#include <qnetworkaccesscachebackend_p.h>

Inheritance diagram for QNetworkAccessCacheBackend:

Collaboration diagram for QNetworkAccessCacheBackend:

Public Member Functions
	QNetworkAccessCacheBackend ()

	~QNetworkAccessCacheBackend ()

void	open () override
	You must implement this in your derived class.

void	close () override
	You must implement this function in your derived class.

bool	start () override
	Prepares the backend and calls open().

qint64	bytesAvailable () const override
	You must implement this function in your derived class.

qint64	read (char *data, qint64 maxlen) override
	Implement this function to support reading from the resource made available by your plugin.

Public Member Functions inherited from QNetworkAccessBackend
	QNetworkAccessBackend (TargetTypes targetTypes, SecurityFeatures securityFeatures, IOFeatures ioFeatures)
	Constructs the QNetworkAccessBackend.

	QNetworkAccessBackend (TargetTypes targetTypes)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

	QNetworkAccessBackend (TargetTypes targetTypes, SecurityFeatures securityFeatures)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

	QNetworkAccessBackend (TargetTypes targetTypes, IOFeatures ioFeatures)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

virtual	~QNetworkAccessBackend ()
	Destructs the QNetworkAccessBackend base class.

SecurityFeatures	securityFeatures () const noexcept
	Returns the security related features that the backend claims to support.

TargetTypes	targetTypes () const noexcept
	Returns the TargetTypes that the backend claims to target.

IOFeatures	ioFeatures () const noexcept
	Returns the I/O features that the backend claims to support.

bool	needsResetableUploadData () const noexcept

virtual void	ignoreSslErrors ()
	This function will be called when the user wants to ignore all TLS handshake errors.

virtual void	ignoreSslErrors (const QList< QSslError > &errors)
	This function will be called when the user wants to ignore specific errors.

virtual QByteArrayView	readPointer ()
	The data which the returned value views must stay valid until at least the next call to a non-const function.

virtual void	advanceReadPointer (qint64 distance)
	This function is to notify your class that distance bytes have been read using readPointer and next time readPointer() is called those bytes should not be included.

virtual bool	wantToRead ()
	This is called before we read if there are no bytes available and we are ready to read more.

QUrl	url () const
	Returns the current URL of the reply.

void	setUrl (const QUrl &url)
	Sets the URL of the reply.

QVariant	header (QNetworkRequest::KnownHeaders header) const
	Returns the value of the header.

void	setHeader (QNetworkRequest::KnownHeaders header, const QVariant &value)
	Sets the value of the header to value.

QByteArray	rawHeader (const QByteArray &header) const
	Returns the value of the header.

void	setRawHeader (const QByteArray &header, const QByteArray &value)
	Sets the value of the header to value.

QNetworkAccessManager::Operation	operation () const
	Returns the operation which was requested when calling QNetworkAccessManager.

bool	isCachingEnabled () const
	Returns `true` if setCachingEnabled was previously called with `true`.

void	setCachingEnabled (bool canCache)
	If canCache is `true` then this hints to us that we can cache the reply that is created.

void	setAttribute (QNetworkRequest::Attribute attribute, const QVariant &value)
	Set attribute to value.

QIODevice *	createUploadByteDevice ()
	Creates a QIODevice for the data provided to upload, if any.

QIODevice *	uploadByteDevice ()
	Returns the upload byte device associated with the current request.

QAbstractNetworkCache *	networkCache () const
	Returns the network cache object that was available when the request was started.

Public Member Functions inherited from QObject
Q_INVOKABLE	QObject (QObject *parent=nullptr)
	Constructs an object with parent object parent.

virtual	~QObject ()
	Destroys the object, deleting all its child objects.

virtual bool	event (QEvent *event)
	This virtual function receives events to an object and should return true if the event e was recognized and processed.

virtual bool	eventFilter (QObject watched, QEvent event)
	Filters events if this object has been installed as an event filter for the watched object.

QString	objectName () const

Q_WEAK_OVERLOAD void	setObjectName (const QString &name)
	Sets the object's name to name.

void	setObjectName (QAnyStringView name)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

QBindable< QString >	bindableObjectName ()

bool	isWidgetType () const
	Returns `true` if the object is a widget; otherwise returns `false`.

bool	isWindowType () const
	Returns `true` if the object is a window; otherwise returns `false`.

bool	isQuickItemType () const
	Returns `true` if the object is a QQuickItem; otherwise returns `false`.

bool	signalsBlocked () const noexcept
	Returns `true` if signals are blocked; otherwise returns `false`.

bool	blockSignals (bool b) noexcept
	If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it).

QThread *	thread () const
	Returns the thread in which the object lives.

bool	moveToThread (QThread *thread QT6_DECL_NEW_OVERLOAD_TAIL)
	Changes the thread affinity for this object and its children and returns `true` on success.

int	startTimer (int interval, Qt::TimerType timerType=Qt::CoarseTimer)
	This is an overloaded function that will start a timer of type timerType and a timeout of interval milliseconds.

int	startTimer (std::chrono::nanoseconds time, Qt::TimerType timerType=Qt::CoarseTimer)

void	killTimer (int id)
	Kills the timer with timer identifier, id.

void	killTimer (Qt::TimerId id)

template<typename T >
T	findChild (QAnyStringView aName, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	Returns the child of this object that can be cast into type T and that is called name, or \nullptr if there is no such object.

template<typename T >
QList< T >	findChildren (QAnyStringView aName, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects.

template<typename T >
T	findChild (Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

template<typename T >
QList< T >	findChildren (Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

const QObjectList &	children () const
	Returns a list of child objects.

void	setParent (QObject *parent)
	Makes the object a child of parent.

void	installEventFilter (QObject *filterObj)
	Installs an event filter filterObj on this object.

void	removeEventFilter (QObject *obj)
	Removes an event filter object obj from this object.

QMetaObject::Connection	connect (const QObject sender, const char signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const

bool	disconnect (const char signal=nullptr, const QObject receiver=nullptr, const char *member=nullptr) const

bool	disconnect (const QObject receiver, const char member=nullptr) const

void	dumpObjectTree () const
	Dumps a tree of children to the debug output.

void	dumpObjectInfo () const
	Dumps information about signal connections, etc.

bool	setProperty (const char *name, const QVariant &value)
	Sets the value of the object's name property to value.

bool	setProperty (const char *name, QVariant &&value)

QVariant	property (const char *name) const
	Returns the value of the object's name property.

QList< QByteArray >	dynamicPropertyNames () const

QBindingStorage *	bindingStorage ()

const QBindingStorage *	bindingStorage () const

QObject *	parent () const
	Returns a pointer to the parent object.

bool	inherits (const char *classname) const
	Returns `true` if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns `false`.

Additional Inherited Members
Public Types inherited from QNetworkAccessBackend
enum class	TargetType { Networked = 0x1 , Local = 0x2 }
	Use the values in this enum to specify what type of target the plugin supports. More...

enum class	SecurityFeature { None = 0x0 , TLS = 0x1 }
	Use the values in this enum to specify what type of security features the plugin may utilize. More...

enum class	IOFeature { None = 0x0 , ZeroCopy = 0x1 , NeedResetableUpload = 0x2 , SupportsSynchronousMode = 0x4 }
	Use the values in this enum to specify what type of IO features the plugin may utilize. More...

Public Slots inherited from QNetworkAccessBackend
void	readyRead ()
	Call this slot when you have more data available to notify the backend that we can attempt to read again.

Public Slots inherited from QObject
void	deleteLater ()
	\threadsafe

Signals inherited from QObject
void	destroyed (QObject *=nullptr)
	This signal is emitted immediately before the object obj is destroyed, after any instances of QPointer have been notified, and cannot be blocked.

void	objectNameChanged (const QString &objectName, QPrivateSignal)
	This signal is emitted after the object's name has been changed.

Static Public Member Functions inherited from QObject
static QMetaObject::Connection	connect (const QObject sender, const char signal, const QObject receiver, const char member, Qt::ConnectionType=Qt::AutoConnection)
	\threadsafe

static QMetaObject::Connection	connect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)

template<typename Func1 , typename Func2 >
static QMetaObject::Connection	connect (const typename QtPrivate::FunctionPointer< Func1 >::Object sender, Func1 signal, const typename QtPrivate::ContextTypeForFunctor< Func2 >::ContextType context, Func2 &&slot, Qt::ConnectionType type=Qt::AutoConnection)

template<typename Func1 , typename Func2 >
static QMetaObject::Connection	connect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, Func2 &&slot)

static bool	disconnect (const QObject sender, const char signal, const QObject receiver, const char member)
	\threadsafe

static bool	disconnect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &member)

static bool	disconnect (const QMetaObject::Connection &)
	Disconnect a connection.

template<typename Func1 , typename Func2 >
static bool	disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object sender, Func1 signal, const typename QtPrivate::FunctionPointer< Func2 >::Object receiver, Func2 slot)

template<typename Func1 >
static bool	disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object sender, Func1 signal, const QObject receiver, void **zero)

Protected Slots inherited from QNetworkAccessBackend
void	finished ()
	Call this slot when there will be no more data available, regardless of whether the transfer was successful or unsuccessful.

void	error (QNetworkReply::NetworkError code, const QString &errorString)
	Call this slot if an error occurs.

void	proxyAuthenticationRequired (const QNetworkProxy &proxy, QAuthenticator *auth)
	Call this slot if, when connecting through a proxy, it requests authentication.

void	authenticationRequired (QAuthenticator *auth)
	Call this slot if the remote resource requests authentication.

void	metaDataChanged ()
	Call this slot, if appropriate, after having processed and updated metadata (e.g.

void	redirectionRequested (const QUrl &destination)
	Call this slot if, when connecting to the resource, a redirect to destination was requested.

Protected Member Functions inherited from QObject
QObject *	sender () const
	Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns \nullptr.

int	senderSignalIndex () const

int	receivers (const char *signal) const
	Returns the number of receivers connected to the signal.

bool	isSignalConnected (const QMetaMethod &signal) const

virtual void	timerEvent (QTimerEvent *event)
	This event handler can be reimplemented in a subclass to receive timer events for the object.

virtual void	childEvent (QChildEvent *event)
	This event handler can be reimplemented in a subclass to receive child events.

virtual void	customEvent (QEvent *event)
	This event handler can be reimplemented in a subclass to receive custom events.

virtual void	connectNotify (const QMetaMethod &signal)

virtual void	disconnectNotify (const QMetaMethod &signal)

	QObject (QObjectPrivate &dd, QObject *parent=nullptr)

Protected Attributes inherited from QObject
QScopedPointer< QObjectData >	d_ptr

Properties inherited from QObject
QString	objectName
	the name of this object

Related Symbols inherited from QObject
template< class T > T	qobject_cast (const QObject *object)
	Returns the given object cast to type T if the object is of type T (or of a subclass); otherwise returns \nullptr.

template< typename T > T	qFindChildqFindChildren (const QObject *obj, const QString &name)()

template< typename T > QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QString &name)()

	QObjectList
	\macro Q_CLASSINFO(Name, Value)

Detailed Description

Definition at line 25 of file qnetworkaccesscachebackend_p.h.

Constructor & Destructor Documentation

◆ QNetworkAccessCacheBackend()

QNetworkAccessCacheBackend::QNetworkAccessCacheBackend ( )

Definition at line 17 of file qnetworkaccesscachebackend.cpp.

◆ ~QNetworkAccessCacheBackend()

QNetworkAccessCacheBackend::~QNetworkAccessCacheBackend ( )

Definition at line 22 of file qnetworkaccesscachebackend.cpp.

Member Function Documentation

◆ bytesAvailable()

qint64 QNetworkAccessCacheBackend::bytesAvailable ( ) const

overridevirtual

You must implement this function in your derived class.

This function is called at various times. It may be called because the user called QNetworkReply::bytesAvailable(), and it may be called before an attempt to read is made.

While this function doesn't technically need to return an accurate number, it may result in reduced performance if it does not. This function must return zero if there are no bytes available.

Implements QNetworkAccessBackend.

Definition at line 98 of file qnetworkaccesscachebackend.cpp.

References QIODevice::bytesAvailable().

Here is the call graph for this function:

◆ close()

void QNetworkAccessCacheBackend::close ( )

overridevirtual

You must implement this function in your derived class.

This function gets called when the QNetworkReply is closed or aborted.

You should not emit an error or call finished() during this call since QtNetwork will set and emit the {QNetworkReply::OperationCanceledError} error by itself after control flow returns from this function.

Implements QNetworkAccessBackend.

Definition at line 96 of file qnetworkaccesscachebackend.cpp.

◆ open()

void QNetworkAccessCacheBackend::open ( )

overridevirtual

You must implement this in your derived class.

During this call you must open the connection and begin the request (see: request()).

As the connection progresses you must call the various public and protected slots on QNetworkAccessBackend. As an example, when you have received some data you must call readyRead(). And when all the data has been received you must call finished(). This could, for example, be done by binding signals inside your own implementation to the slots, or by calling them directly.