memctag

About

This is a memcached client library which can set tag(s) and delete by tag

Installing

Using go get

$ go get github.com/dakimura/memctag/memcache

Usage

package main

import (
    "fmt"
    "github.com/bradfitz/gomemcache/memcache"
    memcacheWithTag "github.com/dakimura/memctag/memcache"
)


func main(){
    // initialize memcached client
    mc := memcacheWithTag.NewClient("127.0.0.1:11211")

    tags := []string{"1-tag", "2-tag"}
    tag := []string{"1-tag"}

    item := memcache.Item{Key: "1:message", Value: []byte("cache1")}
    item2 := memcache.Item{Key: "2:message", Value: []byte("cache2")}
    item3 := memcache.Item{Key: "3:message", Value: []byte("cache3")}

    // set cache with tag(s)
    mc.SetWithTags(&item, tags)
    mc.SetWithTags(&item2, tags)
    mc.SetWithTags(&item3, tag)

    printCache(mc.GetWithTags("1:message", tags)) //"1-tag", "2-tag"
    printCache(mc.GetWithTags("2:message", tags)) //"1-tag", "2-tag"
    printCache(mc.GetWithTags("3:message", tag))  //"1-tag"

    // you can delete all caches which have been set with the tag
    mc.Delete("2-tag")

    printCache(mc.GetWithTags("1:message", tags)) // -> cache miss
    printCache(mc.GetWithTags("2:message", tags)) // -> cache miss
    printCache(mc.GetWithTags("3:message", tag))  // -> "cache3"

    // also you can delete it by the cache key
    mc.Delete("3:message")
    printCache(mc.GetWithTags("3:message", tag))

}

func printCache(item *memcache.Item, err error) {
    if err != nil {
        fmt.Println(err.Error())
    } else {
        fmt.Println(string(item.Value))
    }
}

gomemcache functionalities

This library is a wrapper of gomemcache. You can use all functionalities in gomemcache.

See https://godoc.org/github.com/bradfitz/gomemcache/memcache