--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Plugin/GoogleUpdater.h	Thu Jun 13 14:57:22 2019 +0200
@@ -0,0 +1,73 @@
+/**
+ * Google Cloud Platform credentials for DICOMweb and Orthanc
+ * Copyright (C) 2019 Osimis S.A., Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * In addition, as a special exception, the copyright holders of this
+ * program give permission to link the code of its release with the
+ * OpenSSL project's "OpenSSL" library (or with modified versions of it
+ * that use the same license as the "OpenSSL" library), and distribute
+ * the linked executables. You must obey the GNU General Public License
+ * in all respects for all of the code used other than "OpenSSL". If you
+ * modify file(s) with this exception, you may extend this exception to
+ * your version of the file(s), but you are not obligated to do so. If
+ * you do not wish to do so, delete this exception statement from your
+ * version. If you delete this exception statement from all source files
+ * in the program, then also delete it here.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+
+#pragma once
+
+#include "GoogleAccount.h"
+
+#include <boost/thread.hpp>
+
+class GoogleUpdater : public boost::noncopyable
+{
+private:
+  enum State
+  {
+    State_Setup,
+    State_Running,
+    State_Done
+  };
+
+  static void Worker(const State* state,
+                     const GoogleAccount* account,
+                     long refreshIntervalSeconds);
+
+  State                        state_;
+  std::vector<boost::thread*>  workers_;
+
+  // Singleton
+  GoogleUpdater() :
+    state_(State_Setup)
+  {
+  }
+
+public:
+  static GoogleUpdater& GetInstance()
+  {
+    static GoogleUpdater updater;
+    return updater;
+  }
+
+  ~GoogleUpdater();
+
+  void Start();
+  
+  void Stop();
+};