Added refresh on filesystem change

chrome/browser/chromeos/extensions/file_browser_event_router.h

 // Copyright (c) 2011 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_CHROMEOS_EXTENSIONS_FILE_BROWSER_EVENT_ROUTER_H_
 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_BROWSER_EVENT_ROUTER_H_
 #pragma once
 
 #include <map>
 #include <set>
@@ skipping 30 matching lines @@
   // MountLibrary::Observer overrides.
   virtual void DiskChanged(chromeos::MountLibraryEventType event,
                            const chromeos::MountLibrary::Disk* disk) OVERRIDE;
   virtual void DeviceChanged(chromeos::MountLibraryEventType event,
                              const std::string& device_path) OVERRIDE;
   virtual void MountCompleted(chromeos::MountLibrary::MountEvent event_type,
       chromeos::MountError error_code,
       const chromeos::MountLibrary::MountPointInfo& mount_info) OVERRIDE;
 
  private:
-  typedef struct FileWatcherExtensions {
-    FileWatcherExtensions(const FilePath& path,
-                          const std::string& extension_id) {
-      file_watcher.reset(new base::files::FilePathWatcher());
-      virtual_path = path;
-      extensions.insert(extension_id);
-    }
-    ~FileWatcherExtensions() {}
-    linked_ptr<base::files::FilePathWatcher> file_watcher;
-    FilePath local_path;
-    FilePath virtual_path;
-    std::set<std::string> extensions;
-  } FileWatcherProcess;
-  typedef std::map<FilePath, FileWatcherExtensions*> WatcherMap;
-
   // Helper class for passing through file watch notification events.
   class FileWatcherDelegate : public base::files::FilePathWatcher::Delegate {
    public:
     explicit FileWatcherDelegate(ExtensionFileBrowserEventRouter* router);
 
    private:
     // base::files::FilePathWatcher::Delegate overrides.
     virtual void OnFilePathChanged(const FilePath& path) OVERRIDE;
     virtual void OnFilePathError(const FilePath& path) OVERRIDE;
 
     void HandleFileWatchOnUIThread(const FilePath& local_path, bool got_error);
 
     ExtensionFileBrowserEventRouter* router_;
   };
 
+  typedef std::map<std::string, int> ExtensionUsageRegistry;
+
+  class FileWatcherExtensions {
+   public:
+    FileWatcherExtensions(const FilePath& path,
+        const std::string& extension_id);
+
+    ~FileWatcherExtensions() {}
+
+    void AddExtension(const std::string& extension_id);
+
+    void RemoveExtension(const std::string& extension_id);
+
+    const ExtensionUsageRegistry& GetExtensions() const;
+
+    unsigned int GetRefCount() const;
+
+    const FilePath& GetVirtualPath() const;
+
+    bool Watch(const FilePath& path, FileWatcherDelegate* delegate);
+
+   private:
+    linked_ptr<base::files::FilePathWatcher> file_watcher;
+    FilePath local_path;
+    FilePath virtual_path;
+    ExtensionUsageRegistry extensions;
+    unsigned int ref_count;
+  };
+
+  typedef std::map<FilePath, FileWatcherExtensions*> WatcherMap;
+
   // USB mount event handlers.
   void OnDiskAdded(const chromeos::MountLibrary::Disk* disk);
   void OnDiskRemoved(const chromeos::MountLibrary::Disk* disk);
   void OnDiskMounted(const chromeos::MountLibrary::Disk* disk);
   void OnDiskUnmounted(const chromeos::MountLibrary::Disk* disk);
   void OnDeviceAdded(const std::string& device_path);
   void OnDeviceRemoved(const std::string& device_path);
   void OnDeviceScanned(const std::string& device_path);
   void OnFormattingStarted(const std::string& device_path, bool success);
   void OnFormattingFinished(const std::string& device_path, bool success);
 
   // Process file watch notifications.
   void HandleFileWatchNotification(const FilePath& path,
                                    bool got_error);
 
   // Sends folder change event.
   void DispatchFolderChangeEvent(const FilePath& path, bool error,
-                                 const std::set<std::string>& extensions);
+                                 const ExtensionUsageRegistry& extensions);
 
   // Sends filesystem changed extension message to all renderers.
   void DispatchDiskEvent(const chromeos::MountLibrary::Disk* disk, bool added);
 
   void DispatchMountCompletedEvent(chromeos::MountLibrary::MountEvent event,
       chromeos::MountError error_code,
       const chromeos::MountLibrary::MountPointInfo& mount_info);
 
   void RemoveBrowserFromVector(const std::string& path);
 
   // Used to create a window of a standard size, and add it to a list
   // of tracked browser windows in case that device goes away.
   void OpenFileBrowse(const std::string& url,
                       const std::string& device_path,
                       bool small);
 
   scoped_refptr<FileWatcherDelegate> delegate_;
   WatcherMap file_watchers_;
   scoped_ptr<FileBrowserNotifications> notifications_;
   Profile* profile_;
   base::Lock lock_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionFileBrowserEventRouter);
 };
 
 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_BROWSER_EVENT_ROUTER_H_