timer

Go implementation of Kafka's Hierarchical Timing Wheels.

Feature

• Unlimited hierarchical wheel.
• insert, delete, scan task almost O(1).
• Different from the time wheel of Linux, it has no maximum time limit.
• Support millions of tasks.
• timed is a global timer instance, that tick is 1ms. wheel size is 512, use ants goroutine pool.

Usage

Installation

Use go get.

    go get github.com/thinkgos/timer

Then import the package into your own code.

    import "github.com/thinkgos/timer"

Example

use global timer instance.

package main

import (
	"fmt"
	"sync"
	"time"

	"github.com/thinkgos/timer/timed"
)

func main() {
	var wg sync.WaitGroup
	for i := 0; i < 1000; i++ {
		wg.Add(1)
		index := i
		_, _ = timed.AfterFunc(time.Duration(i)*100*time.Millisecond, func() {
			fmt.Printf("%s: timer task %d is executed, remain task: %d\n", time.Now().String(), index, timed.TaskCounter())
			wg.Done()
		})
	}
	wg.Wait()
}

References

• kafka timing wheels

License

This project is under MIT License. See the LICENSE file for the full license text.