apps: added the application_unit interface

Author: AlaiaL

apps/CMakeLists.txt

@@ -8,5 +8,5 @@
 
 add_subdirectory(examples)
 add_subdirectory(gnb)
-add_subdirectory(modules)
+add_subdirectory(units)
 add_subdirectory(services)

apps/gnb/gnb.cpp

@@ -44,7 +44,7 @@
 #include "apps/services/metrics_hub.h"
 #include "apps/services/rlc_metrics_plotter_json.h"
 
-#include "apps/modules/flexible_du/split_ru_dynamic/dynamic_du_factory.h"
+#include "apps/units/flexible_du/split_ru_dynamic/dynamic_du_factory.h"
 #include "srsran/phy/upper/upper_phy_timing_notifier.h"
 
 #include "srsran/ru/ru_adapters.h"
@@ -59,12 +59,12 @@
 
 #include <atomic>
 
-#include "../modules/cu_cp/logger_registrator.h"
-#include "../modules/cu_cp/pcap_factory.h"
-#include "../modules/cu_up/logger_registrator.h"
-#include "../modules/cu_up/pcap_factory.h"
-#include "../modules/flexible_du/du_high/pcap_factory.h"
-#include "../modules/flexible_du/split_ru_dynamic/logger_registrator.h"
+#include "../units/cu_cp/logger_registrator.h"
+#include "../units/cu_cp/pcap_factory.h"
+#include "../units/cu_up/logger_registrator.h"
+#include "../units/cu_up/pcap_factory.h"
+#include "../units/flexible_du/du_high/pcap_factory.h"
+#include "../units/flexible_du/split_ru_dynamic/logger_registrator.h"
 
 #ifdef DPDK_FOUND
 #include "srsran/hal/dpdk/dpdk_eal_factory.h"

apps/modules/CMakeLists.txt renamed to apps/units/CMakeLists.txt

@@ -0,0 +1,39 @@
+/*
+ *
+ * Copyright 2021-2024 Software Radio Systems Limited
+ *
+ * By using this file, you agree to the terms and conditions set
+ * forth in the LICENSE file which can be found at the top level of
+ * the distribution.
+ *
+ */
+
+#pragma once
+
+namespace CLI {
+class App;
+} // namespace CLI
+
+namespace srsran {
+
+/// \brief Application unit interface.
+///
+/// An application unit object is the most basic building block used by an application. Possible implementations of this
+/// object can be a CU or DU. The application must register the unit capabilities in its services, so it can use them.
+/// An application is composed of 1 or more units.
+class application_unit
+{
+public:
+  virtual ~application_unit() = default;
+
+  /// Registers the parsing configuration properties that will be used by this application unit.
+  virtual void on_parsing_configuration_registration(CLI::App& app) = 0;
+
+  /// Validates the configuration of this application unit. Returns true on success, otherwise false.
+  virtual bool on_configuration_validation() const = 0;
+
+  /// Registers the loggers of this application unit.
+  virtual void on_loggers_registration() = 0;
+};
+
+} // namespace srsran