Value (Config) in Go

Posted by GoDoc
Public (Editable by Users)

The following example shows how to use Value for periodic program config updates and propagation of the changes to worker goroutines.

Go
Edit 
package main

import (
	"sync/atomic"
	"time"
)

func main() {
	var config atomic.Value // holds current server configuration
	// Create initial config value and store into config.
	config.Store(loadConfig())
	go func() {
		// Reload config every 10 seconds
		// and update config value with the new version.
		for {
			time.Sleep(10 * time.Second)
			config.Store(loadConfig())
		}
	}()
	// Create worker goroutines that handle incoming requests
	// using the latest config value.
	for i := 0; i < 10; i++ {
		go func() {
			for r := range requests() {
				c := config.Load()
				// Handle request r using config c.
				_, _ = r, c
			}
		}()
	}
}