Home | History | Annotate | Download | only in blob 
      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_
     83