Add mate::TrackableObject

atom/browser/api/trackable_object.h

@@ -0,0 +1,43 @@
+// Copyright (c) 2015 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#ifndef ATOM_BROWSER_API_TRACKABLE_OBJECT_H_
+#define ATOM_BROWSER_API_TRACKABLE_OBJECT_H_
+
+#include "atom/browser/api/event_emitter.h"
+#include "atom/common/id_weak_map.h"
+
+namespace mate {
+
+// All instances of TrackableObject will be kept in a weak map and can be got
+// from its ID.
+class TrackableObject : public mate::EventEmitter {
+ public:
+  // Find out the TrackableObject from its ID in weak map:
+  static TrackableObject* FromWeakMapID(v8::Isolate* isolate, int32_t id);
+
+  // Releases all weak references in weak map, called when app is terminating.
+  static void ReleaseAllWeakReferences();
+
+  // mate::Wrappable:
+  void AfterInit(v8::Isolate* isolate) override;
+
+  // The ID in weak map.
+  int32_t weak_map_id() const { return weak_map_id_; }
+
+ protected:
+  TrackableObject();
+  ~TrackableObject() override;
+
+ private:
+  static atom::IDWeakMap weak_map_;
+
+  int32_t weak_map_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(TrackableObject);
+};
+
+}  // namespace mate
+
+#endif  // ATOM_BROWSER_API_TRACKABLE_OBJECT_H_