qx::cache Namespace Reference

Provide basic thread-safe cache feature to backup and restore any kind of objects (for example, object fetched from database) More...

Namespaces
namespace	detail
	Internal helper tools for qx::cache namespace.
Functions
void	max_cost (long l)
	Set the maximum allowed total cost of the cache to l. If the current total cost is greater than l, some objects are deleted immediately.
long	max_cost ()
	Return the maximum allowed total cost of the cache.
long	current_cost ()
	Return the current cost used by the cache.
long	count ()
	Return the number of objects in the cache.
bool	is_empty ()
	Return true if the cache contains no object; otherwise return false.
void	clear ()
	Delete all the objects in the cache.
bool	exist (const QString &sKey)
	Return true if the cache contains an object associated with key sKey; otherwise return false.
bool	remove (const QString &sKey)
	Delete the object associated with key sKey. Return true if the object was found in the cache; otherwise return false.
template<typename T >
bool	set (const QString &sKey, T &t, long lCost=1, const QDateTime &dt=QDateTime())
	Insert object t into the cache with key sKey, associated cost lCost and insertion date-time dt. Any object with the same key already in the cache will be removed.
template<typename T >
T	get (const QString &sKey)
	Return the object of type T associated with key sKey, or return default instance of T() if the key does not exist in the cache.
template<typename T >
qx_bool	get (const QString &sKey, T &t, QDateTime &dt)
	Return true if object t can be fetched with associated key sKey and insertion date-time dt; otherwise return false with an error description.
template<typename T >
qx_bool	get (const QString &sKey, T &t)
	Return true if object t can be fetched with associated key sKey; otherwise return false with an error description.

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Detailed Description

Provide basic thread-safe cache feature to backup and restore any kind of objects (for example, object fetched from database)