cs.hpp

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#pragma once
 
#include "ndn/common.hpp"
#include "ndn/data.hpp"
 
namespace ndn {
 
constexpr size_t CS_DEFAULT_ENTRIES = 15;
 
constexpr size_t CS_MANET_ENTRIES = 100;
 
constexpr size_t CS_LARGE_MANET_ENTRIES = 200;
 
class CsEntry {
public:
    const Data& data() const { return data_; }
 
    TimeMs staleTime() const { return staleTime_; }
 
    bool isFresh(TimeMs now) const;
 
private:
    friend class ContentStore;
    Data data_;             
    TimeMs staleTime_ = 0;  
    TimeMs lastUsed_ = 0;   
    bool inUse_ = false;    
};
 
class ContentStore {
public:
    ContentStore() = default;
 
    ~ContentStore();
 
    // Copy and move prohibited (due to pointer management)
    ContentStore(const ContentStore&) = delete;
    ContentStore& operator=(const ContentStore&) = delete;
    ContentStore(ContentStore&&) = delete;
    ContentStore& operator=(ContentStore&&) = delete;
 
    Error init(size_t maxEntries = CS_DEFAULT_ENTRIES);
 
    Error insert(const Data& data, TimeMs now);
 
    const CsEntry* find(const Name& name, bool mustBeFresh = false, TimeMs now = 0) const;
 
    void remove(const Name& name);
 
    void evictStale(TimeMs now);
    size_t size() const { return size_; }
 
    size_t capacity() const { return capacity_; }
 
    struct Stats {
        uint32_t hits = 0;        
        uint32_t misses = 0;      
        uint32_t insertions = 0;  
        uint32_t evictions = 0;   
    };
 
    const Stats& stats() const { return stats_; }
private:
    CsEntry* entries_ = nullptr;  
    size_t capacity_ = 0;         
    size_t size_ = 0;             
    Stats stats_{};               
 
    CsEntry* findLruEntry();
};
 
}  // namespace ndn