mirror-chatterino2/concurrentmap.h

#ifndef CONCURRENTMAP_H
#define CONCURRENTMAP_H

#include <QMap>
#include <QMutex>
#include <functional>

template <typename TKey, typename TValue>
class ConcurrentMap
{
public:
    ConcurrentMap()
    {
        mutex = new QMutex();
        map = new QMap<TKey, TValue>();
    }

    bool
    tryGet(const TKey &name, TValue &value) const
    {
        mutex->lock();
        auto a = map->find(name);
        if (a == map->end()) {
            mutex->unlock();
            value = NULL;
            return false;
        }
        mutex->unlock();
        value = a.value();
        return true;
    }

    TValue
    getOrAdd(const TKey &name, std::function<TValue()> addLambda)
    {
        mutex->lock();
        auto a = map->find(name);
        if (a == map->end()) {
            TValue value = addLambda();
            map->insert(name, value);
            mutex->unlock();
            return value;
        }
        mutex->unlock();
        return a.value();
    }

    void
    clear()
    {
        mutex->lock();
        map->clear();
        mutex->unlock();
    }

    void
    insert(const TKey &name, const TValue &value)
    {
        mutex->lock();
        map->insert(name, value);
        mutex->unlock();
    }

private:
    QMutex *mutex;
    QMap<TKey, TValue> *map;
};

#endif  // CONCURRENTMAP_H