qnetworkdiskcache.cpp

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39 -

40 //#define QNETWORKDISKCACHE_DEBUG -

41 -

42 -

43 #include "qnetworkdiskcache.h" -

44 #include "qnetworkdiskcache_p.h" -

45 #include "QtCore/qscopedpointer.h" -

46 -

47 #include <qfile.h> -

48 #include <qdir.h> -

49 #include <qdatastream.h> -

50 #include <qdatetime.h> -

51 #include <qdiriterator.h> -

52 #include <qurl.h> -

53 #include <qcryptographichash.h> -

54 #include <qdebug.h> -

55 -

56 #define CACHE_POSTFIX QLatin1String(".d") -

57 #define PREPARED_SLASH QLatin1String("prepared/") -

58 #define CACHE_VERSION 8 -

59 #define DATA_DIR QLatin1String("data") -

60 -

61 #define MAX_COMPRESSION_SIZE (1024 * 1024 * 3) -

62 -

63 #ifndef QT_NO_NETWORKDISKCACHE -

64 -

65 QT_BEGIN_NAMESPACE -

66 -

67 /*! -

68 \class QNetworkDiskCache -

69 \since 4.5 -

70 \inmodule QtNetwork -

71 -

72 \brief The QNetworkDiskCache class provides a very basic disk cache. -

73 -

74 QNetworkDiskCache stores each url in its own file inside of the -

75 cacheDirectory using QDataStream. Files with a text MimeType -

76 are compressed using qCompress. Data is written to disk only in insert() -

77 and updateMetaData(). -

78 -

79 Currently you cannot share the same cache files with more than -

80 one disk cache. -

81 -

82 QNetworkDiskCache by default limits the amount of space that the cache will -

83 use on the system to 50MB. -

84 -

85 Note you have to set the cache directory before it will work. -

86 -

87 A network disk cache can be enabled by: -

88 -

89 \snippet code/src_network_access_qnetworkdiskcache.cpp 0 -

90 -

91 When sending requests, to control the preference of when to use the cache -

92 and when to use the network, consider the following: -

93 -

94 \snippet code/src_network_access_qnetworkdiskcache.cpp 1 -

95 -

96 To check whether the response came from the cache or from the network, the -

97 following can be applied: -

98 -

99 \snippet code/src_network_access_qnetworkdiskcache.cpp 2 -

100 */ -

101 -

102 /*! -

103 Creates a new disk cache. The \a parent argument is passed to -

104 QAbstractNetworkCache's constructor. -

105 */ -

106 QNetworkDiskCache::QNetworkDiskCache(QObject *parent) -

107 : QAbstractNetworkCache(*new QNetworkDiskCachePrivate, parent) -

108 { -

109 } -

110 -

111 /*! -

112 Destroys the cache object. This does not clear the disk cache. -

113 */ -

114 QNetworkDiskCache::~QNetworkDiskCache() -

115 { -

116 Q_D(QNetworkDiskCache); -

117 QHashIterator<QIODevice*, QCacheItem*> itqDeleteAll(d->inserting); -

while (it.hasNext()) {