueue, waitingEntryByData, waitEntry)
                // 未到期 → 插入堆
            } else {
                q.Add(waitEntry.data)
                // 已到期 → 直接 Add
            }

            // 尽量排空通道(非阻塞)
            drained := false
            for !drained {
                select {
                case waitEntry := <-q.waitingForAddCh:
                    if waitEntry.readyAt.After(q.clock.Now()) {
                        insert(waitingForQueue, waitingEntryByData, waitEntry)
                    } else {
                        q.Add(waitEntry.data)
                    }
                default:
                    drained = true
                }
            }
        }
    }
}

waitingLoop 完整流程
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No
Yes
No
waitingLoop 启动
初始化:

waitingForQueue (最小堆)

waitingEntryByData (去重 map)
主循环
ShuttingDown?
弹出已到期条目

heap.Pop → Add(data)
设置 nextReadyAtTimer

= 堆顶 readyAt - now
select 等待
<-stopCh → return
<-heartbeat → continue
<-nextReadyAt → continue
<-waitingForAddCh
readyAt > now?
insert() 堆插入/更新
Add(data) 直接入队
排空 waitingForAddCh

4.3 insert --- 堆插入/更新

go 复制代码
func insert[T comparable](q *waitForPriorityQueue[T], knownEntries map[T]*waitFor[T], entry *waitFor[T]) {
    // ─── 去重:如果 item 已在堆中 ───
    existing, exists := knownEntries[entry.data]
    if exists {
        if existing.readyAt.After(entry.readyAt) {
            // 新的 readyAt 更早 → 更新
            existing.readyAt = entry.readyAt
            heap.Fix(q, existing.index)
            // 重新调整堆,O(log n)
        }
        // 新的 readyAt 更晚或相等 → 忽略
        return
    }

    // ─── 新条目:插入堆 ───
    heap.Push(q, entry)
    knownEntries[entry.data] = entry
}

insert 的设计:保证同一 item 在堆中只有一份,且保留最早的 readyAt。这避免了同一 item 的重复延迟入队。

4.4 优先堆实现 --- waitForPriorityQueue

go 复制代码
type waitForPriorityQueue[T any] []*waitFor[T]

func (pq waitForPriorityQueue[T]) Len() int { return len(pq) }

func (pq waitForPriorityQueue[T]) Less(i, j int) bool {
    return pq[i].readyAt.Before(pq[j].readyAt)
    // 最小堆:readyAt 最早的在堆顶
}

func (pq waitForPriorityQueue[T]) Swap(i, j int) {
    pq[i], pq[j] = pq[j], pq[i]
    pq[i].index = i          // 更新索引,供 heap.Fix 使用
    pq[j].index = j
}

func (pq *waitForPriorityQueue[T]) Push(x interface{}) {
    n := len(*pq)
    item := x.(*waitFor[T])
    item.index = n
    *pq = append(*pq, item)
}

func (pq *waitForPriorityQueue[T]) Pop() interface{} {
    n := len(*pq)
    item := (*pq)[n-1]
    item.index = -1          // 标记为已移除
    *pq = (*pq)[0 : n-1]
    return item
}

func (pq waitForPriorityQueue[T]) Peek() interface{} {
    return pq[0]             // 查看堆顶,不移除
}
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