Library: Foundation
Package: Cache
Header: Poco/ExpireStrategy.h
Description
An ExpireStrategy implements time based expiration of cache entries
Inheritance
Direct Base Classes: AbstractStrategy < TKey, TValue >
All Base Classes: AbstractStrategy < TKey, TValue >
Member Summary
Member Functions: onAdd, onClear, onGet, onIsValid, onRemove, onReplace
Types Aliases
ConstIndexIterator
using ConstIndexIterator = typename TimeIndex::const_iterator;
IndexIterator
using IndexIterator = typename TimeIndex::iterator;
Iterator
using Iterator = typename Keys::iterator;
Keys
using Keys = std::map < TKey, IndexIterator >;
TimeIndex
using TimeIndex = std::multimap < Timestamp, TKey >;
Constructors
ExpireStrategy 
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.
Destructor
~ExpireStrategy
~ExpireStrategy() = default;
Member Functions
onAdd
void onAdd(
const void * param254,
const KeyValueArgs < TKey, TValue > & args
);
onClear
void onClear(
const void * param257,
const EventArgs & args
);
onGet
void onGet(
const void * param256,
const TKey & key
);
onIsValid
void onIsValid(
const void * param258,
ValidArgs < TKey > & args
);
onRemove
void onRemove(
const void * param255,
const TKey & key
);
onReplace
void onReplace(
const void * param259,
std::set < TKey > & elemsToRemove
);
Variables
_expireTime 
Timestamp::TimeDiff _expireTime;
_keyIndex
TimeIndex _keyIndex;
Maps time to key value
_keys
Keys _keys;
For faster replacement of keys, the iterator points to the _keyIndex map