Golang：存储/缓存在以下http请求中提供的值

Question

I am writing some Go webservices (also implementing the webserver in Go with http.ListenAndServe). I have a map of structs which I would like to keep in memory (with an approximate data size of 100Kb) to be used by different http requests.

Which is the best way to achieve this in Go? In your experience, is it better to use global package variables or caching systems (like memcache/groupcache)?

Answer 1

Don't indulge in premature optimization. Define a Go package API to encapsulate the data and then you can change the implementation at any time. For example, just scribbling,

package data

type Key struct {
    // . . .
}

type Data struct {
    // . . .
}

var dataMap map[Key]Data

func init() {
    dataMap = make(map[Key]Data)
}

func GetData(key Key) (*Data, error) {
    data := dataMap[key]
    return &data, nil
}