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      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_
     86