Add condition to Update AMF conf

src/amf-app/amf_app.cpp

@@ -778,9 +778,26 @@ bool amf_app::read_amf_configuration(nlohmann::json& json_data) {
 
 //---------------------------------------------------------------------------------------------
 bool amf_app::update_amf_configuration(nlohmann::json& json_data) {
+  if (get_number_registered_ues() > 0) {
+    Logger::amf_app().info(
+        "AMF is actively handling UEs, could not update AMF configuration");
+    return false;
+  }
   return amf_cfg.from_json(json_data);
 }
 
+//---------------------------------------------------------------------------------------------
+void amf_app::get_number_registered_ues(uint32_t& num_ues) const {
+  std::shared_lock lock(m_amf_ue_ngap_id2ue_ctx);
+  num_ues = amf_ue_ngap_id2ue_ctx.size();
+  return;
+}
+
+//---------------------------------------------------------------------------------------------
+uint32_t amf_app::get_number_registered_ues() const {
+  std::shared_lock lock(m_amf_ue_ngap_id2ue_ctx);
+  return amf_ue_ngap_id2ue_ctx.size();
+}
 //---------------------------------------------------------------------------------------------
 void amf_app::add_n1n2_message_subscription(
     const std::string& ue_ctx_id, const n1n2sub_id_t& sub_id,

src/amf-app/amf_app.hpp

@@ -166,9 +166,34 @@ class amf_app {
    */
   void handle_itti_message(itti_sbi_update_amf_configuration& itti_msg);
 
+  /*
+   * Get the current AMF's configuration
+   * @param [nlohmann::json&]: json_data: Store AMF configuration
+   * @return true if success, otherwise return false
+   */
   bool read_amf_configuration(nlohmann::json& json_data);
+
+  /*
+   * Update AMF configuration
+   * @param [nlohmann::json&]: json_data: New AMF configuration
+   * @return true if success, otherwise return false
+   */
   bool update_amf_configuration(nlohmann::json& json_data);
 
+  /*
+   * Get number of registered UEs to this AMF
+   * @param [uint32_t&]: num_ues: Store the number of registered UEs
+   * @return void
+   */
+  void get_number_registered_ues(uint32_t& num_ues) const;
+
+  /*
+   * Get number of registered UEs to this AMF
+   * @param void
+   * @return: number of registered UEs
+   */
+  uint32_t get_number_registered_ues() const;
+
   /*
    * Verify if a UE context associated with an AMF UE NGAP ID exist
    * @param [const long&] amf_ue_ngap_id: AMF UE NGAP ID

src/amf-app/amf_config.cpp

@@ -1017,6 +1017,7 @@ void amf_config::to_json(nlohmann::json& json_data) const {
   }
 }
 
+//------------------------------------------------------------------------------
 bool amf_config::from_json(nlohmann::json& json_data) {
   try {
     if (json_data.find("instance") != json_data.end()) {