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       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 {
      11             : namespace dom {
      12             : 
      13             : /**
      14             :  * A PrincipalChangeObserver for any type, but originating from DOMMediaStream,
      15             :  * then expanded to MediaStreamTrack.
      16             :  *
      17             :  * Used to learn about dynamic changes to an object's principal.
      18             :  * Operations relating to these observers must be confined to the main thread.
      19             :  */
      20             : template<typename T>
      21           1 : class PrincipalChangeObserver
      22             : {
      23             : public:
      24             :   virtual void PrincipalChanged(T* aArg) = 0;
      25             : };
      26             : 
      27             : } // namespace dom
      28             : } // namespace mozilla
      29             : 
      30             : #endif /* MOZILLA_PRINCIPALCHANGEOBSERVER_H_ */