Implement IComponentHandler::restartComponent()

The base IComponentHandler is now fully implemented.

src/common/logging/vst3.cpp

@@ -471,6 +471,16 @@ bool Vst3Logger::log_request(bool is_host_vst,
     });
 }
 
+bool Vst3Logger::log_request(
+    bool is_host_vst,
+    const YaComponentHandler::RestartComponent& request) {
+    return log_request_base(is_host_vst, [&](auto& message) {
+        message << request.owner_instance_id
+                << ": IComponentHandler::restartComponent(flags = "
+                << request.flags << ")";
+    });
+}
+
 void Vst3Logger::log_response(bool is_host_vst, const Ack&) {
     log_response_base(is_host_vst, [&](auto& message) { message << "ACK"; });
 }

src/common/logging/vst3.h

@@ -113,6 +113,8 @@ class Vst3Logger {
     bool log_request(bool is_host_vst, const YaComponentHandler::BeginEdit&);
     bool log_request(bool is_host_vst, const YaComponentHandler::PerformEdit&);
     bool log_request(bool is_host_vst, const YaComponentHandler::EndEdit&);
+    bool log_request(bool is_host_vst,
+                     const YaComponentHandler::RestartComponent&);
 
     void log_response(bool is_host_vst, const Ack&);
     void log_response(

src/common/serialization/vst3.h

@@ -108,7 +108,8 @@ void serialize(S& s, ControlRequest& payload) {
 using CallbackRequest = std::variant<WantsConfiguration,
                                      YaComponentHandler::BeginEdit,
                                      YaComponentHandler::PerformEdit,
-                                     YaComponentHandler::EndEdit>;
+                                     YaComponentHandler::EndEdit,
+                                     YaComponentHandler::RestartComponent>;
 
 template <typename S>
 void serialize(S& s, CallbackRequest& payload) {

src/common/serialization/vst3/component-handler/component-handler.h

@@ -125,6 +125,26 @@ class YaComponentHandler : public Steinberg::Vst::IComponentHandler {
     };
 
     virtual tresult PLUGIN_API endEdit(Steinberg::Vst::ParamID id) override = 0;
+
+    /**
+     * Message to pass through a call to
+     * `IComponentHandler::restartComponent(flags)` to the component handler
+     * provided by the host.
+     */
+    struct RestartComponent {
+        using Response = UniversalTResult;
+
+        native_size_t owner_instance_id;
+
+        int32 flags;
+
+        template <typename S>
+        void serialize(S& s) {
+            s.value8b(owner_instance_id);
+            s.value4b(flags);
+        }
+    };
+
     virtual tresult PLUGIN_API restartComponent(int32 flags) override = 0;
 
    protected: