mirror of
https://github.com/pocoproject/poco.git
synced 2024-12-21 05:03:36 +01:00
b0581433a7
fix: remove executable flag and change back to 100644 (was 100755) Signed-off-by: Roger Meier <r.meier@siemens.com>
135 lines
3.1 KiB
C++
135 lines
3.1 KiB
C++
//
|
|
// ExpireStrategy.h
|
|
//
|
|
// $Id: //poco/1.4/Foundation/include/Poco/ExpireStrategy.h#1 $
|
|
//
|
|
// Library: Foundation
|
|
// Package: Cache
|
|
// Module: ExpireStrategy
|
|
//
|
|
// Definition of the ExpireStrategy class.
|
|
//
|
|
// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
|
|
// and Contributors.
|
|
//
|
|
// SPDX-License-Identifier: BSL-1.0
|
|
//
|
|
|
|
|
|
#ifndef Foundation_ExpireStrategy_INCLUDED
|
|
#define Foundation_ExpireStrategy_INCLUDED
|
|
|
|
|
|
#include "Poco/KeyValueArgs.h"
|
|
#include "Poco/ValidArgs.h"
|
|
#include "Poco/AbstractStrategy.h"
|
|
#include "Poco/Bugcheck.h"
|
|
#include "Poco/Timestamp.h"
|
|
#include "Poco/EventArgs.h"
|
|
#include <set>
|
|
#include <map>
|
|
|
|
|
|
namespace Poco {
|
|
|
|
|
|
template <
|
|
class TKey,
|
|
class TValue
|
|
>
|
|
class ExpireStrategy: public AbstractStrategy<TKey, TValue>
|
|
/// An ExpireStrategy implements time based expiration of cache entries
|
|
{
|
|
public:
|
|
typedef std::multimap<Timestamp, TKey> TimeIndex;
|
|
typedef typename TimeIndex::iterator IndexIterator;
|
|
typedef typename TimeIndex::const_iterator ConstIndexIterator;
|
|
typedef std::map<TKey, IndexIterator> Keys;
|
|
typedef typename Keys::iterator Iterator;
|
|
|
|
public:
|
|
ExpireStrategy(Timestamp::TimeDiff expireTimeInMilliSec): _expireTime(expireTimeInMilliSec * 1000)
|
|
/// Create an expire strategy. Note that the smallest allowed caching time is 25ms.
|
|
/// Anything lower than that is not useful with current operating systems.
|
|
{
|
|
if (_expireTime < 25000) throw InvalidArgumentException("expireTime must be at least 25 ms");
|
|
}
|
|
|
|
~ExpireStrategy()
|
|
{
|
|
}
|
|
|
|
void onAdd(const void*, const KeyValueArgs <TKey, TValue>& args)
|
|
{
|
|
Timestamp now;
|
|
typename TimeIndex::value_type tiValue(now, args.key());
|
|
IndexIterator it = _keyIndex.insert(tiValue);
|
|
typename Keys::value_type kValue(args.key(), it);
|
|
std::pair<Iterator, bool> stat = _keys.insert(kValue);
|
|
if (!stat.second)
|
|
{
|
|
_keyIndex.erase(stat.first->second);
|
|
stat.first->second = it;
|
|
}
|
|
}
|
|
|
|
void onRemove(const void*, const TKey& key)
|
|
{
|
|
Iterator it = _keys.find(key);
|
|
if (it != _keys.end())
|
|
{
|
|
_keyIndex.erase(it->second);
|
|
_keys.erase(it);
|
|
}
|
|
}
|
|
|
|
void onGet(const void*, const TKey& key)
|
|
{
|
|
// get triggers no changes in an expire
|
|
}
|
|
|
|
void onClear(const void*, const EventArgs& args)
|
|
{
|
|
_keys.clear();
|
|
_keyIndex.clear();
|
|
}
|
|
|
|
void onIsValid(const void*, ValidArgs<TKey>& args)
|
|
{
|
|
Iterator it = _keys.find(args.key());
|
|
if (it != _keys.end())
|
|
{
|
|
if (it->second->first.isElapsed(_expireTime))
|
|
{
|
|
args.invalidate();
|
|
}
|
|
}
|
|
else //not found: probably removed by onReplace
|
|
args.invalidate();
|
|
}
|
|
|
|
void onReplace(const void*, std::set<TKey>& elemsToRemove)
|
|
{
|
|
// Note: replace only informs the cache which elements
|
|
// it would like to remove!
|
|
// it does not remove them on its own!
|
|
IndexIterator it = _keyIndex.begin();
|
|
while (it != _keyIndex.end() && it->first.isElapsed(_expireTime))
|
|
{
|
|
elemsToRemove.insert(it->second);
|
|
++it;
|
|
}
|
|
}
|
|
|
|
protected:
|
|
Timestamp::TimeDiff _expireTime;
|
|
Keys _keys; /// For faster replacement of keys, the iterator points to the _keyIndex map
|
|
TimeIndex _keyIndex; /// Maps time to key value
|
|
};
|
|
|
|
|
|
} // namespace Poco
|
|
|
|
|
|
#endif // Foundation_ExpireStrategy_INCLUDED
|