Library: Foundation
Package: Cache
Header: Poco/UniqueAccessExpireStrategy.h
Description
An UniqueExpireStrategy implements time based expiration of cache entries. In contrast to ExpireStrategy which only allows to set a per cache expiration value, it allows to define expiration per CacheEntry. Each TValue object must thus offer the following method:
const Poco::Timestamp& getTimeout() const;
which returns the timespan for how long an object will be valid without being accessed.
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;
KeyExpire
using KeyExpire = std::pair < TKey, Timespan >;
Keys
using Keys = std::map < TKey, IndexIterator >;
TimeIndex
using TimeIndex = std::multimap < Timestamp, KeyExpire >;
Constructors
UniqueAccessExpireStrategy
UniqueAccessExpireStrategy() = default;
Create an unique expire strategy.
Destructor
~UniqueAccessExpireStrategy
~UniqueAccessExpireStrategy() = default;
Member Functions
onAdd 
void onAdd(
const void * param411,
const KeyValueArgs < TKey, TValue > & args
);
onClear
void onClear(
const void * param414,
const EventArgs & args
);
onGet
void onGet(
const void * param413,
const TKey & key
);
onIsValid
void onIsValid(
const void * param415,
ValidArgs < TKey > & args
);
onRemove
void onRemove(
const void * param412,
const TKey & key
);
onReplace
void onReplace(
const void * param416,
std::set < TKey > & elemsToRemove
);
Variables
_keyIndex 
TimeIndex _keyIndex;
Maps time to key value
_keys
Keys _keys;
For faster replacement of keys, the iterator points to the _keyIndex map