| // Copyright (c) 2014 The Chromium OS Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef UPDATE_ENGINE_UPDATE_MANAGER_RANDOM_PROVIDER_H_ |
| #define UPDATE_ENGINE_UPDATE_MANAGER_RANDOM_PROVIDER_H_ |
| |
| #include "update_engine/update_manager/provider.h" |
| #include "update_engine/update_manager/variable.h" |
| |
| namespace chromeos_update_manager { |
| |
| // Provider of random values. |
| class RandomProvider : public Provider { |
| public: |
| ~RandomProvider() override {} |
| |
| // Return a random number every time it is requested. Note that values |
| // returned by the variables are cached by the EvaluationContext, so the |
| // returned value will be the same during the same policy request. If more |
| // random values are needed use a PRNG seeded with this value. |
| virtual Variable<uint64_t>* var_seed() = 0; |
| |
| protected: |
| RandomProvider() {} |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(RandomProvider); |
| }; |
| |
| } // namespace chromeos_update_manager |
| |
| #endif // UPDATE_ENGINE_UPDATE_MANAGER_RANDOM_PROVIDER_H_ |