| 1 | // Copyright (C) 2016 The Qt Company Ltd. |
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| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
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| 3 | |
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| 4 | #ifndef QNETWORKACCESSCACHE_P_H |
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| 5 | #define QNETWORKACCESSCACHE_P_H |
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| 6 | |
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| 7 | // |
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| 8 | // W A R N I N G |
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| 9 | // ------------- |
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| 10 | // |
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| 11 | // This file is not part of the Qt API. It exists for the convenience |
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| 12 | // of the Network Access API. This header file may change from |
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| 13 | // version to version without notice, or even be removed. |
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| 14 | // |
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| 15 | // We mean it. |
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| 16 | // |
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| 17 | |
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| 18 | #include <QtNetwork/private/qtnetworkglobal_p.h> |
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| 19 | #include "QtCore/qobject.h" |
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| 20 | #include "QtCore/qbasictimer.h" |
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| 21 | #include "QtCore/qbytearray.h" |
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| 22 | #include "QtCore/qhash.h" |
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| 23 | #include "QtCore/qmetatype.h" |
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| 24 | |
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| 25 | QT_BEGIN_NAMESPACE |
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| 26 | |
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| 27 | class QNetworkRequest; |
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| 28 | class QUrl; |
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| 29 | |
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| 30 | // this class is not about caching files but about |
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| 31 | // caching objects used by QNetworkAccessManager, e.g. existing TCP connections |
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| 32 | // or credentials. |
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| 33 | class QNetworkAccessCache: public QObject |
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| 34 | { |
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| 35 | Q_OBJECT |
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| 36 | public: |
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| 37 | struct Node; |
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| 38 | typedef QHash<QByteArray, Node *> NodeHash; |
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| 39 | |
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| 40 | class CacheableObject |
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| 41 | { |
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| 42 | friend class QNetworkAccessCache; |
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| 43 | QByteArray key; |
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| 44 | bool expires; |
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| 45 | bool shareable; |
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| 46 | qint64 expiryTimeoutSeconds; |
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| 47 | public: |
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| 48 | CacheableObject(); |
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| 49 | virtual ~CacheableObject(); |
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| 50 | virtual void dispose() = 0; |
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| 51 | inline QByteArray cacheKey() const { return key; } |
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| 52 | |
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| 53 | protected: |
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| 54 | void setExpires(bool enable); |
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| 55 | void setShareable(bool enable); |
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| 56 | }; |
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| 57 | |
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| 58 | ~QNetworkAccessCache(); |
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| 59 | |
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| 60 | void clear(); |
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| 61 | |
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| 62 | void addEntry(const QByteArray &key, CacheableObject *entry, qint64 connectionCacheExpiryTimeoutSeconds = -1); |
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| 63 | bool hasEntry(const QByteArray &key) const; |
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| 64 | CacheableObject *requestEntryNow(const QByteArray &key); |
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| 65 | void releaseEntry(const QByteArray &key); |
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| 66 | void removeEntry(const QByteArray &key); |
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| 67 | |
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| 68 | signals: |
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| 69 | void entryReady(QNetworkAccessCache::CacheableObject *); |
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| 70 | |
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| 71 | protected: |
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| 72 | void timerEvent(QTimerEvent *) override; |
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| 73 | |
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| 74 | private: |
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| 75 | // idea copied from qcache.h |
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| 76 | NodeHash hash; |
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| 77 | Node *firstExpiringNode = nullptr; |
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| 78 | Node *lastExpiringNode = nullptr; |
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| 79 | |
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| 80 | QBasicTimer timer; |
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| 81 | |
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| 82 | void linkEntry(const QByteArray &key); |
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| 83 | bool unlinkEntry(const QByteArray &key); |
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| 84 | void updateTimer(); |
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| 85 | bool emitEntryReady(Node *node, QObject *target, const char *member); |
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| 86 | }; |
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| 87 | |
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| 88 | QT_END_NAMESPACE |
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| 89 | |
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| 90 | #endif |
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| 91 | |
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