46 lines
1.5 KiB
C
46 lines
1.5 KiB
C
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//
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// Copyright (C) 2014 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#ifndef UPDATE_ENGINE_UPDATE_MANAGER_RANDOM_PROVIDER_H_
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#define UPDATE_ENGINE_UPDATE_MANAGER_RANDOM_PROVIDER_H_
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#include "update_engine/update_manager/provider.h"
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#include "update_engine/update_manager/variable.h"
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namespace chromeos_update_manager {
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// Provider of random values.
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class RandomProvider : public Provider {
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public:
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~RandomProvider() override {}
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// Return a random number every time it is requested. Note that values
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// returned by the variables are cached by the EvaluationContext, so the
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// returned value will be the same during the same policy request. If more
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// random values are needed use a PRNG seeded with this value.
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virtual Variable<uint64_t>* var_seed() = 0;
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protected:
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RandomProvider() {}
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private:
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DISALLOW_COPY_AND_ASSIGN(RandomProvider);
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};
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} // namespace chromeos_update_manager
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#endif // UPDATE_ENGINE_UPDATE_MANAGER_RANDOM_PROVIDER_H_
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