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#ifndef EXPIRINGCACHE_H
#define EXPIRINGCACHE_H
#include <QCache>
#include <QDateTime>
#include <QTimer>
#include <QDebug>
template <class K, class V>
class ExpiringCache : public QCache<K, V>
{
public:
ExpiringCache(int maxCost = 100, int expireMs = 1000);
~ExpiringCache();
bool insert(const K& key, V* object, int cost = 1);
bool contains(const K& key) const;
V* object(const K& key, bool noExpireCheck = false) const;
V* operator[](const K& key) const;
V* take(const K& key);
QList<K> keys() const;
bool remove(const K& key);
int count() const;
void clear();
bool isEmpty() const;
void setExpireTime(int ms);
private:
bool expired(const K& key) const;
mutable QHash<K, qint64> expires;
int expireMs;
};
template <class K, class V>
ExpiringCache<K, V>::ExpiringCache(int maxCost, int expireMs) :
QCache<K, V>(maxCost), expireMs(expireMs)
{
}
template <class K, class V>
ExpiringCache<K, V>::~ExpiringCache()
{
}
template <class K, class V>
bool ExpiringCache<K, V>::insert(const K& key, V* object, int cost)
{
QList<K> keysBefore = QCache<K, V>::keys();
bool result = QCache<K, V>::insert(key, object, cost);
if (!result)
return false;
QList<K> keysAfter = QCache<K, V>::keys();
for (const K& keyBefore : keysBefore)
{
if (!keysAfter.contains(keyBefore))
expires.remove(keyBefore);
}
expires[key] = QDateTime::currentMSecsSinceEpoch() + expireMs;
return true;
}
template <class K, class V>
bool ExpiringCache<K, V>::contains(const K& key) const
{
if (expired(key))
return false;
return QCache<K, V>::contains(key);
}
template <class K, class V>
V* ExpiringCache<K, V>::object(const K& key, bool noExpireCheck) const
{
if (!noExpireCheck && expired(key))
return nullptr;
return QCache<K, V>::object(key);
}
template <class K, class V>
V* ExpiringCache<K, V>::operator[](const K& key) const
{
if (expired(key))
return nullptr;
return QCache<K, V>::operator[](key);
}
template <class K, class V>
V* ExpiringCache<K, V>::take(const K& key)
{
if (expired(key))
return nullptr;
expires.remove(key);
return QCache<K, V>::take(key);
}
template <class K, class V>
QList<K> ExpiringCache<K, V>::keys() const
{
QList<K> keyList;
for (const K& key : QCache<K, V>::keys())
{
if (!expired(key))
keyList << key;
}
return keyList;
}
template <class K, class V>
bool ExpiringCache<K, V>::remove(const K& key)
{
expires.remove(key);
return QCache<K, V>::remove(key);
}
template <class K, class V>
int ExpiringCache<K, V>::count() const
{
return keys().count();
}
template <class K, class V>
void ExpiringCache<K, V>::clear()
{
expires.clear();
QCache<K, V>::clear();
}
template <class K, class V>
bool ExpiringCache<K, V>::isEmpty() const
{
return keys().isEmpty();
}
template <class K, class V>
void ExpiringCache<K, V>::setExpireTime(int ms)
{
expireMs = ms;
}
template <class K, class V>
bool ExpiringCache<K, V>::expired(const K& key) const
{
if (expires.contains(key) && QDateTime::currentMSecsSinceEpoch() > expires[key])
{
expires.remove(key);
return true;
}
return false;
}
#endif // EXPIRINGCACHE_H
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