--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Sources/ICallbackRegistration.h	Thu Jun 10 18:19:27 2021 +0200
@@ -0,0 +1,43 @@
+/**
+ * Python plugin for Orthanc
+ * Copyright (C) 2020-2021 Osimis S.A., Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU Affero General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * 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
+ * Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+
+#pragma once
+
+#include "PythonHeaderWrapper.h"
+
+#include <boost/noncopyable.hpp>
+#include <string>
+
+class ICallbackRegistration : public boost::noncopyable
+{
+public:
+  virtual ~ICallbackRegistration()
+  {
+  }
+
+  virtual void Register() = 0;
+
+  // The GIL must be locked
+  static PyObject *Apply(ICallbackRegistration& registration,
+                         PyObject* args,
+                         PyObject*& singletonCallback,
+                         const std::string& details);
+
+  static void Unregister(PyObject*& singletonCallback);
+};