01_cache_log_buffer.go

package main

import (
	"fmt"
	"sync"
	"time"
)

var logBufferPool = sync.Pool{
	New: func() interface{} {
		return new([]byte)
	},
}

func logMessage(msg string) {
	buf := logBufferPool.Get().(*[]byte)
	defer logBufferPool.Put(buf)

	*buf = (*buf)[:0]

	*buf = append(*buf, []byte(time.Now().Format(time.DateTime))...)
	*buf = append(*buf, " - "...)
	*buf = append(*buf, msg...)

	fmt.Println(string(*buf))
}