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