1 | // |
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2 | // UniqueAccessExpireLRUCache.h |
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3 | // |
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4 | // $Id: //poco/1.3/Foundation/include/Poco/UniqueAccessExpireLRUCache.h#1 $ |
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5 | // |
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6 | // Library: Foundation |
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7 | // Package: Cache |
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8 | // Module: UniqueAccessExpireLRUCache |
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9 | // |
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10 | // Definition of the UniqueAccessExpireLRUCache class. |
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11 | // |
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12 | // Copyright (c) 2006, Applied Informatics Software Engineering GmbH. |
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13 | // and Contributors. |
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14 | // |
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15 | // Permission is hereby granted, free of charge, to any person or organization |
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16 | // obtaining a copy of the software and accompanying documentation covered by |
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17 | // this license (the "Software") to use, reproduce, display, distribute, |
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18 | // execute, and transmit the Software, and to prepare derivative works of the |
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19 | // Software, and to permit third-parties to whom the Software is furnished to |
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20 | // do so, all subject to the following: |
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21 | // |
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22 | // The copyright notices in the Software and this entire statement, including |
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23 | // the above license grant, this restriction and the following disclaimer, |
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24 | // must be included in all copies of the Software, in whole or in part, and |
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25 | // all derivative works of the Software, unless such copies or derivative |
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26 | // works are solely in the form of machine-executable object code generated by |
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27 | // a source language processor. |
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28 | // |
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29 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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30 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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31 | // FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT |
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32 | // SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE |
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33 | // FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, |
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34 | // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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35 | // DEALINGS IN THE SOFTWARE. |
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36 | // |
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37 | |
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38 | |
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39 | #ifndef Foundation_UniqueAccessExpireLRUCache_INCLUDED |
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40 | #define Foundation_UniqueAccessExpireLRUCache_INCLUDED |
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41 | |
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42 | |
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43 | #include "Poco/AbstractCache.h" |
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44 | #include "Poco/StrategyCollection.h" |
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45 | #include "Poco/UniqueAccessExpireStrategy.h" |
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46 | #include "Poco/LRUStrategy.h" |
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47 | |
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48 | |
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49 | namespace Poco { |
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50 | |
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51 | |
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52 | template < |
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53 | class TKey, |
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54 | class TValue |
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55 | > |
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56 | class UniqueAccessExpireLRUCache: public AbstractCache<TKey, TValue, StrategyCollection<TKey, TValue> > |
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57 | /// A UniqueAccessExpireLRUCache combines LRU caching and time based per entry expire caching. |
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58 | /// One can define for each cache entry a seperate timepoint |
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59 | /// but also limit the size of the cache (per default: 1024). |
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60 | /// Each TValue object must thus offer the following method: |
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61 | /// |
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62 | /// const Poco::Timespan& getTimeout() const; |
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63 | /// |
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64 | /// which returns the relative timespan for how long the entry should be valid without being accessed! |
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65 | /// The absolute expire timepoint is calculated as now() + getTimeout(). |
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66 | /// Accessing an object will update this absolute expire timepoint. |
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67 | /// You can use the Poco::AccessExpirationDecorator to add the getExpiration |
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68 | /// method to values that do not have a getExpiration function. |
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69 | { |
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70 | public: |
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71 | UniqueAccessExpireLRUCache(long cacheSize = 1024): |
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72 | AbstractCache<TKey, TValue, StrategyCollection<TKey, TValue> >(StrategyCollection<TKey, TValue>()) |
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73 | { |
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74 | this->_strategy.pushBack(new LRUStrategy<TKey, TValue>(cacheSize)); |
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75 | this->_strategy.pushBack(new UniqueAccessExpireStrategy<TKey, TValue>()); |
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76 | } |
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77 | |
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78 | ~UniqueAccessExpireLRUCache() |
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79 | { |
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80 | } |
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81 | |
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82 | private: |
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83 | UniqueAccessExpireLRUCache(const UniqueAccessExpireLRUCache& aCache); |
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84 | UniqueAccessExpireLRUCache& operator = (const UniqueAccessExpireLRUCache& aCache); |
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85 | }; |
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86 | |
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87 | |
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88 | } // namespace Poco |
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89 | |
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90 | |
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91 | #endif // Foundation_UniqueAccessExpireLRUCache_INCLUDED |
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