include/conn_map.h

#ifndef PROXYSERVER_CONN_MAP_H
#define PROXYSERVER_CONN_MAP_H

#include <iostream>
#include <map>
#include <shared_mutex>
#include <mutex>

template <typename Key, typename Value>
class ConnMap {
public:
    static ConnMap& getInstance() {
        static ConnMap instance; // 在首次使用时创建
        return instance;
    }

    ConnMap(ConnMap const&) = delete;
    void operator=(ConnMap const&) = delete;

    void add(const Key& key, const Value& value) {
        std::unique_lock<std::shared_timed_mutex> lock(mutex_);
        map_[key] = value;
    }

    Value* get(const Key& key) const {
        std::shared_lock<std::shared_timed_mutex> lock(mutex_);
        auto it = map_.find(key);
        if (it != map_.end()) {
            return (Value*)(&(it->second));
        }
        return nullptr;
    }

    void remove(const Key& key) {
        std::unique_lock<std::shared_timed_mutex> lock(mutex_);
        map_.erase(key);
    }

    void clear() {
        std::unique_lock<std::shared_timed_mutex> lock(mutex_);
        map_.clear();
    }

private:
    ConnMap() = default;
    mutable std::shared_timed_mutex mutex_;
    std::map<Key, Value> map_;
};

#endif //PROXYSERVER_CONN_MAP_H