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78 lines
1.3 KiB
78 lines
1.3 KiB
#ifndef CACHE_POLICY_HPP
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#define CACHE_POLICY_HPP
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#include <unordered_set>
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namespace caches
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{
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template <typename Key>
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class ICachePolicy
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{
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public:
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virtual ~ICachePolicy() {}
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// handle element insertion in a cache
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virtual void Insert(const Key& key) = 0;
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// handle request to the key-element in a cache
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virtual void Touch(const Key& key) = 0;
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// handle element deletion from a cache
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virtual void Erase(const Key& key) = 0;
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// return a key of a replacement candidate
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virtual const Key& ReplCandidate() const = 0;
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// clear the cache
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virtual void Clear() = 0;
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};
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template <typename Key>
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class NoCachePolicy : public ICachePolicy<Key>
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{
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public:
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NoCachePolicy() = default;
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~NoCachePolicy() override = default;
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void Insert(const Key& key) override
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{
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key_storage.emplace(key);
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}
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void Touch(const Key& key) override
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{
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// do not do anything
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}
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void Erase(const Key& key) override
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{
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key_storage.erase(key);
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}
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// return a key of a displacement candidate
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const Key& ReplCandidate() const override
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{
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return *key_storage.crbegin();
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}
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// return a key of a displacement candidate
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void Clear() override
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{
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key_storage.clear();
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}
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private:
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std::unordered_set<Key> key_storage;
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};
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} // namespace caches
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#endif // CACHE_POLICY_HPP
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