fix change listener

start.go

@@ -1,6 +1,7 @@
 package agollo
 
 import (
+	"container/list"
 	"github.com/zouyx/agollo/v3/agcache"
 	_ "github.com/zouyx/agollo/v3/agcache/memory"
 	"github.com/zouyx/agollo/v3/cluster"
@@ -77,6 +78,21 @@ func SetCache(cacheFactory agcache.CacheFactory) {
 	}
 }
 
+//AddChangeListener 增加变更监控
+func AddChangeListener(listener storage.ChangeListener) {
+	storage.AddChangeListener(listener)
+}
+
+//RemoveChangeListener 增加变更监控
+func RemoveChangeListener(listener storage.ChangeListener) {
+	storage.AddChangeListener(listener)
+}
+
+//GetChangeListeners 获取配置修改监听器列表
+func GetChangeListeners() *list.List {
+	return storage.GetChangeListeners()
+}
+
 func startAgollo() error {
 	// 有了配置之后才能进行初始化
 	if err := env.InitConfig(initAppConfigFunc); err != nil {