feat: allow developers to register external cpp plugins

core/application/Application.cpp

@@ -240,6 +240,10 @@ void Application::Start() { // GCOVR_EXCL_START
 
     // plugin registration
     PluginRegistry::GetInstance()->LoadPlugins();
+
+    // external plugin registration
+    RegisterExternalPlugins();
+
     InputFeedbackInterfaceRegistry::GetInstance()->LoadFeedbackInterfaces();
 
 #if defined(__ENTERPRISE__) && defined(__linux__) && !defined(__ANDROID__)

core/collection_pipeline/plugin/PluginRegistry.h

@@ -56,6 +56,10 @@ class PluginRegistry {
     bool IsValidNativeFlusherPlugin(const std::string& name) const;
     bool IsGlobalSingletonInputPlugin(const std::string& name) const;
 
+    void RegisterInputCreator(PluginCreator* creator, bool isSingleton = false);
+    void RegisterProcessorCreator(PluginCreator* creator);
+    void RegisterFlusherCreator(PluginCreator* creator, bool isSingleton = false);
+
 private:
     enum PluginCat { INPUT_PLUGIN, PROCESSOR_PLUGIN, FLUSHER_PLUGIN };
 
@@ -79,9 +83,6 @@ class PluginRegistry {
 
     void LoadStaticPlugins();
     void LoadDynamicPlugins(const std::set<std::string>& plugins);
-    void RegisterInputCreator(PluginCreator* creator, bool isSingleton = false);
-    void RegisterProcessorCreator(PluginCreator* creator);
-    void RegisterFlusherCreator(PluginCreator* creator, bool isSingleton = false);
     PluginCreator* LoadProcessorPlugin(DynamicLibLoader& loader, const std::string pluginType);
     void RegisterCreator(PluginCat cat, PluginCreator* creator, bool isSingleton);
     std::unique_ptr<PluginInstance>

core/provider/Provider.cpp

@@ -38,4 +38,8 @@ ProfileSender* GetProfileSender() {
     return ProfileSender::GetInstance();
 }
 
+
+void RegisterExternalPlugins() {
+}
+
 } // namespace logtail

core/provider/Provider.h

@@ -32,6 +32,13 @@ std::vector<ConfigProvider*> GetRemoteConfigProviders();
 // It currently initializes the LegacyCommonConfigProvider and CommonConfigProvider.
 void InitRemoteConfigProviders();
 
+// Deprecated:
 // GetProfileSender returns the ProfileSender instance.
+// Self-monitor is not sent via ProfileSender anymore.
 ProfileSender* GetProfileSender();
+
+// RegisterExternalPlugins registers the external cpp plugins.
+// For example:
+//  PluginRegistry::GetInstance()->RegisterFlusherCreator(new StaticFlusherCreator<FlusherExternal>());
+void RegisterExternalPlugins();
 } // namespace logtail