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1 // Copyright (c) 2015 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2015 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef STORAGE_BROWSER_BLOB_BLOB_DATA_ITEM_H_ | 5 #ifndef STORAGE_BROWSER_BLOB_BLOB_DATA_ITEM_H_ |
6 #define STORAGE_BROWSER_BLOB_BLOB_DATA_ITEM_H_ | 6 #define STORAGE_BROWSER_BLOB_BLOB_DATA_ITEM_H_ |
7 | 7 |
8 #include <stdint.h> | 8 #include <stdint.h> |
9 | 9 |
10 #include <memory> | 10 #include <memory> |
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21 | 21 |
22 namespace storage { | 22 namespace storage { |
23 class BlobDataBuilder; | 23 class BlobDataBuilder; |
24 class BlobStorageContext; | 24 class BlobStorageContext; |
25 | 25 |
26 // Ref counted blob item. This class owns the backing data of the blob item. The | 26 // Ref counted blob item. This class owns the backing data of the blob item. The |
27 // backing data is immutable, and cannot change after creation. The purpose of | 27 // backing data is immutable, and cannot change after creation. The purpose of |
28 // this class is to allow the resource to stick around in the snapshot even | 28 // this class is to allow the resource to stick around in the snapshot even |
29 // after the resource was swapped in the blob (either to disk or to memory) by | 29 // after the resource was swapped in the blob (either to disk or to memory) by |
30 // the BlobStorageContext. | 30 // the BlobStorageContext. |
31 class STORAGE_EXPORT BlobDataItem : public base::RefCounted<BlobDataItem> { | 31 class STORAGE_EXPORT BlobDataItem |
| 32 : public base::RefCountedThreadSafe<BlobDataItem> { |
32 public: | 33 public: |
33 // The DataHandle class is used to persist resources that are needed for | 34 // The DataHandle class is used to persist resources that are needed for |
34 // reading this BlobDataItem. This object will stay around while any reads are | 35 // reading this BlobDataItem. This object will stay around while any reads are |
35 // pending. If all blobs with this item are deleted or the item is swapped for | 36 // pending. If all blobs with this item are deleted or the item is swapped for |
36 // a different backend version (mem-to-disk or the reverse), then the item | 37 // a different backend version (mem-to-disk or the reverse), then the item |
37 // will be destructed after all pending reads are complete. | 38 // will be destructed after all pending reads are complete. |
38 class STORAGE_EXPORT DataHandle : public base::RefCounted<DataHandle> { | 39 class STORAGE_EXPORT DataHandle : public base::RefCounted<DataHandle> { |
39 protected: | 40 protected: |
40 virtual ~DataHandle() = 0; | 41 virtual ~DataHandle() = 0; |
41 | 42 |
42 private: | 43 private: |
43 friend class base::RefCounted<DataHandle>; | 44 friend class base::RefCounted<DataHandle>; |
44 }; | 45 }; |
45 | 46 |
| 47 explicit BlobDataItem(std::unique_ptr<DataElement> item); |
| 48 BlobDataItem(std::unique_ptr<DataElement> item, |
| 49 const scoped_refptr<DataHandle>& data_handle); |
| 50 BlobDataItem(std::unique_ptr<DataElement> item, |
| 51 const scoped_refptr<DataHandle>& data_handle, |
| 52 disk_cache::Entry* entry, |
| 53 int disk_cache_stream_index, |
| 54 int disk_cache_side_stream_index); |
| 55 |
46 DataElement::Type type() const { return item_->type(); } | 56 DataElement::Type type() const { return item_->type(); } |
47 const char* bytes() const { return item_->bytes(); } | 57 const char* bytes() const { return item_->bytes(); } |
48 const base::FilePath& path() const { return item_->path(); } | 58 const base::FilePath& path() const { return item_->path(); } |
49 const GURL& filesystem_url() const { return item_->filesystem_url(); } | 59 const GURL& filesystem_url() const { return item_->filesystem_url(); } |
50 const std::string& blob_uuid() const { return item_->blob_uuid(); } | 60 const std::string& blob_uuid() const { return item_->blob_uuid(); } |
51 uint64_t offset() const { return item_->offset(); } | 61 uint64_t offset() const { return item_->offset(); } |
52 uint64_t length() const { return item_->length(); } | 62 uint64_t length() const { return item_->length(); } |
53 const base::Time& expected_modification_time() const { | 63 const base::Time& expected_modification_time() const { |
54 return item_->expected_modification_time(); | 64 return item_->expected_modification_time(); |
55 } | 65 } |
56 const DataElement& data_element() const { return *item_; } | 66 const DataElement& data_element() const { return *item_; } |
57 const DataElement* data_element_ptr() const { return item_.get(); } | 67 const DataElement* data_element_ptr() const { return item_.get(); } |
58 DataElement* data_element_ptr() { return item_.get(); } | 68 DataElement* data_element_ptr() { return item_.get(); } |
59 | 69 |
60 disk_cache::Entry* disk_cache_entry() const { return disk_cache_entry_; } | 70 disk_cache::Entry* disk_cache_entry() const { return disk_cache_entry_; } |
61 int disk_cache_stream_index() const { return disk_cache_stream_index_; } | 71 int disk_cache_stream_index() const { return disk_cache_stream_index_; } |
62 int disk_cache_side_stream_index() const { | 72 int disk_cache_side_stream_index() const { |
63 return disk_cache_side_stream_index_; | 73 return disk_cache_side_stream_index_; |
64 } | 74 } |
65 | 75 |
| 76 const scoped_refptr<DataHandle>& data_handle() const { return data_handle_; } |
| 77 |
66 private: | 78 private: |
67 friend class BlobDataBuilder; | 79 friend class BlobDataBuilder; |
68 friend class BlobStorageContext; | 80 friend class BlobStorageContext; |
69 friend class base::RefCounted<BlobDataItem>; | 81 friend class base::RefCountedThreadSafe<BlobDataItem>; |
70 friend STORAGE_EXPORT void PrintTo(const BlobDataItem& x, ::std::ostream* os); | 82 friend STORAGE_EXPORT void PrintTo(const BlobDataItem& x, ::std::ostream* os); |
71 | 83 |
72 explicit BlobDataItem(std::unique_ptr<DataElement> item); | |
73 BlobDataItem(std::unique_ptr<DataElement> item, | |
74 const scoped_refptr<DataHandle>& data_handle); | |
75 BlobDataItem(std::unique_ptr<DataElement> item, | |
76 const scoped_refptr<DataHandle>& data_handle, | |
77 disk_cache::Entry* entry, | |
78 int disk_cache_stream_index, | |
79 int disk_cache_side_stream_index); | |
80 virtual ~BlobDataItem(); | 84 virtual ~BlobDataItem(); |
81 | 85 |
82 std::unique_ptr<DataElement> item_; | 86 std::unique_ptr<DataElement> item_; |
83 scoped_refptr<DataHandle> data_handle_; | 87 scoped_refptr<DataHandle> data_handle_; |
84 | 88 |
85 // This naked pointer is safe because the scope is protected by the DataHandle | 89 // This naked pointer is safe because the scope is protected by the DataHandle |
86 // instance for disk cache entries during the lifetime of this BlobDataItem. | 90 // instance for disk cache entries during the lifetime of this BlobDataItem. |
87 disk_cache::Entry* disk_cache_entry_; | 91 disk_cache::Entry* disk_cache_entry_; |
88 int disk_cache_stream_index_; // For TYPE_DISK_CACHE_ENTRY. | 92 int disk_cache_stream_index_; // For TYPE_DISK_CACHE_ENTRY. |
89 int disk_cache_side_stream_index_; // For TYPE_DISK_CACHE_ENTRY. | 93 int disk_cache_side_stream_index_; // For TYPE_DISK_CACHE_ENTRY. |
90 }; | 94 }; |
91 | 95 |
92 STORAGE_EXPORT bool operator==(const BlobDataItem& a, const BlobDataItem& b); | 96 STORAGE_EXPORT bool operator==(const BlobDataItem& a, const BlobDataItem& b); |
93 STORAGE_EXPORT bool operator!=(const BlobDataItem& a, const BlobDataItem& b); | 97 STORAGE_EXPORT bool operator!=(const BlobDataItem& a, const BlobDataItem& b); |
94 | 98 |
95 } // namespace storage | 99 } // namespace storage |
96 | 100 |
97 #endif // STORAGE_BROWSER_BLOB_BLOB_DATA_ITEM_H_ | 101 #endif // STORAGE_BROWSER_BLOB_BLOB_DATA_ITEM_H_ |
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