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Side by Side Diff: webkit/blob/blob_storage_context.h

Issue 15746017: Move webkit/blob to new locations. (Closed) Base URL: svn://chrome-svn/chrome/trunk/src/
Patch Set: Created 7 years, 6 months ago
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1 // Copyright (c) 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 WEBKIT_BLOB_BLOB_STORAGE_CONTEXT_H_
6 #define WEBKIT_BLOB_BLOB_STORAGE_CONTEXT_H_
7
8 #include <map>
9 #include <string>
10
11 #include "base/memory/ref_counted.h"
12 #include "base/memory/scoped_ptr.h"
13 #include "base/memory/weak_ptr.h"
14 #include "webkit/blob/blob_data.h"
15 #include "webkit/storage/webkit_storage_export.h"
16
17 class GURL;
18
19 namespace base {
20 class FilePath;
21 class Time;
22 }
23
24 namespace webkit_blob {
25
26 class BlobDataHandle;
27
28 // This class handles the logistics of blob Storage within the browser process,
29 // and maintains a mapping from blob uuid to the data. The class is single
30 // threaded and should only be used on the IO thread.
31 // In chromium, there is one instance per profile.
32 class WEBKIT_STORAGE_EXPORT BlobStorageContext
33 : public base::SupportsWeakPtr<BlobStorageContext> {
34 public:
35 BlobStorageContext();
36 ~BlobStorageContext();
37
38 scoped_ptr<BlobDataHandle> GetBlobDataFromUUID(const std::string& uuid);
39 scoped_ptr<BlobDataHandle> GetBlobDataFromPublicURL(const GURL& url);
40
41 // Useful for coining blobs from within the browser process. If the
42 // blob cannot be added due to memory consumption, returns NULL.
43 scoped_ptr<BlobDataHandle> AddFinishedBlob(const BlobData* blob_data);
44
45 private:
46 friend class BlobDataHandle;
47 friend class BlobStorageHost;
48
49 enum EntryFlags {
50 BEING_BUILT = 1 << 0,
51 EXCEEDED_MEMORY = 1 << 1,
52 };
53
54 struct BlobMapEntry {
55 int refcount;
56 int flags;
57 scoped_refptr<BlobData> data;
58
59 BlobMapEntry();
60 BlobMapEntry(int refcount, int flags, BlobData* data);
61 ~BlobMapEntry();
62 };
63
64 typedef std::map<std::string, BlobMapEntry>
65 BlobMap;
66 typedef std::map<GURL, std::string> BlobURLMap;
67
68 void StartBuildingBlob(const std::string& uuid);
69 void AppendBlobDataItem(const std::string& uuid,
70 const BlobData::Item& data_item);
71 void FinishBuildingBlob(const std::string& uuid, const std::string& type);
72 void CancelBuildingBlob(const std::string& uuid);
73 void IncrementBlobRefCount(const std::string& uuid);
74 void DecrementBlobRefCount(const std::string& uuid);
75 void RegisterPublicBlobURL(const GURL& url, const std::string& uuid);
76 void RevokePublicBlobURL(const GURL& url);
77
78 bool ExpandStorageItems(BlobData* target_blob_data,
79 BlobData* src_blob_data,
80 uint64 offset,
81 uint64 length);
82 bool AppendBytesItem(BlobData* target_blob_data,
83 const char* data, int64 length);
84 void AppendFileItem(BlobData* target_blob_data,
85 const base::FilePath& file_path,
86 uint64 offset, uint64 length,
87 const base::Time& expected_modification_time);
88 void AppendFileSystemFileItem(
89 BlobData* target_blob_data,
90 const GURL& url, uint64 offset, uint64 length,
91 const base::Time& expected_modification_time);
92
93 bool IsInUse(const std::string& uuid);
94 bool IsBeingBuilt(const std::string& uuid);
95 bool IsUrlRegistered(const GURL& blob_url);
96
97 BlobMap blob_map_;
98 BlobURLMap public_blob_urls_;
99
100 // Used to keep track of how much memory is being utitlized for blob data,
101 // we count only the items of TYPE_DATA which are held in memory and not
102 // items of TYPE_FILE.
103 int64 memory_usage_;
104
105 DISALLOW_COPY_AND_ASSIGN(BlobStorageContext);
106 };
107
108 } // namespace webkit_blob
109
110 #endif // WEBKIT_BLOB_BLOB_STORAGE_CONTEXT_H_
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