Implement mediaGalleriesPrivate api to notify extensions about gallery changed events.

chrome/browser/extensions/api/media_galleries_private/gallery_watch_manager_factory.h

Index: chrome/browser/extensions/api/media_galleries_private/gallery_watch_manager_factory.h
diff --git a/chrome/browser/extensions/api/media_galleries_private/gallery_watch_manager_factory.h b/chrome/browser/extensions/api/media_galleries_private/gallery_watch_manager_factory.h
new file mode 100644
index 0000000000000000000000000000000000000000..9d61c9365082504e9a641881ccbac24f2d9b15ab
--- /dev/null
+++ b/chrome/browser/extensions/api/media_galleries_private/gallery_watch_manager_factory.h
@@ -0,0 +1,62 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_EXTENSIONS_API_MEDIA_GALLERIES_PRIVATE_GALLERY_WATCH_MANAGER_FACTORY_H_
+#define CHROME_BROWSER_EXTENSIONS_API_MEDIA_GALLERIES_PRIVATE_GALLERY_WATCH_MANAGER_FACTORY_H_
+
+#include <map>
+
+#include "base/lazy_instance.h"
+#include "base/threading/thread_checker.h"
+
+class Profile;
+
+namespace extensions {
+
+class GalleryWatchManager;
+
+// Singleton that associate GalleryWatchManager objects with profiles. This
+// class is constructed, destructed and operated on the FILE thread.
+class GalleryWatchManagerFactory {

[Lei Zhang, 2012/12/15 04:13:21]

Can you just replace this with a map in gallery_watch_manager.cc's anonymous
namespace and expose the Get/Has function via static methods? Then you can make
the GalleryWatchManager's ctor private, since this is really the intended way to
create a GalleryWatchManager.

[kmadhusu, 2012/12/17 23:58:05]

Done.

+ public:
+  // Returns the GalleryFilePathWatchManagerFactory instance.
+  static GalleryWatchManagerFactory* GetInstance();
+
+  // Returns true if an GalleryWatchManager already exists for the specified
+  // |profile|.
+  bool HasForProfile(const Profile* profile);
+
+  // Returns the GalleryWatchManager for |profile|, creating it if it is not
+  // yet created.
+  GalleryWatchManager* GetForProfile(const Profile* profile);
+
+  // Handles profile shutdown event.
+  void OnProfileShutdown(const Profile* profile);
+
+ private:
+  friend struct base::DefaultLazyInstanceTraits<GalleryWatchManagerFactory>;
+
+  typedef std::map<const Profile*, GalleryWatchManager*> WatchManagerMap;
+
+  // Use GetInstance().
+  GalleryWatchManagerFactory();
+
+  // Leaky lazy instance. Destructor should not be called.
+  virtual ~GalleryWatchManagerFactory();
+
+  // Map to keep track of profile specific GalleryWatchManager objects.
+  // Key: Profile*.
+  // Value: GalleryWatchManager*.
+  // This map owns the GalleryWatchManager object.
+  WatchManagerMap gallery_watch_managers_;
+
+  // Make sure all the member functions are called on the right thread.
+  base::ThreadChecker thread_checker_;
+
+  DISALLOW_COPY_AND_ASSIGN(GalleryWatchManagerFactory);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_MEDIA_GALLERIES_PRIVATE_GALLERY_WATCH_MANAGER_FACTORY_H_