Storable -> Object

object.go

@@ -0,0 +1,18 @@
+package main
+
+import "fmt"
+
+type Object interface {
+  GetType() string
+  GetId() string
+}
+
+func ObjectKey(obj Object) string {
+  return fmt.Sprintf(
+    "%d:%s:%d:%s",
+    len(obj.GetType()),
+    obj.GetType(),
+    len(obj.GetId()),
+    obj.GetId(),
+  )
+}