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Go 言語を学ぶAdvent Calendar 2023

Day 11

シンプルなインメモリキャッシュ go-cache

Posted at

go-cache

キャッシュというと、Redisやmemcachedなどが有名所ですが、Goではインメモリなキャッシュを扱うことができます。アイテムごとにTTLを設定でき、取り扱いがシンプルなgo-cacheを紹介します。

インストール

go get github.com/patrickmn/go-cache
main.go
package main

import (
	"fmt"
	"time"

	"github.com/patrickmn/go-cache"
)

func main() {
    // TTL設定
    c := cache.New(30*time.Second, 2*time.Minute)
    c.Set("key", "value", cache.DefaultExpiration)

    val, found := c.Get("key")
    if found {
        fmt.Println("Found key:", val)
    } else {
        fmt.Println("key not found")
    }
    // 揮発しているか確認
	time.Sleep(1 * time.Minute)
	fmt.Println("1分経過")
	_, found = c.Get("key")
	if found {
		fmt.Println("Found key:", val)
	} else {
		fmt.Println("key not found")
	}
}

実行してみます。

go run main.go
Found key: value
1分経過
key not found
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