awesome-patterns/creational/factory_method.go

package data

import "io"

type Store interface {
    Open(string) (io.ReadWriteCloser, error)
}


type StorageType int

const (
    DiskStorage StorageType = 1 << iota
    TempStorage
    MemoryStorage
)

func NewStore(t StorageType) Store {
    switch t {
    case MemoryStorage:
        return newMemoryStorage( /*...*/ )
    case DiskStorage:
        return newDiskStorage( /*...*/ )
    default:
        return newTempStorage( /*...*/ )
    }
}

s, _ := NewStore(data.MemoryStorage)
f, _ := s.Open("file")

n, _ := f.Write([]byte("data"))
defer f.Close()