onion-wownero-blockchain-ex.../ext/vpetrigocaches/fifo_cache_policy.hpp

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#ifndef FIFO_CACHE_POLICY_HPP
#define FIFO_CACHE_POLICY_HPP
#include <list>
#include "cache_policy.hpp"
namespace caches
{
template <typename Key>
class FIFOCachePolicy : public ICachePolicy<Key>
{
public:
FIFOCachePolicy() = default;
~FIFOCachePolicy() = default;
void Insert(const Key& key) override
{
fifo_queue.emplace_front(key);
}
// handle request to the key-element in a cache
void Touch(const Key& key) override
{
// nothing to do here in the FIFO strategy
}
// handle element deletion from a cache
void Erase(const Key& key) override
{
fifo_queue.pop_back();
}
// return a key of a replacement candidate
const Key& ReplCandidate() const override
{
return fifo_queue.back();
}
// return a key of a displacement candidate
void Clear() override
{
fifo_queue.clear();
}
private:
std::list<Key> fifo_queue;
};
} // namespace caches
#endif // FIFO_CACHE_POLICY_HPP