File Information
Library: Foundation
Package: Cache
Header: Poco/AbstractStrategy.h
Description
An AbstractStrategy is the interface for all strategies.
Member Summary
Member Functions: onAdd, onClear, onGet, onIsValid, onRemove, onReplace, onUpdate
Constructors
AbstractStrategy 
Destructor
~AbstractStrategy 
virtual ~AbstractStrategy();
Member Functions
onAdd
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.
onClear
virtual void onClear(
const void * pSender,
const EventArgs & args
) = 0;
Removes all elements from the cache.
onGet
virtual void onGet(
const void * pSender,
const TKey & key
) = 0;
Informs the strategy that a read-access happens to an element.
onIsValid
virtual void onIsValid(
const void * pSender,
ValidArgs < TKey > & key
) = 0;
Used to query if a key is still valid (i.e. cached).
onRemove
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.
onReplace
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 responsible to remove the elements.
onUpdate
virtual void onUpdate(
const void * pSender,
const KeyValueArgs < TKey, TValue > & args
);
Updates an existing entry.