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factory.go
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factory.go
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package dynamic_params
import (
"errors"
"fmt"
"github.com/eolinker/eosc/log"
"github.com/eolinker/eosc"
)
var (
ErrorInvalidBalance = errors.New("invalid balance")
defaultFactoryRegister = newFactoryManager()
)
// IFactoryRegister 实现了负载均衡算法工厂管理器
type IFactoryRegister interface {
RegisterFactoryByKey(key string, factory IDynamicFactory)
GetFactoryByKey(key string) (IDynamicFactory, bool)
Keys() []string
}
// driverRegister 实现了IBalanceFactoryRegister接口
type driverRegister struct {
register eosc.IRegister[IDynamicFactory]
keys []string
}
// newFactoryManager 创建负载均衡算法工厂管理器
func newFactoryManager() IFactoryRegister {
return &driverRegister{
register: eosc.NewRegister[IDynamicFactory](),
keys: make([]string, 0, 10),
}
}
// GetFactoryByKey 获取指定balance工厂
func (dm *driverRegister) GetFactoryByKey(key string) (IDynamicFactory, bool) {
o, has := dm.register.Get(key)
if has {
log.Debug("GetFactoryByKey:", key, ":has")
f, ok := o.(IDynamicFactory)
return f, ok
}
return nil, false
}
// RegisterFactoryByKey 注册balance工厂
func (dm *driverRegister) RegisterFactoryByKey(key string, factory IDynamicFactory) {
err := dm.register.Register(key, factory, true)
if err != nil {
log.Debug("RegisterFactoryByKey:", key, ":", err)
return
}
dm.keys = append(dm.keys, key)
}
// Keys 返回所有已注册的key
func (dm *driverRegister) Keys() []string {
return dm.keys
}
// Register 注册balance工厂到默认balanceFactory注册器
func Register(key string, factory IDynamicFactory) {
defaultFactoryRegister.RegisterFactoryByKey(key, factory)
}
// Get 从默认balanceFactory注册器中获取balance工厂
func Get(key string) (IDynamicFactory, bool) {
return defaultFactoryRegister.GetFactoryByKey(key)
}
// Keys 返回默认的balanceFactory注册器中所有已注册的key
func Keys() []string {
return defaultFactoryRegister.Keys()
}
// GetFactory 获取指定负载均衡算法工厂,若指定的不存在则返回一个已注册的工厂
func GetFactory(name string) (IDynamicFactory, error) {
factory, ok := Get(name)
if !ok {
for _, key := range Keys() {
factory, ok = Get(key)
if ok {
break
}
}
if factory == nil {
return nil, fmt.Errorf("%s:%w", name, ErrorInvalidBalance)
}
}
return factory, nil
}