diff --git a/pkg/lru/define.go b/pkg/lru/define.go
index 2e7653a..a2da432 100644
--- a/pkg/lru/define.go
+++ b/pkg/lru/define.go
@@ -1,10 +1,16 @@
 package lru
 
+import "sync"
+
 type SingleWorkFunc func() interface{}
 
 const (
 	OpEventName  = "operateEvent"
 	CleEventName = "clearEvent"
-
-	WorkFuncEventCtxKey = "workFunc"
+	WorkFuncEventKey = "workFunc"
+)
+
+var (
+	lruCacheOnce sync.Once
+	lruCache *singleCache
 )