[#231] Support ChildTrace

Author: feelform

lib/context/trace/stack-id.js

@@ -0,0 +1,35 @@
+/**
+ * Pinpoint Node.js Agent
+ * Copyright 2020-present NAVER Corp.
+ * Apache License v2.0
+ */
+
+'use strict'
+
+class StackId {
+    /**
+     * A constant representing the ID for a null object stack.
+     * This is used to signify that the stack ID is invalid or not set.
+     * Only for Node.js Agent internal use.
+     * 
+     * @constant {number} -2
+     */
+    static nullObject = -2
+
+    /**
+     * The default stack ID used in the span event builder.
+     * This value is set to -1 by default.
+     * 
+     * @constant {number} -1
+     */
+    static default = -1
+
+    /**
+     * The root stack identifier.
+     * 
+     * @constant {number} 0
+     */
+    static root = 0
+}
+
+module.exports = StackId