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