chrome/browser/chromeos/file_manager/snapshot_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_CHROMEOS_FILE_MANAGER_SNAPSHOT_MANAGER_H_
   6 #define CHROME_BROWSER_CHROMEOS_FILE_MANAGER_SNAPSHOT_MANAGER_H_
   7
   8 #include <deque>
   9
  10 #include "base/callback_forward.h"
  11 #include "base/files/file.h"
  12 #include "base/memory/ref_counted.h"
  13 #include "base/memory/weak_ptr.h"
  14
  15 class Profile;
  16
  17 namespace base {
  18 class FilePath;
  19 }  // namespace base
  20
  21 namespace storage {
  22 class FileSystemURL;
  23 }  // namespace storage
  24
  25 namespace storage {
  26 class ShareableFileReference;
  27 }  // namespace storage
  28
  29 namespace file_manager {
  30
  31 // Utility class for creating a snapshot of a file system file on local disk.
  32 // The class wraps the underlying implementation of fileapi's CreateSnapshotFile
  33 // and prolongs the lifetime of snapshot files so that the client code that just
  34 // accepts file paths works without problems.
  35 class SnapshotManager {
  36  public:
  37   // The callback type for CreateManagedSnapshot.
  38   typedef base::Callback<void(const base::FilePath&)> LocalPathCallback;
  39
  40   explicit SnapshotManager(Profile* profile);
  41   ~SnapshotManager();
  42
  43   // Creates a snapshot file copy of a file system file |absolute_file_path| and
  44   // returns back to |callback|. Returns empty path for failure.
  45   void CreateManagedSnapshot(const base::FilePath& absolute_file_path,
  46                              const LocalPathCallback& callback);
  47
  48   // Struct for keeping the snapshot file reference with its file size used for
  49   // computing the necessity of clean up.
  50   struct FileReferenceWithSizeInfo {
  51     FileReferenceWithSizeInfo(
  52         scoped_refptr<storage::ShareableFileReference> ref,
  53         int64 size);
  54     ~FileReferenceWithSizeInfo();
  55     scoped_refptr<storage::ShareableFileReference> file_ref;
  56     int64 file_size;
  57   };
  58
  59  private:
  60   // Part of CreateManagedSnapshot.
  61   void CreateManagedSnapshotAfterSpaceComputed(
  62       const storage::FileSystemURL& filesystem_url,
  63       const LocalPathCallback& callback,
  64       int64 needed_space);
  65
  66   // Part of CreateManagedSnapshot.
  67   void OnCreateSnapshotFile(
  68       const LocalPathCallback& callback,
  69       base::File::Error result,
  70       const base::File::Info& file_info,
  71       const base::FilePath& platform_path,
  72       const scoped_refptr<storage::ShareableFileReference>& file_ref);
  73
  74   Profile* profile_;
  75   std::deque<FileReferenceWithSizeInfo> file_refs_;
  76
  77   // Note: This should remain the last member so it'll be destroyed and
  78   // invalidate the weak pointers before any other members are destroyed.
  79   base::WeakPtrFactory<SnapshotManager> weak_ptr_factory_;
  80   DISALLOW_COPY_AND_ASSIGN(SnapshotManager);
  81 };
  82
  83 }  // namespace file_manager
  84
  85 #endif  // CHROME_BROWSER_CHROMEOS_FILE_MANAGER_SNAPSHOT_MANAGER_H_