webkit/browser/blob/blob_storage_controller.h

   1 // Copyright (c) 2011 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 WEBKIT_BROWSER_BLOB_BLOB_STORAGE_CONTROLLER_H_
   6 #define WEBKIT_BROWSER_BLOB_BLOB_STORAGE_CONTROLLER_H_
   7
   8 #include <map>
   9 #include <string>
  10
  11 #include "base/containers/hash_tables.h"
  12 #include "base/memory/ref_counted.h"
  13 #include "base/process/process.h"
  14 #include "webkit/browser/webkit_storage_browser_export.h"
  15 #include "webkit/common/blob/blob_data.h"
  16
  17 class GURL;
  18
  19 namespace base {
  20 class FilePath;
  21 class Time;
  22 }
  23
  24 namespace webkit_blob {
  25
  26 // This class handles the logistics of blob Storage within the browser process.
  27 class WEBKIT_STORAGE_BROWSER_EXPORT BlobStorageController {
  28  public:
  29   BlobStorageController();
  30   ~BlobStorageController();
  31
  32   void StartBuildingBlob(const GURL& url);
  33   void AppendBlobDataItem(const GURL& url, const BlobData::Item& data_item);
  34   void FinishBuildingBlob(const GURL& url, const std::string& content_type);
  35   void AddFinishedBlob(const GURL& url, const BlobData* blob_data);
  36   void CloneBlob(const GURL& url, const GURL& src_url);
  37   void RemoveBlob(const GURL& url);
  38   BlobData* GetBlobDataFromUrl(const GURL& url);
  39
  40  private:
  41   friend class ViewBlobInternalsJob;
  42
  43   typedef base::hash_map<std::string, scoped_refptr<BlobData> > BlobMap;
  44   typedef std::map<BlobData*, int> BlobDataUsageMap;
  45
  46   void AppendStorageItems(BlobData* target_blob_data,
  47                           BlobData* src_blob_data,
  48                           uint64 offset,
  49                           uint64 length);
  50   void AppendFileItem(BlobData* target_blob_data,
  51                       const base::FilePath& file_path, uint64 offset,
  52                       uint64 length,
  53                       const base::Time& expected_modification_time);
  54   void AppendFileSystemFileItem(
  55       BlobData* target_blob_data,
  56       const GURL& url, uint64 offset, uint64 length,
  57       const base::Time& expected_modification_time);
  58
  59   bool RemoveFromMapHelper(BlobMap* map, const GURL& url);
  60
  61   void IncrementBlobDataUsage(BlobData* blob_data);
  62   // Returns true if no longer in use.
  63   bool DecrementBlobDataUsage(BlobData* blob_data);
  64
  65   BlobMap blob_map_;
  66   BlobMap unfinalized_blob_map_;
  67
  68   // Used to keep track of how much memory is being utitlized for blob data,
  69   // we count only the items of TYPE_DATA which are held in memory and not
  70   // items of TYPE_FILE.
  71   int64 memory_usage_;
  72
  73   // Multiple urls can refer to the same blob data, this map keeps track of
  74   // how many urls refer to a BlobData.
  75   BlobDataUsageMap blob_data_usage_count_;
  76
  77   DISALLOW_COPY_AND_ASSIGN(BlobStorageController);
  78 };
  79
  80 }  // namespace webkit_blob
  81
  82 #endif  // WEBKIT_BROWSER_BLOB_BLOB_STORAGE_CONTROLLER_H_