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86 lines
3.0 KiB
C
86 lines
3.0 KiB
C
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//
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// AccessExpireCache.h
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//
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// $Id: //poco/1.4/Foundation/include/Poco/AccessExpireCache.h#1 $
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//
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// Library: Foundation
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// Package: Cache
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// Module: AccessExpireCache
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//
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// Definition of the AccessExpireCache class.
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//
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// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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#ifndef Foundation_AccessExpireCache_INCLUDED
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#define Foundation_AccessExpireCache_INCLUDED
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#include "Poco/AbstractCache.h"
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#include "Poco/AccessExpireStrategy.h"
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namespace Poco {
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template <
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class TKey,
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class TValue,
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class TMutex = FastMutex,
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class TEventMutex = FastMutex
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>
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class AccessExpireCache: public AbstractCache<TKey, TValue, AccessExpireStrategy<TKey, TValue>, TMutex, TEventMutex>
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/// An AccessExpireCache caches entries for a fixed time period (per default 10 minutes).
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/// Entries expire when they are not accessed with get() during this time period. Each access resets
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/// the start time for expiration.
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/// Be careful when using an AccessExpireCache. A cache is often used
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/// like cache.has(x) followed by cache.get x). Note that it could happen
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/// that the "has" call works, then the current execution thread gets descheduled, time passes,
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/// the entry gets invalid, thus leading to an empty SharedPtr being returned
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/// when "get" is invoked.
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{
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public:
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AccessExpireCache(Timestamp::TimeDiff expire = 600000):
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AbstractCache<TKey, TValue, AccessExpireStrategy<TKey, TValue>, TMutex, TEventMutex>(AccessExpireStrategy<TKey, TValue>(expire))
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{
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}
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~AccessExpireCache()
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{
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}
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private:
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AccessExpireCache(const AccessExpireCache& aCache);
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AccessExpireCache& operator = (const AccessExpireCache& aCache);
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};
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} // namespace Poco
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#endif // Foundation_AccessExpireCache_INCLUDED
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