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Side by Side Diff: webkit/browser/dom_storage/dom_storage_namespace.h

Issue 22297005: Move webkit/{browser,common}/dom_storage into content/ (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Created 7 years, 4 months ago
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1 // Copyright (c) 2012 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_BROWSER_DOM_STORAGE_DOM_STORAGE_NAMESPACE_H_
6 #define WEBKIT_BROWSER_DOM_STORAGE_DOM_STORAGE_NAMESPACE_H_
7
8 #include <map>
9
10 #include "base/basictypes.h"
11 #include "base/files/file_path.h"
12 #include "base/memory/ref_counted.h"
13 #include "webkit/browser/webkit_storage_browser_export.h"
14
15 class GURL;
16
17 namespace dom_storage {
18
19 class DomStorageArea;
20 class DomStorageTaskRunner;
21 class SessionStorageDatabase;
22
23 // Container for the set of per-origin Areas.
24 // See class comments for DomStorageContext for a larger overview.
25 class WEBKIT_STORAGE_BROWSER_EXPORT DomStorageNamespace
26 : public base::RefCountedThreadSafe<DomStorageNamespace> {
27 public:
28 // Option for PurgeMemory.
29 enum PurgeOption {
30 // Purge unopened areas only.
31 PURGE_UNOPENED,
32
33 // Purge aggressively, i.e. discard cache even for areas that have
34 // non-zero open count.
35 PURGE_AGGRESSIVE,
36 };
37
38 // Constructor for a LocalStorage namespace with id of 0
39 // and an optional backing directory on disk.
40 DomStorageNamespace(const base::FilePath& directory, // may be empty
41 DomStorageTaskRunner* task_runner);
42
43 // Constructor for a SessionStorage namespace with a non-zero id and an
44 // optional backing on disk via |session_storage_database| (may be NULL).
45 DomStorageNamespace(int64 namespace_id,
46 const std::string& persistent_namespace_id,
47 SessionStorageDatabase* session_storage_database,
48 DomStorageTaskRunner* task_runner);
49
50 int64 namespace_id() const { return namespace_id_; }
51 const std::string& persistent_namespace_id() const {
52 return persistent_namespace_id_;
53 }
54
55 // Returns the storage area for the given origin,
56 // creating instance if needed. Each call to open
57 // must be balanced with a call to CloseStorageArea.
58 DomStorageArea* OpenStorageArea(const GURL& origin);
59 void CloseStorageArea(DomStorageArea* area);
60
61 // Returns the area for |origin| if it's open, otherwise NULL.
62 DomStorageArea* GetOpenStorageArea(const GURL& origin);
63
64 // Creates a clone of |this| namespace including
65 // shallow copies of all contained areas.
66 // Should only be called for session storage namespaces.
67 DomStorageNamespace* Clone(int64 clone_namespace_id,
68 const std::string& clone_persistent_namespace_id);
69
70 void DeleteLocalStorageOrigin(const GURL& origin);
71 void DeleteSessionStorageOrigin(const GURL& origin);
72 void PurgeMemory(PurgeOption purge);
73 void Shutdown();
74
75 unsigned int CountInMemoryAreas() const;
76
77 private:
78 friend class base::RefCountedThreadSafe<DomStorageNamespace>;
79
80 // Struct to hold references to our contained areas and
81 // to keep track of how many tabs have a given area open.
82 struct AreaHolder {
83 scoped_refptr<DomStorageArea> area_;
84 int open_count_;
85 AreaHolder();
86 AreaHolder(DomStorageArea* area, int count);
87 ~AreaHolder();
88 };
89 typedef std::map<GURL, AreaHolder> AreaMap;
90
91 ~DomStorageNamespace();
92
93 // Returns a pointer to the area holder in our map or NULL.
94 AreaHolder* GetAreaHolder(const GURL& origin);
95
96 int64 namespace_id_;
97 std::string persistent_namespace_id_;
98 base::FilePath directory_;
99 AreaMap areas_;
100 scoped_refptr<DomStorageTaskRunner> task_runner_;
101 scoped_refptr<SessionStorageDatabase> session_storage_database_;
102 };
103
104 } // namespace dom_storage
105
106
107 #endif // WEBKIT_BROWSER_DOM_STORAGE_DOM_STORAGE_NAMESPACE_H_
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