qswiki/cache/mapcache.h

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#ifndef MAPCACHE_H
#define MAPCACHE_H
#include <map>
#include <set>
#include <shared_mutex>
/* Thread-Safe Key-Value store */
template <class T> class MapCache
{
private:
std::map<std::string, T> cache;
mutable std::shared_mutex sharedMutex;
public:
std::optional<T> find(const std::string &key) const
{
std::shared_lock<std::shared_mutex> lock(this->sharedMutex);
auto it = this->cache.find(key);
if(it != this->cache.end())
{
return it->second;
}
return {};
}
void set(const std::string &key, const T &val)
{
std::lock_guard<std::shared_mutex> lock{sharedMutex};
this->cache[key] = val;
}
void clear()
{
std::lock_guard<std::shared_mutex> lock{sharedMutex};
this->cache.clear();
}
};
#endif // MAPCACHE_H