Golang开发：构建高效的任务调度器

package main

import (
    "fmt"
    "time"
)

func main() {
    ticker := time.NewTicker(1 * time.Second)
    go func() {
        for range ticker.C {
            fmt.Println("执行定时任务")
        }
    }()

    time.Sleep(5 * time.Second)
    ticker.Stop()
    fmt.Println("任务调度器停止")
}

type Task struct {
    ExecTime time.Time     // 执行时间
    Handler  func() error // 任务处理函数
}

package main

import (
    "container/heap"
    "fmt"
    "time"
)

type Task struct {
    ExecTime time.Time
    Handler  func() error
}

type TaskHeap []Task

func (h TaskHeap) Len() int            { return len(h) }
func (h TaskHeap) Less(i, j int) bool  { return h[i].ExecTime.Before(h[j].ExecTime) }
func (h TaskHeap) Swap(i, j int)       { h[i], h[j] = h[j], h[i] }
func (h *TaskHeap) Push(x interface{}) { *h = append(*h, x.(Task)) }
func (h *TaskHeap) Pop() interface{} {
    old := *h
    n := len(old)
    task := old[n-1]
    *h = old[0 : n-1]
    return task
}

func main() {
    taskHeap := &TaskHeap{}
    heap.Init(taskHeap)

    tasks := []Task{
        {ExecTime: time.Now().Add(5 * time.Second), Handler: func() error {
            fmt.Println("执行任务1")
            return nil
        }},
        {ExecTime: time.Now().Add(3 * time.Second), Handler: func() error {
            fmt.Println("执行任务2")
            return nil
        }},
        {ExecTime: time.Now().Add(1 * time.Second), Handler: func() error {
            fmt.Println("执行任务3")
            return nil
        }},
    }

    for _, task := range tasks {
        heap.Push(taskHeap, task)
    }

    for taskHeap.Len() > 0 {
        now := time.Now()
        task := heap.Pop(taskHeap).(Task)
        if task.ExecTime.After(now) {
            time.Sleep(task.ExecTime.Sub(now))
        }
        
        task.Handler()
    }
}