1 // Copyright 2013 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 STORAGE_BROWSER_FILEAPI_OPEN_FILE_HANDLE_CONTEXT_H_ 6 #define STORAGE_BROWSER_FILEAPI_OPEN_FILE_HANDLE_CONTEXT_H_ 7 8 #include <map> 9 10 #include "base/basictypes.h" 11 #include "base/files/file_path.h" 12 #include "base/memory/ref_counted.h" 13 #include "base/memory/weak_ptr.h" 14 #include "storage/browser/storage_browser_export.h" 15 #include "storage/common/fileapi/file_system_types.h" 16 #include "url/gurl.h" 17 18 namespace storage { 19 20 class QuotaReservationBuffer; 21 22 // This class represents a underlying file of a managed FileSystem file. 23 // The instance keeps alive while at least one consumer keeps an open file 24 // handle. 25 // This class is usually manipulated only via OpenFileHandle. 26 class OpenFileHandleContext : public base::RefCounted<OpenFileHandleContext> { 27 public: 28 OpenFileHandleContext(const base::FilePath& platform_path, 29 QuotaReservationBuffer* reservation_buffer); 30 31 // Updates the max written offset and returns the amount of growth. 32 int64 UpdateMaxWrittenOffset(int64 offset); 33 34 void AddAppendModeWriteAmount(int64 amount); 35 36 const base::FilePath& platform_path() const { 37 return platform_path_; 38 } 39 40 int64 GetEstimatedFileSize() const; 41 int64 GetMaxWrittenOffset() const; 42 43 private: 44 friend class base::RefCounted<OpenFileHandleContext>; 45 virtual ~OpenFileHandleContext(); 46 47 int64 initial_file_size_; 48 int64 maximum_written_offset_; 49 int64 append_mode_write_amount_; 50 base::FilePath platform_path_; 51 52 scoped_refptr<QuotaReservationBuffer> reservation_buffer_; 53 54 base::SequenceChecker sequence_checker_; 55 56 DISALLOW_COPY_AND_ASSIGN(OpenFileHandleContext); 57 }; 58 59 } // namespace storage 60 61 #endif // STORAGE_BROWSER_FILEAPI_OPEN_FILE_HANDLE_CONTEXT_H_ 62
