chrome/browser/media_galleries/media_scan_manager.h

   1 // Copyright 2014 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_GALLERIES_MEDIA_SCAN_MANAGER_H_
   6 #define CHROME_BROWSER_MEDIA_GALLERIES_MEDIA_SCAN_MANAGER_H_
   7
   8 #include <map>
   9 #include <set>
  10 #include <string>
  11
  12 #include "base/basictypes.h"
  13 #include "base/compiler_specific.h"
  14 #include "base/memory/scoped_ptr.h"
  15 #include "base/memory/weak_ptr.h"
  16 #include "base/scoped_observer.h"
  17 #include "base/time/time.h"
  18 #include "chrome/browser/media_galleries/media_folder_finder.h"
  19 #include "chrome/browser/media_galleries/media_scan_types.h"
  20 #include "extensions/browser/extension_registry_observer.h"
  21
  22 class MediaScanManagerObserver;
  23 class Profile;
  24
  25 namespace extensions {
  26 class Extension;
  27 class ExtensionRegistry;
  28 }
  29
  30 // The MediaScanManager is owned by MediaFileSystemRegistry, which is global.
  31 // This class manages multiple 'virtual' media scans, up to one per extension
  32 // per profile, and also manages the one physical scan backing them.
  33 // This class lives and is called on the UI thread.
  34 class MediaScanManager : public extensions::ExtensionRegistryObserver {
  35  public:
  36   MediaScanManager();
  37   virtual ~MediaScanManager();
  38
  39   // There can only be ever one observer registered per profile. Does not take
  40   // ownership of |observer|. An observer must be registered before scanning.
  41   void AddObserver(Profile* profile, MediaScanManagerObserver* observer);
  42   void RemoveObserver(Profile* profile);
  43
  44   // Must be called when |profile| is shut down.
  45   void CancelScansForProfile(Profile* profile);
  46
  47   // The results of the scan are reported to the registered
  48   // MediaScanManagerObserver via OnScanFinished. There must be an observer
  49   // registered for |profile| before the scan starts.
  50   void StartScan(Profile* profile, const extensions::Extension* extension,
  51                  bool user_gesture);
  52   void CancelScan(Profile* profile, const extensions::Extension* extension);
  53
  54  protected:
  55   friend class MediaGalleriesPlatformAppBrowserTest;
  56
  57   typedef base::Callback<MediaFolderFinder*(
  58       const MediaFolderFinder::MediaFolderFinderResultsCallback&)>
  59           MediaFolderFinderFactory;
  60
  61   void SetMediaFolderFinderFactory(const MediaFolderFinderFactory& factory);
  62
  63  private:
  64   struct ScanObservers {
  65     ScanObservers();
  66     ~ScanObservers();
  67     MediaScanManagerObserver* observer;
  68     std::set<std::string /*extension id*/> scanning_extensions;
  69   };
  70   typedef std::map<Profile*, ScanObservers> ScanObserverMap;
  71
  72   // extensions::ExtensionRegistryObserver implementation.
  73   virtual void OnExtensionUnloaded(
  74       content::BrowserContext* browser_context,
  75       const extensions::Extension* extension,
  76       extensions::UnloadedExtensionInfo::Reason reason) OVERRIDE;
  77
  78   bool ScanInProgress() const;
  79
  80   void OnScanCompleted(
  81       bool success,
  82       const MediaFolderFinder::MediaFolderFinderResults& found_folders);
  83
  84   void OnFoundContainerDirectories(
  85       const MediaFolderFinder::MediaFolderFinderResults& found_folders,
  86       const MediaFolderFinder::MediaFolderFinderResults& container_folders);
  87
  88   scoped_ptr<MediaFolderFinder> folder_finder_;
  89
  90   base::Time scan_start_time_;
  91
  92   // If not NULL, used to create |folder_finder_|. Used for testing.
  93   MediaFolderFinderFactory testing_folder_finder_factory_;
  94
  95   // Set of extensions (on all profiles) that have an in-progress scan.
  96   ScanObserverMap observers_;
  97
  98   ScopedObserver<extensions::ExtensionRegistry,
  99                  extensions::ExtensionRegistryObserver>
 100       scoped_extension_registry_observer_;
 101
 102   base::WeakPtrFactory<MediaScanManager> weak_factory_;
 103
 104   DISALLOW_COPY_AND_ASSIGN(MediaScanManager);
 105 };
 106
 107 #endif  // CHROME_BROWSER_MEDIA_GALLERIES_MEDIA_SCAN_MANAGER_H_