Library: Foundation
Package: Cache
Header: Poco/ExpireStrategy.h
An ExpireStrategy implements time based expiration of cache entries
Direct Base Classes: AbstractStrategy < TKey, TValue >
All Base Classes: AbstractStrategy < TKey, TValue >
Member Functions: onAdd, onClear, onGet, onIsValid, onRemove, onReplace
typedef typename TimeIndex::const_iterator ConstIndexIterator;
typedef typename TimeIndex::iterator IndexIterator;
typedef typename Keys::iterator Iterator;
typedef std::map < TKey, IndexIterator > Keys;
typedef std::multimap < Timestamp, TKey > TimeIndex;
 
 ExpireStrategy(
    Timestamp::TimeDiff expireTimeInMilliSec
);
Create an expire strategy. Note that the smallest allowed caching time is 25ms. Anything lower than that is not useful with current operating systems.
 
 ~ExpireStrategy();
 
 void onAdd(
    const void * param108,
    const KeyValueArgs < TKey,
    TValue > & args
);
 
 void onClear(
    const void * param111,
    const EventArgs & args
);
 
 void onGet(
    const void * param110,
    const TKey & key
);
 
 void onIsValid(
    const void * param112,
    ValidArgs < TKey > & args
);
 
 void onRemove(
    const void * param109,
    const TKey & key
);
 
 void onReplace(
    const void * param113,
    std::set < TKey > & elemsToRemove
);
 
 Timestamp::TimeDiff _expireTime;
 
 TimeIndex _keyIndex;
Maps time to key value
 
 Keys _keys;
For faster replacement of keys, the iterator points to the _keyIndex map