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1 // Copyright 2015 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_BLOB_BLOB_TRANSPORT_STRATEGY_H_ | |
6 #define STORAGE_BROWSER_BLOB_BLOB_TRANSPORT_STRATEGY_H_ | |
7 | |
8 #include <vector> | |
9 | |
10 #include "base/macros.h" | |
11 #include "storage/browser/storage_browser_export.h" | |
12 #include "storage/common/data_element.h" | |
13 #include "storage/common/fileapi/blob_item_bytes_request.h" | |
14 | |
15 namespace storage { | |
16 | |
17 // This class determines and stores the strategy for asynchronously transporting | |
18 // memory from the renderer to the browser. This involves two transformations: | |
19 // 1. Transforming the data storage to be efficient in-transport. This can | |
20 // mean that data is consolidated from cross-blob or cross-file boundaries | |
21 // in the blob in a common block of shared memory or a file. | |
22 // 2. Transforming the transport data into the browser storage representation. | |
23 // This can simply mirror the renderer representation, or it can be instead | |
24 // pointing to transport representation with offsets and sizes. | |
25 // | |
26 // The initial implementation of this is simple, but the protocol allows any | |
27 // sort of flexibility, as everything has an offset and size specified. | |
28 class STORAGE_EXPORT BlobTransportStrategy { | |
29 public: | |
30 enum Mode { MODE_UNKNOWN = 0, MODE_NO_DISK, MODE_DISK }; | |
31 | |
32 enum Error { | |
33 ERROR_NONE = 0, | |
34 ERROR_TOO_LARGE, // This item can't fit in disk or memory | |
35 ERROR_INVALID_PARAMS | |
36 }; | |
37 | |
38 struct MemoryItemRequest { | |
39 size_t browser_item_index; | |
40 size_t browser_item_offset; | |
41 BlobItemBytesRequest message; | |
42 }; | |
43 | |
44 BlobTransportStrategy(); | |
45 virtual ~BlobTransportStrategy(); | |
46 | |
47 void Initialize(Mode mode, size_t max_ipc_memory_size, | |
48 size_t max_shared_memory_size, uint64_t max_file_size, | |
49 size_t max_blob_in_memory_size, uint64_t disk_space_left, | |
50 size_t memory_left, | |
51 const std::vector<DataElement> blob_item_infos); | |
kinuko
2015/04/30 15:04:21
nit: split the lines to have one parameter for eac
dmurph
2015/05/07 02:07:39
Done.
| |
52 | |
53 std::vector<uint64_t>& file_handles() { return file_handles_; } | |
54 | |
55 std::vector<size_t>& shared_memory_handles() { | |
56 return shared_memory_handles_; | |
57 } | |
kinuko
2015/04/30 15:04:21
Are these intentionally made non-const references?
dmurph
2015/05/07 02:07:39
Whoops, done.
| |
58 | |
59 const std::vector<MemoryItemRequest>& requests() const { return requests_; } | |
60 | |
61 Error error() const { return error_; } | |
62 | |
63 // This iterates of the data elements and segments the 'bytes' data into | |
64 // the smallest number of segments given the max_segment_size. | |
65 // The callback describes either: | |
66 // * A non-memory item | |
67 // * A partition of a bytes element which will be populated into a given | |
68 // segment and segment offset. | |
69 // The function signature of the template functor is: | |
70 // void(DataElement::Type /*element_type*/, | |
71 // size_t /*element_index*/, | |
72 // SizeType /*element_offset*/, | |
73 // size_t /*segment_index*/, | |
74 // SizeType /*segment_offset*/, | |
75 // SizeType /*size*/) | |
kinuko
2015/04/30 15:04:21
would be nice to have a rough explanation about 'e
dmurph
2015/05/07 02:07:39
Done.
| |
76 // | |
77 // Assumptions: All memory items are consolidated. As in, there are no two | |
78 // 'bytes' items next to eachother. | |
79 template <typename ForEachFunctor, typename SizeType> | |
80 static void ForEachWithSegment(const std::vector<DataElement> items, | |
kinuko
2015/04/30 15:04:21
nit: const ref
kinuko
2015/04/30 15:04:21
This could be private?
dmurph
2015/05/07 02:07:39
Done, done.
| |
81 SizeType max_segment_size, | |
82 ForEachFunctor function); | |
83 | |
84 private: | |
85 Error error_; | |
86 | |
87 std::vector<uint64_t> file_handles_; | |
88 // can be size_t, but same as file handles so we can use the same methods. | |
kinuko
2015/04/30 15:04:21
?
dmurph
2015/05/07 02:07:39
Whoops, forgot to remove this.
| |
89 std::vector<size_t> shared_memory_handles_; | |
90 | |
91 std::vector<MemoryItemRequest> requests_; | |
92 | |
93 DISALLOW_COPY_AND_ASSIGN(BlobTransportStrategy); | |
94 }; | |
95 | |
96 } // namespace storage | |
97 | |
98 #endif // STORAGE_BROWSER_BLOB_BLOB_TRANSPORT_STRATEGY_H_ | |
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