dom/media/PrincipalChangeObserver.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef MOZILLA_PRINCIPALCHANGEOBSERVER_H_
   8 #define MOZILLA_PRINCIPALCHANGEOBSERVER_H_
   9
  10 namespace mozilla::dom {
  11
  12 /**
  13  * A PrincipalChangeObserver for any type, but originating from DOMMediaStream,
  14  * then expanded to MediaStreamTrack.
  15  *
  16  * Used to learn about dynamic changes to an object's principal.
  17  * Operations relating to these observers must be confined to the main thread.
  18  */
  19 template <typename T>
  20 class PrincipalChangeObserver {
  21  public:
  22   virtual void PrincipalChanged(T* aArg) = 0;
  23 };
  24
  25 }  // namespace mozilla::dom
  26
  27 #endif /* MOZILLA_PRINCIPALCHANGEOBSERVER_H_ */