Table Of Contents

Previous topic

QFtp

Next topic

QNetworkDiskCache

QAbstractNetworkCache

Inheritance diagram of QAbstractNetworkCache

Inherited by: QNetworkDiskCache

Detailed Description

The PySide.QtNetwork.QAbstractNetworkCache class provides the interface for cache implementations.

PySide.QtNetwork.QAbstractNetworkCache is the base class for every standard cache that is used be PySide.QtNetwork.QNetworkAccessManager . PySide.QtNetwork.QAbstractNetworkCache is an abstract class and cannot be instantiated.

class PySide.QtNetwork.QAbstractNetworkCache([parent=None])
Parameters:parentPySide.QtCore.QObject

Constructs an abstract network cache with the given parent .

PySide.QtNetwork.QAbstractNetworkCache.cacheSize()
Return type:PySide.QtCore.qint64

Returns the current size taken up by the cache. Depending upon the cache implementation this might be disk or memory size.

In the base class this is a pure virtual function.

PySide.QtNetwork.QAbstractNetworkCache.clear()

Removes all items from the cache. Unless there was failures clearing the cache PySide.QtNetwork.QAbstractNetworkCache.cacheSize() should return 0 after a call to clear.

In the base class this is a pure virtual function.

PySide.QtNetwork.QAbstractNetworkCache.data(url)
Parameters:urlPySide.QtCore.QUrl
Return type:PySide.QtCore.QIODevice

Returns the data associated with url .

It is up to the application that requests the data to delete the PySide.QtCore.QIODevice when done with it.

If there is no cache for url , the url is invalid, or if there is an internal cache error 0 is returned.

In the base class this is a pure virtual function.

PySide.QtNetwork.QAbstractNetworkCache.insert(device)
Parameters:devicePySide.QtCore.QIODevice

Inserts the data in device and the prepared meta data into the cache. After this function is called the data and meta data should be retrievable using PySide.QtNetwork.QAbstractNetworkCache.data() and PySide.QtNetwork.QAbstractNetworkCache.metaData() .

To cancel a prepared inserted call PySide.QtNetwork.QAbstractNetworkCache.remove() on the metadata’s url.

In the base class this is a pure virtual function.

PySide.QtNetwork.QAbstractNetworkCache.metaData(url)
Parameters:urlPySide.QtCore.QUrl
Return type:PySide.QtNetwork.QNetworkCacheMetaData

Returns the meta data for the url url .

If the url is valid and the cache contains the data for url, a valid PySide.QtNetwork.QNetworkCacheMetaData is returned.

In the base class this is a pure virtual function.

PySide.QtNetwork.QAbstractNetworkCache.prepare(metaData)
Parameters:metaDataPySide.QtNetwork.QNetworkCacheMetaData
Return type:PySide.QtCore.QIODevice

Returns the device that should be populated with the data for the cache item metaData . When all of the data has been written PySide.QtNetwork.QAbstractNetworkCache.insert() should be called. If metaData is invalid or the url in the metadata is invalid 0 is returned.

The cache owns the device and will take care of deleting it when it is inserted or removed.

To cancel a prepared inserted call PySide.QtNetwork.QAbstractNetworkCache.remove() on the metadata’s url.

In the base class this is a pure virtual function.

PySide.QtNetwork.QAbstractNetworkCache.remove(url)
Parameters:urlPySide.QtCore.QUrl
Return type:PySide.QtCore.bool

Removes the cache entry for url , returning true if success otherwise false.

In the base class this is a pure virtual function.

PySide.QtNetwork.QAbstractNetworkCache.updateMetaData(metaData)
Parameters:metaDataPySide.QtNetwork.QNetworkCacheMetaData

Updates the cache meta date for the metaData’s url to metaData

If the cache does not contains a cache item for the url then no action is taken.

In the base class this is a pure virtual function.