Add an ObjectManager instance at / for both system and session bus connections.

internal/platform/implementation/linux/dbus.cc

@@ -13,8 +13,8 @@
 // limitations under the License.
 
 #include <cassert>
-#include <memory>
 #include <cstdlib>
+#include <memory>
 
 #include <sdbus-c++/IConnection.h>
 
@@ -27,9 +27,13 @@ static std::unique_ptr<sdbus::IConnection> global_system_bus_connection =
     nullptr;
 static std::unique_ptr<sdbus::IConnection> global_default_bus_connection =
     nullptr;
+static std::unique_ptr<RootObjectManager> system_root_object_manager = nullptr;
+static std::unique_ptr<RootObjectManager> default_root_object_manager = nullptr;
 static absl::once_flag bus_connection_init_;
 
 static void disconnectBus() {
+  system_root_object_manager = nullptr;
+  default_root_object_manager = nullptr;
   global_system_bus_connection = nullptr;
   global_default_bus_connection = nullptr;
 }
@@ -39,6 +43,11 @@ static void initBusConnections() {
   global_system_bus_connection->enterEventLoopAsync();
   global_default_bus_connection = sdbus::createDefaultBusConnection();
   global_default_bus_connection->enterEventLoopAsync();
+  system_root_object_manager =
+      std::make_unique<RootObjectManager>(*global_system_bus_connection);
+  default_root_object_manager =
+      std::make_unique<RootObjectManager>(*global_default_bus_connection);
+
   atexit(disconnectBus);
 }
 

internal/platform/implementation/linux/dbus.h

@@ -15,7 +15,9 @@
 #ifndef PLATFORM_IMPL_LINUX_DBUS_H_
 #define PLATFORM_IMPL_LINUX_DBUS_H_
 
+#include <sdbus-c++/AdaptorInterfaces.h>
 #include <sdbus-c++/IConnection.h>
+#include <sdbus-c++/StandardInterfaces.h>
 #include "internal/platform/logging.h"
 
 #define DBUS_LOG_METHOD_CALL_ERROR(p, m, e)                            \
@@ -46,6 +48,17 @@ namespace nearby {
 namespace linux {
 extern sdbus::IConnection &getSystemBusConnection();
 extern sdbus::IConnection &getDefaultBusConnection();
+class RootObjectManager final
+    : public sdbus::AdaptorInterfaces<sdbus::ObjectManager_adaptor,
+                                      sdbus::Properties_adaptor> {
+ public:
+  explicit RootObjectManager(sdbus::IConnection &system_bus)
+      : AdaptorInterfaces(system_bus, "/") {
+    registerAdaptor();
+  }
+  ~RootObjectManager() { unregisterAdaptor(); }
+};
+
 }  // namespace linux
 }  // namespace nearby
 #endif