1// Copyright 2013 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_SEARCH_HOTWORD_SERVICE_FACTORY_H_
6#define CHROME_BROWSER_SEARCH_HOTWORD_SERVICE_FACTORY_H_
7
8#include "base/memory/singleton.h"
9#include "chrome/browser/media/media_capture_devices_dispatcher.h"
10#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
11
12class HotwordService;
13class Profile;
14
15// Singleton that owns all HotwordServices and associates them with Profiles.
16class HotwordServiceFactory : public MediaCaptureDevicesDispatcher::Observer,
17                              public BrowserContextKeyedServiceFactory {
18 public:
19  // Returns the HotwordService for |context|.
20  static HotwordService* GetForProfile(content::BrowserContext* context);
21
22  static HotwordServiceFactory* GetInstance();
23
24  // Returns true if the hotwording service is available for |context|.
25  static bool IsServiceAvailable(content::BrowserContext* context);
26
27  // Returns true if hotwording is allowed for |context|.
28  static bool IsHotwordAllowed(content::BrowserContext* context);
29
30  // Returns the current error message for the service for |context|.
31  // A value of 0 indicates no error.
32  static int GetCurrentError(content::BrowserContext* context);
33
34  // Returns the current known state of the microphone. Since this state
35  // is browser (not profile) specific, it resides in the factory.
36  static bool IsMicrophoneAvailable();
37
38  // Overridden from MediaCaptureDevicesDispatcher::Observer
39  virtual void OnUpdateAudioDevices(
40      const content::MediaStreamDevices& devices) OVERRIDE;
41
42  // This will kick off the monitor that calls OnUpdateAudioDevices when the
43  // number of audio devices changes (or is initialized). It needs to be a
44  // separate function so it can be called after the service is initialized
45  // (i.e., after startup). The monitor can't be initialized during startup
46  // because it would slow down startup too much so it is delayed and not
47  // called until it's needed by the webui in browser_options_handler.
48  void UpdateMicrophoneState();
49
50 private:
51  friend struct DefaultSingletonTraits<HotwordServiceFactory>;
52
53  HotwordServiceFactory();
54  virtual ~HotwordServiceFactory();
55
56  // Overrides from BrowserContextKeyedServiceFactory:
57  virtual void RegisterProfilePrefs(
58      user_prefs::PrefRegistrySyncable* registry) OVERRIDE;
59  virtual KeyedService* BuildServiceInstanceFor(
60      content::BrowserContext* context) const OVERRIDE;
61
62  // Must be called from the UI thread since the instance of
63  // MediaCaptureDevicesDispatcher can only be accessed on the UI thread.
64  void InitializeMicrophoneObserver();
65
66  bool microphone_available() { return microphone_available_; }
67
68  bool microphone_available_;
69
70  DISALLOW_COPY_AND_ASSIGN(HotwordServiceFactory);
71};
72
73#endif  // CHROME_BROWSER_SEARCH_HOTWORD_SERVICE_FACTORY_H_
74