fix: address code review issues

- read_csv.hpp: replace std::exit(1) with std::runtime_error throw
- read_csv.hpp: remove duplicate #pragma once
- RNG.cc: wrap JSON load in try-catch to prevent crash on missing config
- Generator.cc: fix comments to reflect actual 3-pass structure

TestProject/RNG/Generator.cc

@@ -38,7 +38,7 @@ bool Generator::wtite_in_shm(int event_no) {
         ((chrono::system_clock::now() - stime).count() / (size_t)pow(10, 6)) /
         20;
 
-    // First pass: create all models and link valve_pair models
+    // Pass 1: create model instances
     for (int i = 0; i < size; i++) {
       const char* spec = binary_tele[i].tables[1];
       string specStr = (spec != nullptr && strlen(spec) > 0) ? string(spec) : "";
@@ -46,6 +46,7 @@ bool Generator::wtite_in_shm(int event_no) {
       string key = string(binary_tele[i].item);
       registry.getOrCreate(specStr, defaultVal, key);
     }
+    // Pass 2: link valve_pair models to action signals
     for (int i = 0; i < size; i++) {
       const char* spec = binary_tele[i].tables[1];
       string specStr = (spec != nullptr && strlen(spec) > 0) ? string(spec) : "";
@@ -55,7 +56,7 @@ bool Generator::wtite_in_shm(int event_no) {
       model->linkPeers(registry);
     }
 
-    // Second pass: evaluate
+    // Pass 3: evaluate all models
     for (int i = 0; i < size; i++) {
       const char* spec = binary_tele[i].tables[1];
       string specStr = (spec != nullptr && strlen(spec) > 0) ? string(spec) : "";

TestProject/RNG/RNG.cc

@@ -17,7 +17,12 @@ int RNG::start() {
   logger_->Info() << "-------RNG::start-------" << std::endl;
   con_mag_ = std::make_shared<ConnectionMag>();
   con_mag_->dbLogin();
-  ModelRegistry::instance().loadModels("/users/dsc/code/TestProject/RNG/json/rng_models.json");
+  try {
+    ModelRegistry::instance().loadModels("/users/dsc/code/TestProject/RNG/json/rng_models.json");
+  } catch (const std::exception& e) {
+    logger_->Error() << "Failed to load rng_models.json: " << e.what() << endl;
+    return (-1);
+  }
   try {
     auto module_name = name();
     RNG_server = new RNGICEI();

TestProject/RNG/read_csv.hpp

@@ -1,8 +1,8 @@
 #pragma once
-#pragma once
 #include <fstream>
 #include <iostream>
 #include <sstream>
+#include <stdexcept>
 #include <string>
 #include <type_traits>
 #include <vector>
@@ -20,8 +20,7 @@ struct ReadCSV {
     string word;
     using std::is_same_v;
     if (!infile.is_open()) {
-      std::cout << "Error: opening file fail" << std::endl;
+      throw std::runtime_error("Cannot open CSV file: " + file_dir);
-      std::exit(1);
     }
     while (std::getline(infile, line)) {
       std::istringstream sin;