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driver.go
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driver.go
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package opt
import (
"sort"
"sync"
)
var (
driversMu sync.RWMutex
drivers = make(map[string]Driver)
)
// Marks source changed event
const (
SourceRemoved = iota
SourceModified
)
// SourceChangedFunc defines handler for source change
type SourceChangedFunc func(f int) error
// Driver is reponsible for loading/saving configuration
type Driver interface {
Connect(h func(f int) error, prop *Options) (Connector, error)
}
// Connector connects to configuration source
type Connector interface {
Load() (*Options, error)
Store(v *Options) error
Close() error
}
// Register makes a driver 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, driver Driver) {
driversMu.Lock()
defer driversMu.Unlock()
if driver == nil {
panic("alert: Register driver is nil")
}
if _, dup := drivers[name]; dup {
panic("alert: Register called twice for driver " + name)
}
drivers[name] = driver
}
func unregisterAllDrivers() {
driversMu.Lock()
defer driversMu.Unlock()
// For tests.
drivers = make(map[string]Driver)
}
// Drivers returns a sorted list of the names of the registered drivers.
func Drivers() []string {
driversMu.RLock()
defer driversMu.RUnlock()
var list []string
for name := range drivers {
list = append(list, name)
}
sort.Strings(list)
return list
}
// DriverFor return Driver for given name
func DriverFor(name string) Driver {
driversMu.RLock()
defer driversMu.RUnlock()
if driver, ok := drivers[name]; ok {
return driver
}
return nil
}