randomizer_cache.hpp

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/*
SeComLib
Copyright 2012-2013 TU Delft, Information Security & Privacy Lab (http://isplab.tudelft.nl/)

Contributors:
Inald Lagendijk (R.L.Lagendijk@TUDelft.nl)
Mihai Todor (todormihai@gmail.com)
Thijs Veugen (P.J.M.Veugen@tudelft.nl)
Zekeriya Erkin (z.erkin@tudelft.nl)

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#ifndef RANDOMIZER_CACHE_IMPLEMENTATION_GUARD
#define RANDOMIZER_CACHE_IMPLEMENTATION_GUARD

namespace SeComLib {
namespace Core {
    template <typename T_Container>
    RandomizerCache<T_Container>::RandomizerCache (const typename T_Container::CryptoProvider &cryptoProvider, const std::string &configurationPath) :
        cryptoProvider(cryptoProvider),
        parameters(configurationPath),
        index(0) {
        this->initialize();
    }

    template <typename T_Container>
    RandomizerCache<T_Container>::RandomizerCache (const typename T_Container::CryptoProvider &cryptoProvider, const typename T_Container::Parameters &parameters) :
        cryptoProvider(cryptoProvider),
        parameters(parameters),
        index(0) {
        this->initialize();
    }

    template <typename T_Container>
    const T_Container &RandomizerCache<T_Container>::Pop () {
        size_t currentIndex = this->index;
        
        ++this->index;
        //wrap the index around once the cache is exhausted
        this->index %= this->parameters.capacity;

        return this->cache[currentIndex];
    }

    template <typename T_Container>
    void RandomizerCache<T_Container>::initialize () {
        this->cache.reserve(this->parameters.capacity);

        for (size_t i = 0; i < this->parameters.capacity; ++i) {
            this->cache.emplace_back(T_Container(this->cryptoProvider, this->parameters));
        }
    }
}//namespace Core
}//namespace SeComLib

#endif//RANDOMIZER_CACHE_IMPLEMENTATION_GUARD