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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #ifndef COMPONENTS_VARIATIONS_CACHING_PERMUTED_ENTROPY_PROVIDER_H_ | 5 #ifndef COMPONENTS_VARIATIONS_CACHING_PERMUTED_ENTROPY_PROVIDER_H_ |
| 6 #define COMPONENTS_VARIATIONS_CACHING_PERMUTED_ENTROPY_PROVIDER_H_ | 6 #define COMPONENTS_VARIATIONS_CACHING_PERMUTED_ENTROPY_PROVIDER_H_ |
| 7 | 7 |
| 8 #include "base/basictypes.h" | 8 #include "base/basictypes.h" |
| 9 #include "base/compiler_specific.h" | 9 #include "base/compiler_specific.h" |
| 10 #include "base/threading/thread_checker.h" | 10 #include "base/threading/thread_checker.h" |
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| 31 | 31 |
| 32 // Registers pref keys used by this class in the Local State pref registry. | 32 // Registers pref keys used by this class in the Local State pref registry. |
| 33 static void RegisterPrefs(PrefRegistrySimple* registry); | 33 static void RegisterPrefs(PrefRegistrySimple* registry); |
| 34 | 34 |
| 35 // Clears the cache in local state. Should be called when the low entropy | 35 // Clears the cache in local state. Should be called when the low entropy |
| 36 // source value gets reset. | 36 // source value gets reset. |
| 37 static void ClearCache(PrefService* local_state); | 37 static void ClearCache(PrefService* local_state); |
| 38 | 38 |
| 39 private: | 39 private: |
| 40 // PermutedEntropyProvider overrides: | 40 // PermutedEntropyProvider overrides: |
| 41 virtual uint16 GetPermutedValue(uint32 randomization_seed) const OVERRIDE; | 41 virtual uint16 GetPermutedValue(uint32 randomization_seed) const override; |
| 42 | 42 |
| 43 // Reads the cache from local state. | 43 // Reads the cache from local state. |
| 44 void ReadFromLocalState() const; | 44 void ReadFromLocalState() const; |
| 45 | 45 |
| 46 // Updates local state with the state of the cache. | 46 // Updates local state with the state of the cache. |
| 47 void UpdateLocalState() const; | 47 void UpdateLocalState() const; |
| 48 | 48 |
| 49 // Adds |randomization_seed| -> |value| to the cache. | 49 // Adds |randomization_seed| -> |value| to the cache. |
| 50 void AddToCache(uint32 randomization_seed, uint16 value) const; | 50 void AddToCache(uint32 randomization_seed, uint16 value) const; |
| 51 | 51 |
| 52 // Finds the value corresponding to |randomization_seed|, setting |value| and | 52 // Finds the value corresponding to |randomization_seed|, setting |value| and |
| 53 // returning true if found. | 53 // returning true if found. |
| 54 bool FindValue(uint32 randomization_seed, uint16* value) const; | 54 bool FindValue(uint32 randomization_seed, uint16* value) const; |
| 55 | 55 |
| 56 base::ThreadChecker thread_checker_; | 56 base::ThreadChecker thread_checker_; |
| 57 PrefService* local_state_; | 57 PrefService* local_state_; |
| 58 mutable PermutedEntropyCache cache_; | 58 mutable PermutedEntropyCache cache_; |
| 59 | 59 |
| 60 DISALLOW_COPY_AND_ASSIGN(CachingPermutedEntropyProvider); | 60 DISALLOW_COPY_AND_ASSIGN(CachingPermutedEntropyProvider); |
| 61 }; | 61 }; |
| 62 | 62 |
| 63 } // namespace metrics | 63 } // namespace metrics |
| 64 | 64 |
| 65 #endif // COMPONENTS_VARIATIONS_CACHING_PERMUTED_ENTROPY_PROVIDER_H_ | 65 #endif // COMPONENTS_VARIATIONS_CACHING_PERMUTED_ENTROPY_PROVIDER_H_ |
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