topical media & game development
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lib-of-vs-libs-Poco-include-Poco-AccessExpireCache.h / h



  //
  // AccessExpireCache.h
  //
  // Id: //poco/1.3/Foundation/include/Poco/AccessExpireCache.h#1 
  //
  // Library: Foundation
  // Package: Cache
  // Module:  AccessExpireCache
  //
  // Definition of the AccessExpireCache class.
  //
  // Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
  // and Contributors.
  //
  // Permission is hereby granted, free of charge, to any person or organization
  // obtaining a copy of the software and accompanying documentation covered by
  // this license (the "Software") to use, reproduce, display, distribute,
  // execute, and transmit the Software, and to prepare derivative works of the
  // Software, and to permit third-parties to whom the Software is furnished to
  // do so, all subject to the following:
  // 
  // The copyright notices in the Software and this entire statement, including
  // the above license grant, this restriction and the following disclaimer,
  // must be included in all copies of the Software, in whole or in part, and
  // all derivative works of the Software, unless such copies or derivative
  // works are solely in the form of machine-executable object code generated by
  // a source language processor.
  // 
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
  // SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
  // FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
  // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  // DEALINGS IN THE SOFTWARE.
  //
  
  ifndef  Foundation_AccessExpireCache_INCLUDED
  define  Foundation_AccessExpireCache_INCLUDED
  
  include "Poco/AbstractCache.h"
  include "Poco/AccessExpireStrategy.h"
  
  namespace Poco {
  
  template <class TKey, class TValue> 
  class AccessExpireCache: public AbstractCache<TKey, TValue, AccessExpireStrategy<TKey, TValue> >
An AccessExpireCache caches entries for a fixed time period (per default 10 minutes). Entries expire when they are not accessed with get() during this time period. Each access resets the start time for expiration. Be careful when using an AccessExpireCache. A cache is often used like cache.has(x) followed by cache.get x). Note that it could happen that the "has" call works, then the current execution thread gets descheduled, time passes, the entry gets invalid, thus leading to an empty SharedPtr being returned when "get" is invoked. { public: AccessExpireCache(Timestamp::TimeDiff expire = 600000): AbstractCache<TKey, TValue, AccessExpireStrategy<TKey, TValue> >(AccessExpireStrategy<TKey, TValue>(expire)) { } 

          ~AccessExpireCache()
          {
          }
  
  private:
          AccessExpireCache(const AccessExpireCache& aCache);
          AccessExpireCache& operator = (const AccessExpireCache& aCache);
  };
  
  } // namespace Poco
  
  endif // Foundation_AccessExpireCache_INCLUDED
[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

(C) Æliens 04/09/2009

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