fix: change order on starting olink service

Adds information that server should be started when all services are
added to registry.
Changes order of starting a server in examples.
If client wants to make a connection before the server is up, the olink
client will reconnect until it will succeed. On server start, connection
gets established, but if a services is not already to service, the Olink
will fail to link service side with a client side. To avoid such
sitiation the services should be added to registry befor server starts
listening.

Author: dorotaphanSiili

docs/docs/features/olink.md

@@ -184,13 +184,15 @@ As mentioned earlier you need a network layer, here provided by a `ApiGear::Obje
     // Prepare the registry, the server, and an object which you want to expose.
     ApiGear::ObjectLink::RemoteRegistry registry;
     ApiGear::ObjectLink::OLinkHost server(registry);
-    server.listen("localhost", 8182);
     auto ioWorldHello = std::make_shared<io_world::Hello>();
 
     // Create your OLinkHelloAdapter and add it to registry.
     auto ioWorldOlinkHelloService = std::make_shared<io_world::OLinkHelloAdapter>(registry, ioWorldHello.get());
     registry.addSource(ioWorldOlinkHelloService);
 
+    // Start server with source added to registry.
+    server.listen("localhost", 8182);
+
     // use your ioWorldHello implementation, all property changes, and signals will be passed to connected OLink clients.
     auto lastMessage = ioWorldHello->last();
     ioWorldHello->say(lastMessage, io_world::When::Soon);

goldenmaster/examples/olinkserver/main.cpp

@@ -87,7 +87,6 @@ int main(int argc, char *argv[]){
 
     QCoreApplication app(argc, argv);  ApiGear::ObjectLink::RemoteRegistry registry;
     ApiGear::ObjectLink::OLinkHost server(registry);
-    server.listen("localhost", 8182);
     auto testbed2ManyParamInterface = std::make_shared<testbed2::ManyParamInterface>();
     testbed2::ManyParamInterfaceTraced testbed2ManyParamInterfaceTraced(testbed2ManyParamInterface );
     auto testbed2OlinkManyParamInterfaceService = std::make_shared<testbed2::OLinkManyParamInterfaceAdapter>(registry, &testbed2ManyParamInterfaceTraced);
@@ -180,6 +179,10 @@ int main(int argc, char *argv[]){
     counter::CounterTraced counterCounterTraced(counterCounter );
     auto counterOlinkCounterService = std::make_shared<counter::OLinkCounterAdapter>(registry, &counterCounterTraced);
     registry.addSource(counterOlinkCounterService);
+    
+    // Start your server after all the services are added.
+    // This way you are sure that any new client that connects, will find the source it needs.
+    server.listen("localhost", 8182);
 
     auto result = app.exec();
     // Use the server.

templates/examples/olinkserver/main.cpp.tpl

@@ -29,7 +29,6 @@ int main(int argc, char *argv[]){
 
     QCoreApplication app(argc, argv);  ApiGear::ObjectLink::RemoteRegistry registry;
     ApiGear::ObjectLink::OLinkHost server(registry);
-    server.listen("localhost", 8182);
 
     {{- range.System.Modules }}
     {{- $module := . }}
@@ -50,6 +49,10 @@ int main(int argc, char *argv[]){
     registry.addSource( {{- $serviceInstanceName }});
     {{- end }}
     {{- end }}
+    
+    // Start your server after all the services are added.
+    // This way you are sure that any new client that connects, will find the source it needs.
+    server.listen("localhost", 8182);
 
     auto result = app.exec();
     // Use the server.