Move device notification impl out of chrome/browser/media_gallery

chrome/browser/media_gallery/removable_device_notifications_linux.h

-// 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.
-
-// RemovableDeviceNotificationsLinux listens for mount point changes, notifies
-// the SystemMonitor about the addition and deletion of media devices, and
-// answers queries about mounted devices.
-
-#ifndef CHROME_BROWSER_MEDIA_GALLERY_REMOVABLE_DEVICE_NOTIFICATIONS_LINUX_H_
-#define CHROME_BROWSER_MEDIA_GALLERY_REMOVABLE_DEVICE_NOTIFICATIONS_LINUX_H_
-
-#if defined(OS_CHROMEOS)
-#error "Use the ChromeOS-specific implementation instead."
-#endif
-
-#include <map>
-#include <set>
-#include <string>
-#include <utility>
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "base/files/file_path_watcher.h"
-#include "base/memory/ref_counted.h"
-#include "base/system_monitor/system_monitor.h"
-#include "content/public/browser/browser_thread.h"
-
-class FilePath;
-
-// Gets device information given a |device_path|. On success, returns true and
-// fills in |unique_id|, |name|, and |removable|.
-typedef bool (*GetDeviceInfoFunc)(const FilePath& device_path,
-                                  std::string* unique_id, string16* name,
-                                  bool* removable);
-
-namespace chrome {
-
-class RemovableDeviceNotificationsLinux
-    : public base::RefCountedThreadSafe<RemovableDeviceNotificationsLinux,
-          content::BrowserThread::DeleteOnFileThread> {
- public:
-  // Should only be called by browser start up code.  Use GetInstance() instead.
-  explicit RemovableDeviceNotificationsLinux(const FilePath& path);
-
-  static RemovableDeviceNotificationsLinux* GetInstance();
-
-  // Must be called for RemovableDeviceNotificationsLinux to work.
-  void Init();
-
-  // Use |device_id| to find and return where the device is mounted.
-  FilePath GetDeviceMountPoint(const std::string& device_id) const;
-
-  // Finds the device that contains |path| and populates |device_info|.
-  // Returns false if unable to find the device.
-  bool GetDeviceInfoForPath(
-      const FilePath& path,
-      base::SystemMonitor::RemovableStorageInfo* device_info) const;
-
- protected:
-  // Only for use in unit tests.
-  RemovableDeviceNotificationsLinux(const FilePath& path,
-                                    GetDeviceInfoFunc getDeviceInfo);
-
-  // Avoids code deleting the object while there are references to it.
-  // Aside from the base::RefCountedThreadSafe friend class, and derived
-  // classes, any attempts to call this dtor will result in a compile-time
-  // error.
-  virtual ~RemovableDeviceNotificationsLinux();
-
-  virtual void OnFilePathChanged(const FilePath& path, bool error);
-
- private:
-  friend class base::RefCountedThreadSafe<RemovableDeviceNotificationsLinux>;
-  friend class base::DeleteHelper<RemovableDeviceNotificationsLinux>;
-  friend struct content::BrowserThread::DeleteOnThread<
-      content::BrowserThread::FILE>;
-
-  // Structure to save mounted device information such as device path and unique
-  // identifier.
-  struct MountPointInfo {
-    MountPointInfo();
-
-    FilePath mount_device;
-    std::string device_id;
-    string16 device_name;
-  };
-
-  // Mapping of mount points to MountPointInfo.
-  typedef std::map<FilePath, MountPointInfo> MountMap;
-
-  // (mount point, priority)
-  // For devices that are mounted to multiple mount points, this helps us track
-  // which one we've notified system monitor about.
-  typedef std::map<FilePath, bool> ReferencedMountPoint;
-
-  // (mount device, map of known mount points)
-  // For each mount device, track the places it is mounted and which one (if
-  // any) we have notified system monitor about.
-  typedef std::map<FilePath, ReferencedMountPoint> MountPriorityMap;
-
-  // Do initialization on the File Thread.
-  void InitOnFileThread();
-
-  // Parses mtab file and find all changes.
-  void UpdateMtab();
-
-  // Adds |mount_device| as mounted on |mount_point|.  If the device is a new
-  // device SystemMonitor is notified.
-  void AddNewMount(const FilePath& mount_device, const FilePath& mount_point);
-
-  // Whether Init() has been called or not.
-  bool initialized_;
-
-  // Mtab file that lists the mount points.
-  const FilePath mtab_path_;
-
-  // Watcher for |mtab_path_|.
-  base::files::FilePathWatcher file_watcher_;
-
-  // Set of known file systems that we care about.
-  std::set<std::string> known_file_systems_;
-
-  // Function handler to get device information. This is useful to set a mock
-  // handler for unit testing.
-  GetDeviceInfoFunc get_device_info_func_;
-
-  // Mapping of relevant mount points and their corresponding mount devices.
-  // Keep in mind on Linux, a device can be mounted at multiple mount points,
-  // and multiple devices can be mounted at a mount point.
-  MountMap mount_info_map_;
-
-  // Because a device can be mounted to multiple places, we only want to
-  // notify about one of them. If (and only if) that one is unmounted, we need
-  // to notify about it's departure and notify about another one of it's mount
-  // points.
-  MountPriorityMap mount_priority_map_;
-
-  DISALLOW_COPY_AND_ASSIGN(RemovableDeviceNotificationsLinux);
-};
-
-}  // namespace chrome
-
-#endif  // CHROME_BROWSER_MEDIA_GALLERY_REMOVABLE_DEVICE_NOTIFICATIONS_LINUX_H_