Library: Foundation
Package: Cache
Header: Poco/AbstractStrategy.h
An AbstractStrategy is the interface for all strategies.
Member Functions: onAdd, onClear, onGet, onIsValid, onRemove, onReplace, onUpdate
virtual ~AbstractStrategy();
virtual void onAdd(
const void * pSender,
const KeyValueArgs < TKey, TValue > & key
) = 0;
Adds the key to the strategy. If for the key already an entry exists, an exception will be thrown.
virtual void onClear(
const void * pSender,
const EventArgs & args
) = 0;
Removes all elements from the cache.
virtual void onGet(
const void * pSender,
const TKey & key
) = 0;
Informs the strategy that a read-access happens to an element.
virtual void onIsValid(
const void * pSender,
ValidArgs < TKey > & key
) = 0;
Used to query if a key is still valid (i.e. cached).
virtual void onRemove(
const void * pSender,
const TKey & key
) = 0;
Removes an entry from the strategy. If the entry is not found the remove is ignored.
virtual void onReplace(
const void * pSender,
std::set < TKey > & elemsToRemove
) = 0;
Used by the Strategy to indicate which elements should be removed from the cache. Note that onReplace does not change the current list of keys. The cache object is reponsible to remove the elements.
virtual void onUpdate(
const void * pSender,
const KeyValueArgs < TKey, TValue > & args
);
Updates an existing entry.