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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 CHROME_BROWSER_EXTENSIONS_SETTINGS_SETTINGS_STORAGE_QUOTA_ENFORCER_H_ | |
6 #define CHROME_BROWSER_EXTENSIONS_SETTINGS_SETTINGS_STORAGE_QUOTA_ENFORCER_H_ | |
7 | |
8 #include "base/compiler_specific.h" | |
9 #include "base/memory/weak_ptr.h" | |
10 #include "chrome/browser/value_store/value_store.h" | |
11 | |
12 namespace extensions { | |
13 | |
14 // Enforces total quota and a per-setting quota in bytes, and a maximum number | |
15 // of setting keys, for a delegate storage area. | |
16 class SettingsStorageQuotaEnforcer : public ValueStore { | |
17 public: | |
18 struct Limits { | |
19 // The total quota in bytes. | |
20 size_t quota_bytes; | |
21 | |
22 // The quota for each individual item in bytes. | |
23 size_t quota_bytes_per_item; | |
24 | |
25 // The maximum number of items allowed. | |
26 size_t max_items; | |
27 }; | |
28 | |
29 SettingsStorageQuotaEnforcer(const Limits& limits, ValueStore* delegate); | |
30 | |
31 virtual ~SettingsStorageQuotaEnforcer(); | |
32 | |
33 // ValueStore implementation. | |
34 virtual size_t GetBytesInUse(const std::string& key) OVERRIDE; | |
35 virtual size_t GetBytesInUse(const std::vector<std::string>& keys) OVERRIDE; | |
36 virtual size_t GetBytesInUse() OVERRIDE; | |
37 virtual ReadResult Get(const std::string& key) OVERRIDE; | |
38 virtual ReadResult Get(const std::vector<std::string>& keys) OVERRIDE; | |
39 virtual ReadResult Get() OVERRIDE; | |
40 virtual WriteResult Set( | |
41 WriteOptions options, | |
42 const std::string& key, | |
43 const Value& value) OVERRIDE; | |
44 virtual WriteResult Set( | |
45 WriteOptions options, const DictionaryValue& values) OVERRIDE; | |
46 virtual WriteResult Remove(const std::string& key) OVERRIDE; | |
47 virtual WriteResult Remove(const std::vector<std::string>& keys) OVERRIDE; | |
48 virtual WriteResult Clear() OVERRIDE; | |
49 | |
50 private: | |
51 // Limits configuration. | |
52 const Limits limits_; | |
53 | |
54 // The delegate storage area. | |
55 scoped_ptr<ValueStore> const delegate_; | |
56 | |
57 // Total bytes in used by |delegate_|. Includes both key lengths and | |
58 // JSON-encoded values. | |
59 size_t used_total_; | |
60 | |
61 // Map of item key to its size, including the key itself. | |
62 std::map<std::string, size_t> used_per_setting_; | |
63 | |
64 DISALLOW_COPY_AND_ASSIGN(SettingsStorageQuotaEnforcer); | |
65 }; | |
66 | |
67 } // namespace extensions | |
68 | |
69 #endif // CHROME_BROWSER_EXTENSIONS_SETTINGS_SETTINGS_STORAGE_QUOTA_ENFORCER_H_ | |
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