chrome/browser/media/router/media_sinks_observer.h

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROME_BROWSER_MEDIA_ROUTER_MEDIA_SINKS_OBSERVER_H_
   6 #define CHROME_BROWSER_MEDIA_ROUTER_MEDIA_SINKS_OBSERVER_H_
   7
   8 #include <vector>
   9
  10 #include "base/macros.h"
  11 #include "chrome/browser/media/router/media_sink.h"
  12 #include "chrome/browser/media/router/media_source.h"
  13
  14 namespace media_router {
  15
  16 class MediaRouter;
  17
  18 // Base class for observing when the collection of sinks compatible with
  19 // a MediaSource has been updated.
  20 // A MediaSinksObserver implementation can be registered to MediaRouter to
  21 // receive results. It can then interpret / process the results accordingly.
  22 class MediaSinksObserver {
  23  public:
  24   // Constructs an observer that will observe for sinks compatible
  25   // with |source|.
  26   MediaSinksObserver(MediaRouter* router, const MediaSource& source);
  27   virtual ~MediaSinksObserver();
  28
  29   // This function is invoked when the list of sinks compatible
  30   // with |source_| has been updated.
  31   // Implementations may not perform operations that modify the Media Router's
  32   // observer list. In particular, invoking this observer's destructor within
  33   // OnSinksReceived will result in undefined behavior.
  34   virtual void OnSinksReceived(const std::vector<MediaSink>& sinks) {}
  35
  36   const MediaSource& source() const { return source_; }
  37
  38  private:
  39   const MediaSource source_;
  40   MediaRouter* router_;
  41
  42   DISALLOW_COPY_AND_ASSIGN(MediaSinksObserver);
  43 };
  44
  45 }  // namespace media_router
  46
  47 #endif  // CHROME_BROWSER_MEDIA_ROUTER_MEDIA_SINKS_OBSERVER_H_