mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-15 03:53:41 +00:00
b79ead9c84
* Replicate poco into base/poco/ * De-register poco submodule * Build poco from ClickHouse * Exclude poco from stylecheck * Exclude poco from whitespace check * Exclude poco from typo check * Remove x bit from sources/headers (the style check complained) * Exclude poco from duplicate include check * Fix fasttest * Remove contrib/poco-cmake/* * Simplify poco build descriptions * Remove poco stuff not used by ClickHouse * Glob poco sources * Exclude poco from clang-tidy
75 lines
1.7 KiB
C++
75 lines
1.7 KiB
C++
//
|
|
// AccessExpireStrategy.h
|
|
//
|
|
// Library: Foundation
|
|
// Package: Cache
|
|
// Module: AccessExpireStrategy
|
|
//
|
|
// Definition of the AccessExpireStrategy class.
|
|
//
|
|
// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
|
|
// and Contributors.
|
|
//
|
|
// SPDX-License-Identifier: BSL-1.0
|
|
//
|
|
|
|
|
|
#ifndef Foundation_AccessExpireStrategy_INCLUDED
|
|
#define Foundation_AccessExpireStrategy_INCLUDED
|
|
|
|
|
|
#include "Poco/KeyValueArgs.h"
|
|
#include "Poco/ValidArgs.h"
|
|
#include "Poco/ExpireStrategy.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 AccessExpireStrategy: public ExpireStrategy<TKey, TValue>
|
|
/// An AccessExpireStrategy implements time and access based expiration of cache entries
|
|
{
|
|
public:
|
|
AccessExpireStrategy(Timestamp::TimeDiff expireTimeInMilliSec): ExpireStrategy<TKey, TValue>(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.
|
|
{
|
|
}
|
|
|
|
~AccessExpireStrategy()
|
|
{
|
|
}
|
|
|
|
void onGet(const void*, const TKey& key)
|
|
{
|
|
// get triggers an update to the expiration time
|
|
typename ExpireStrategy<TKey, TValue>::Iterator it = this->_keys.find(key);
|
|
if (it != this->_keys.end())
|
|
{
|
|
if (!it->second->first.isElapsed(this->_expireTime)) // don't extend if already expired
|
|
{
|
|
this->_keyIndex.erase(it->second);
|
|
Timestamp now;
|
|
typename ExpireStrategy<TKey, TValue>::IndexIterator itIdx =
|
|
this->_keyIndex.insert(typename ExpireStrategy<TKey, TValue>::TimeIndex::value_type(now, key));
|
|
it->second = itIdx;
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
|
|
} // namespace Poco
|
|
|
|
|
|
#endif // Foundation_AccessExpireStrategy_INCLUDED
|