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
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
// Copyright 2015 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_BLOB_SHAREABLE_BLOB_DATA_ITEM_H_
#define STORAGE_BROWSER_BLOB_SHAREABLE_BLOB_DATA_ITEM_H_
#include <string>
#include "base/component_export.h"
#include "base/functional/callback_helpers.h"
#include "base/hash/hash.h"
#include "base/memory/ref_counted.h"
#include "storage/browser/blob/blob_memory_controller.h"
namespace storage {
class BlobDataItem;
// This class allows blob items to be shared between blobs. This class contains
// both the blob data item and the uuids of all the blobs using this item.
// The data in this class (the item) is immutable, but the item itself can be
// swapped out with an item with the same data but a different backing (think
// RAM vs file backed).
// We also allow the storage of a memory quota allocation object which is used
// for memory quota reclamation.
class COMPONENT_EXPORT(STORAGE_BROWSER) ShareableBlobDataItem
: public base::RefCounted<ShareableBlobDataItem> {
public:
enum State {
// We're an item that needs quota (either disk or memory).
QUOTA_NEEDED,
// We have requested quota from the BlobMemoryController.
QUOTA_REQUESTED,
// Space has been allocated for this item in the BlobMemoryController, but
// it may not yet be populated.
QUOTA_GRANTED,
// We're a populated item that needed quota.
POPULATED_WITH_QUOTA,
// We're a populated item that didn't need quota.
POPULATED_WITHOUT_QUOTA
};
ShareableBlobDataItem(scoped_refptr<BlobDataItem> item, State state);
ShareableBlobDataItem(const ShareableBlobDataItem&) = delete;
ShareableBlobDataItem& operator=(const ShareableBlobDataItem&) = delete;
const scoped_refptr<BlobDataItem>& item() const { return item_; }
void set_item(scoped_refptr<BlobDataItem> item);
// This is a unique auto-incrementing id assigned to this item on
// construction. It is used to keep track of this item in an LRU data
// structure for eviction to disk.
uint64_t item_id() const { return item_id_; }
State state() const { return state_; }
void set_state(State state) { state_ = state; }
bool IsPopulated() const {
return state_ == POPULATED_WITH_QUOTA || state_ == POPULATED_WITHOUT_QUOTA;
}
bool HasGrantedQuota() const {
return state_ == POPULATED_WITH_QUOTA || state_ == QUOTA_GRANTED;
}
private:
friend class BlobMemoryController;
friend class BlobMemoryControllerTest;
friend class BlobStorageContext;
friend class base::RefCounted<ShareableBlobDataItem>;
friend COMPONENT_EXPORT(STORAGE_BROWSER) void PrintTo(
const ShareableBlobDataItem& x,
::std::ostream* os);
~ShareableBlobDataItem();
void set_memory_allocation(
std::unique_ptr<BlobMemoryController::MemoryAllocation> allocation) {
memory_allocation_ = std::move(allocation);
}
bool has_memory_allocation() { return static_cast<bool>(memory_allocation_); }
// This is a unique identifier for this ShareableBlobDataItem.
const uint64_t item_id_;
State state_;
scoped_refptr<BlobDataItem> item_;
std::unique_ptr<BlobMemoryController::MemoryAllocation> memory_allocation_;
};
COMPONENT_EXPORT(STORAGE_BROWSER)
bool operator==(const ShareableBlobDataItem& a, const ShareableBlobDataItem& b);
COMPONENT_EXPORT(STORAGE_BROWSER)
bool operator!=(const ShareableBlobDataItem& a, const ShareableBlobDataItem& b);
} // namespace storage
#endif // STORAGE_BROWSER_BLOB_SHAREABLE_BLOB_DATA_ITEM_H_
|
