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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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