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factory.go
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factory.go
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package kvdb
import (
"errors"
"fmt"
"sort"
"sync"
)
// Factory keyvalue database driver create factory.
type Factory func(loader func(v interface{}) error) (Driver, error)
var (
factorysMu sync.RWMutex
factories = make(map[string]Factory)
)
// Register makes a driver creator available by the provided name.
// If Register is called twice with the same name or if driver is nil,
// it panics.
func Register(name string, f Factory) {
factorysMu.Lock()
defer factorysMu.Unlock()
if f == nil {
panic(errors.New("kvdb: Register kvdb factory is nil"))
}
if _, dup := factories[name]; dup {
panic(errors.New("kvdb: Register called twice for factory " + name))
}
factories[name] = f
}
//UnregisterAll unregister all driver
func UnregisterAll() {
factorysMu.Lock()
defer factorysMu.Unlock()
// For tests.
factories = make(map[string]Factory)
}
//Factories returns a sorted list of the names of the registered factories.
func Factories() []string {
factorysMu.RLock()
defer factorysMu.RUnlock()
var list []string
for name := range factories {
list = append(list, name)
}
sort.Strings(list)
return list
}
//NewDriver create new driver with given name loader.
//Reutrn driver created and any error if raised.
func NewDriver(name string, loader func(v interface{}) error) (Driver, error) {
factorysMu.RLock()
factoryi, ok := factories[name]
factorysMu.RUnlock()
if !ok {
return nil, fmt.Errorf("kvdb: unknown driver %q (forgotten import?)", name)
}
return factoryi(loader)
}