Caches multiple signals into one to avoid slowdown when adding or removing many statements. More...

#include <Soprano/Util/SignalCacheModel>

Inheritance diagram for Soprano::Util::SignalCacheModel:

Public Slots
void	setCacheTime (int msec)

Public Member Functions
	SignalCacheModel (Model *parent=0)
virtual	~SignalCacheModel ()
int	cacheTime () const
Public Member Functions inherited from Soprano::FilterModel
virtual	~FilterModel ()
virtual void	setParentModel (Model *model)
virtual Model *	parentModel () const
virtual Error::ErrorCode	addStatement (const Statement &statement)
Error::ErrorCode	addStatement (const Node &subject, const Node &predicate, const Node &object, const Node &context=Node())
virtual Error::ErrorCode	removeStatement (const Statement &statement)
Error::ErrorCode	removeStatement (const Node &subject, const Node &predicate, const Node &object, const Node &context=Node())
virtual Error::ErrorCode	removeAllStatements (const Statement &statement)
Error::ErrorCode	removeAllStatements (const Node &subject, const Node &predicate, const Node &object, const Node &context=Node())
virtual StatementIterator	listStatements (const Statement &partial) const
StatementIterator	listStatements (const Node &subject, const Node &predicate, const Node &object, const Node &context=Node()) const
virtual NodeIterator	listContexts () const
virtual QueryResultIterator	executeQuery (const QString &query, Query::QueryLanguage language, const QString &userQueryLanguage=QString()) const
virtual bool	containsStatement (const Statement &statement) const
bool	containsStatement (const Node &subject, const Node &predicate, const Node &object, const Node &context=Node()) const
virtual bool	containsAnyStatement (const Statement &statement) const
bool	containsAnyStatement (const Node &subject, const Node &predicate, const Node &object, const Node &context=Node()) const
virtual bool	isEmpty () const
virtual int	statementCount () const
virtual Error::ErrorCode	write (QTextStream &os) const
virtual Node	createBlankNode ()
Public Member Functions inherited from Soprano::Model
virtual	~Model ()
Error::ErrorCode	addStatements (const QList< Statement > &statements)
Error::ErrorCode	removeStatements (const QList< Statement > &statements)
Error::ErrorCode	removeContext (const Node &)
Error::ErrorCode	removeAllStatements ()
StatementIterator	listStatements () const
StatementIterator	listStatementsInContext (const Node &context) const
bool	containsContext (const Node &context) const
Public Member Functions inherited from QObject
	QObject (QObject *parent=0)
	blockSignals (bool block)
	childEvent (QChildEvent *event)
	children ()
	connect (const QObject sender, const char signal, const QObject receiver, const char method, Qt::ConnectionType type=Qt::AutoCompatConnection)
	connect (const QObject sender, const char signal, const char *method, Qt::ConnectionType type=Qt::AutoCompatConnection)
	connectNotify (const char *signal)
	customEvent (QEvent *event)
	deleteLater ()
	destroyed (QObject *obj=0)
	disconnect (const QObject sender, const char signal, const QObject receiver, const char method)
	disconnect (const char signal=0, const QObject receiver=0, const char *method=0)
	disconnect (const QObject receiver, const char method=0)
	disconnectNotify (const char *signal)
	dumpObjectInfo ()
	dumpObjectTree ()
	dynamicPropertyNames ()
	event (QEvent *e)
	eventFilter (QObject watched, QEvent event)
	findChild (const QString &name=QString()
	findChildren (const QString &name=QString()
	findChildren (const QRegExp &regExp)
	inherits (const char *className)
	installEventFilter (QObject *filterObj)
	isWidgetType ()
	killTimer (int id)
	metaObject ()
	moveToThread (QThread *targetThread)
	parent ()
	property (const char *name)
	receivers (const char *signal)
	removeEventFilter (QObject *obj)
	sender ()
	setParent (QObject *parent)
	setProperty (const char *name, const QVariant &value)
	signalsBlocked ()
	startTimer (int interval)
	thread ()
	tr (const char sourceText, const char comment=0, int n=-1)
	trUtf8 (const char sourceText, const char comment=0, int n=-1)
	staticMetaObject
	QObject (QObject parent, const char name)
	checkConnectArgs (const char signal, const QObject object, const char *method)
	child (const char objName, const char inheritsClass=0, bool recursiveSearch=true)
	className ()
	insertChild (QObject *object)
	isA (const char *className)
	name ()
	name (const char *defaultName)
	normalizeSignalSlot (const char *signalSlot)
	removeChild (QObject *object)
	setName (const char *name)
Public Member Functions inherited from Soprano::Error::ErrorCache
virtual	~ErrorCache ()
virtual Error	lastError () const

Protected Member Functions
virtual void	parentStatementsAdded ()
virtual void	parentStatementsRemoved ()
void	timerEvent (QTimerEvent *event)
Protected Member Functions inherited from Soprano::FilterModel
	FilterModel ()
	FilterModel (Model *parent)
virtual void	parentStatementAdded (const Statement &)
virtual void	parentStatementRemoved (const Statement &)
Protected Member Functions inherited from Soprano::Model
	Model ()
Protected Member Functions inherited from Soprano::Error::ErrorCache
	ErrorCache ()
void	clearError () const
void	setError (const Error &) const
void	setError (const QString &errorMessage, int code=ErrorUnknown) const

Detailed Description

Caches multiple signals into one to avoid slowdown when adding or removing many statements.

When adding or removing many statements with separate calls to Model::addStatement or Model::removeStatement Model emits signals Model::statementsAdded and Model::statementsRemoved over and over for each call. This can slow down an application that monitors the state of the model.

The SignalCacheModel caches multiple emitted signals into one, trying to ensure that only one signal is delivered in a certain time. The downside of this is that signals are not delivered immiadetely but through the event loop. This, however, should seldomly be a problem.