1//
2// UniqueExpireLRUCache.h
3//
4// Library: Foundation
5// Package: Cache
6// Module: UniqueExpireLRUCache
7//
8// Definition of the UniqueExpireLRUCache class.
9//
10// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
11// and Contributors.
12//
13// SPDX-License-Identifier: BSL-1.0
14//
15
16
17#ifndef Foundation_UniqueExpireLRUCache_INCLUDED
18#define Foundation_UniqueExpireLRUCache_INCLUDED
19
20
21#include "Poco/AbstractCache.h"
22#include "Poco/StrategyCollection.h"
23#include "Poco/UniqueExpireStrategy.h"
24#include "Poco/LRUStrategy.h"
25
26
27namespace Poco {
28
29
30template <
31 class TKey,
32 class TValue,
33 class TMutex = FastMutex,
34 class TEventMutex = FastMutex
35>
36class UniqueExpireLRUCache: public AbstractCache<TKey, TValue, StrategyCollection<TKey, TValue>, TMutex, TEventMutex>
37 /// A UniqueExpireLRUCache combines LRU caching and time based per entry expire caching.
38 /// One can define for each cache entry a separate timepoint
39 /// but also limit the size of the cache (per default: 1024).
40 /// Each TValue object must thus offer the following method:
41 ///
42 /// const Poco::Timestamp& getExpiration() const;
43 ///
44 /// which returns the absolute timepoint when the entry will be invalidated.
45 /// Accessing an object will NOT update this absolute expire timepoint.
46 /// You can use the Poco::ExpirationDecorator to add the getExpiration
47 /// method to values that do not have a getExpiration function.
48{
49public:
50 UniqueExpireLRUCache(std::size_t cacheSize = 1024):
51 AbstractCache<TKey, TValue, StrategyCollection<TKey, TValue>, TMutex, TEventMutex>(StrategyCollection<TKey, TValue>())
52 {
53 this->_strategy.pushBack(new LRUStrategy<TKey, TValue>(cacheSize));
54 this->_strategy.pushBack(new UniqueExpireStrategy<TKey, TValue>());
55 }
56
57 ~UniqueExpireLRUCache()
58 {
59 }
60
61private:
62 UniqueExpireLRUCache(const UniqueExpireLRUCache& aCache);
63 UniqueExpireLRUCache& operator = (const UniqueExpireLRUCache& aCache);
64};
65
66
67} // namespace Poco
68
69
70#endif // Foundation_UniqueExpireLRUCache_INCLUDED
71