QxOrm  1.4.5
C++ Object Relational Mapping library

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 >
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.

Detailed Description

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