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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
25class QString;
26class QByteArray;
27
58class KDECORE_EXPORT KSharedDataCache
59{
60public:
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
217private:
218 class Private;
219 Private *d;
220};
221
222#endif
KSharedDataCache
A simple data cache which uses shared memory to quickly access data stored on disk.
Definition: kshareddatacache.h:59
KSharedDataCache::EvictionPolicy
EvictionPolicy
Definition: kshareddatacache.h:84
KSharedDataCache::EvictLeastOftenUsed
@ EvictLeastOftenUsed
Definition: kshareddatacache.h:89
KSharedDataCache::EvictLeastRecentlyUsed
@ EvictLeastRecentlyUsed
Definition: kshareddatacache.h:88
QString
kdecore_export.h
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