Added base of code to allow sending backend updates to connected clients.

src/GroovePlayer.cpp

@@ -22,6 +22,9 @@
 #include "db/AudioTrack.h"
 #include "db/UserAction.h"
 #include <Wt/WLogger>
+#include <Wt/WServer>
+#include <Wt/WApplication>
+#include "WebInterface.h"
 
 GroovePlayer::GroovePlayer(std::string dbFile) : sqliteConnection(dbFile)
 {
@@ -37,3 +40,14 @@ GroovePlayer::GroovePlayer(std::string dbFile) : sqliteConnection(dbFile)
         Wt::log("info") << "Using Existing DB.";
     }
 }
+
+    //TODO:use this code when sending to UI.
+//         Wt::WServer::instance()->postAll([]() {
+//             Wt::WApplication* app = Wt::WApplication::instance();
+//             if(app != nullptr)
+//             {
+//                 static_cast<WebInterface*>(app)->updateUIFromServer();
+//             }
+//         }
+//         );
+