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kshareddatacache.h
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1 /*
2  * This file is part of the KDE project.
3  * Copyright © 2010 Michael Pyne <mpyne@kde.org>
4  *
5  * This library is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Library General Public
7  * License version 2 as published by the Free Software Foundation.
8  *
9  * This library is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Library General Public License for more details.
13  *
14  * You should have received a copy of the GNU Library General Public License
15  * along with this library; see the file COPYING.LIB. If not, write to
16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17  * Boston, MA 02110-1301, USA.
18  */
19 
20 #ifndef KSHAREDDATACACHE_H
21 #define KSHAREDDATACACHE_H
22 
23 #include <kdecore_export.h>
24 
25 class QString;
26 class QByteArray;
27 
58 class KDECORE_EXPORT KSharedDataCache
59 {
60 public:
78  KSharedDataCache(const QString &cacheName,
79  unsigned defaultCacheSize,
80  unsigned expectedItemSize = 0);
81  ~KSharedDataCache();
82 
83  enum EvictionPolicy
84  {
85  // The default value for data in our shared memory will be 0, so it is
86  // important that whatever we want for the default value is also 0.
87  NoEvictionPreference = 0,
88  EvictLeastRecentlyUsed,
89  EvictLeastOftenUsed,
90  EvictOldest
91  };
92 
97  EvictionPolicy evictionPolicy() const;
98 
105  void setEvictionPolicy(EvictionPolicy newPolicy);
106 
114  bool insert(const QString &key, const QByteArray &data);
115 
132  bool find(const QString &key, QByteArray *destination) const;
133 
137  void clear();
138 
146  static void deleteCache(const QString &cacheName);
147 
156  bool contains(const QString &key) const;
157 
163  unsigned totalSize() const;
164 
171  unsigned freeSize() const;
172 
182  unsigned timestamp() const;
183 
215  void setTimestamp(unsigned newTimestamp);
216 
217 private:
218  class Private;
219  Private *d;
220 };
221 
222 #endif
kdecore_export.h
KSharedDataCache::EvictionPolicy
EvictionPolicy
Definition: kshareddatacache.h:83
KSharedDataCache::EvictLeastRecentlyUsed
Definition: kshareddatacache.h:88
QString
KSharedDataCache
A simple data cache which uses shared memory to quickly access data stored on disk.
Definition: kshareddatacache.h:58
KSharedDataCache::EvictLeastOftenUsed
Definition: kshareddatacache.h:89
This file is part of the KDE documentation.
Documentation copyright © 1996-2014 The KDE developers.
Generated on Tue Oct 14 2014 22:47:09 by doxygen 1.8.7 written by Dimitri van Heesch, © 1997-2006

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