1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
|
// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef STORAGE_BROWSER_FILE_SYSTEM_QUOTA_OPEN_FILE_HANDLE_CONTEXT_H_
#define STORAGE_BROWSER_FILE_SYSTEM_QUOTA_OPEN_FILE_HANDLE_CONTEXT_H_
#include <stdint.h>
#include "base/files/file_path.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "storage/common/file_system/file_system_types.h"
namespace storage {
class QuotaReservationBuffer;
// This class represents a underlying file of a managed FileSystem file.
// The instance keeps alive while at least one consumer keeps an open file
// handle.
// This class is usually manipulated only via OpenFileHandle.
class OpenFileHandleContext : public base::RefCounted<OpenFileHandleContext> {
public:
OpenFileHandleContext(const base::FilePath& platform_path,
QuotaReservationBuffer* reservation_buffer);
OpenFileHandleContext(const OpenFileHandleContext&) = delete;
OpenFileHandleContext& operator=(const OpenFileHandleContext&) = delete;
// Updates the max written offset and returns the amount of growth.
int64_t UpdateMaxWrittenOffset(int64_t offset);
void AddAppendModeWriteAmount(int64_t amount);
const base::FilePath& platform_path() const { return platform_path_; }
int64_t GetEstimatedFileSize() const;
int64_t GetMaxWrittenOffset() const;
private:
friend class base::RefCounted<OpenFileHandleContext>;
virtual ~OpenFileHandleContext();
int64_t initial_file_size_;
int64_t maximum_written_offset_;
int64_t append_mode_write_amount_;
base::FilePath platform_path_;
scoped_refptr<QuotaReservationBuffer> reservation_buffer_;
SEQUENCE_CHECKER(sequence_checker_);
};
} // namespace storage
#endif // STORAGE_BROWSER_FILE_SYSTEM_QUOTA_OPEN_FILE_HANDLE_CONTEXT_H_
|
