Akonadi::TransactionSequence Class Reference

#include <transactionsequence.h>

Inheritance diagram for Akonadi::TransactionSequence:

Public Member Functions
	TransactionSequence (QObject *parent=nullptr)
	~TransactionSequence () override
void	commit ()
void	rollback ()
void	setAutomaticCommittingEnabled (bool enable)
void	setIgnoreJobFailure (KJob *job)
Public Member Functions inherited from Akonadi::Job
	Job (QObject *parent=nullptr)
	~Job () override
QString	errorString () const final
void	start () override
Public Member Functions inherited from KCompositeJob
	KCompositeJob (QObject *parent=nullptr)
Public Member Functions inherited from KJob
	KJob (QObject *parent=nullptr)
Capabilities	capabilities () const
int	error () const
QString	errorText () const
bool	exec ()
bool	isAutoDelete () const
bool	isFinishedNotificationHidden () const
bool	isStartedWithExec () const
bool	isSuspended () const
unsigned long	percent () const
Q_SCRIPTABLE qulonglong	processedAmount (Unit unit) const
void	setAutoDelete (bool autodelete)
void	setFinishedNotificationHidden (bool hide=true)
void	setUiDelegate (KJobUiDelegate *delegate)
Q_SCRIPTABLE qulonglong	totalAmount (Unit unit) const
KJobUiDelegate *	uiDelegate () const
Public Member Functions inherited from QObject
	QObject (QObject *parent)
QBindable< QString >	bindableObjectName ()
bool	blockSignals (bool block)
const QObjectList &	children () const const
QMetaObject::Connection	connect (const QObject *sender, const char *signal, const char *method, Qt::ConnectionType type) const const
void	deleteLater ()
void	destroyed (QObject *obj)
bool	disconnect (const char *signal, const QObject *receiver, const char *method) const const
bool	disconnect (const QObject *receiver, const char *method) const const
void	dumpObjectInfo () const const
void	dumpObjectTree () const const
QList< QByteArray >	dynamicPropertyNames () const const
virtual bool	event (QEvent *e)
virtual bool	eventFilter (QObject *watched, QEvent *event)
T	findChild (const QString &name, Qt::FindChildOptions options) const const
QList< T >	findChildren (const QRegularExpression &re, Qt::FindChildOptions options) const const
QList< T >	findChildren (const QString &name, Qt::FindChildOptions options) const const
QList< T >	findChildren (Qt::FindChildOptions options) const const
bool	inherits (const char *className) const const
void	installEventFilter (QObject *filterObj)
bool	isQuickItemType () const const
bool	isWidgetType () const const
bool	isWindowType () const const
void	killTimer (int id)
virtual const QMetaObject *	metaObject () const const
void	moveToThread (QThread *targetThread)
QString	objectName () const const
void	objectNameChanged (const QString &objectName)
QObject *	parent () const const
QVariant	property (const char *name) const const
	Q_CLASSINFO (Name, Value)
	Q_EMIT Q_EMIT
	Q_ENUM (...)
	Q_ENUM_NS (...)
	Q_ENUMS (...)
	Q_FLAG (...)
	Q_FLAG_NS (...)
	Q_FLAGS (...)
	Q_GADGET Q_GADGET
	Q_GADGET_EXPORT (EXPORT_MACRO)
	Q_INTERFACES (...)
	Q_INVOKABLE Q_INVOKABLE
	Q_MOC_INCLUDE Q_MOC_INCLUDE
	Q_NAMESPACE Q_NAMESPACE
	Q_NAMESPACE_EXPORT (EXPORT_MACRO)
	Q_OBJECT Q_OBJECT
	Q_PROPERTY (...)
	Q_REVISION Q_REVISION
	Q_SET_OBJECT_NAME (Object)
	Q_SIGNAL Q_SIGNAL
	Q_SIGNALS Q_SIGNALS
	Q_SLOT Q_SLOT
	Q_SLOTS Q_SLOTS
T	qobject_cast (const QObject *object)
T	qobject_cast (QObject *object)
	QT_NO_NARROWING_CONVERSIONS_IN_CONNECT QT_NO_NARROWING_CONVERSIONS_IN_CONNECT
void	removeEventFilter (QObject *obj)
void	setObjectName (const QString &name)
void	setObjectName (QAnyStringView name)
void	setParent (QObject *parent)
bool	setProperty (const char *name, const QVariant &value)
bool	setProperty (const char *name, QVariant &&value)
bool	signalsBlocked () const const
int	startTimer (int interval, Qt::TimerType timerType)
int	startTimer (std::chrono::milliseconds interval, Qt::TimerType timerType)
QThread *	thread () const const

Protected Slots
void	slotResult (KJob *job) override
Protected Slots inherited from Akonadi::Job
void	slotResult (KJob *job) override
Protected Slots inherited from KCompositeJob
virtual void	slotInfoMessage (KJob *job, const QString &message)
virtual void	slotResult (KJob *job)

Protected Member Functions
bool	addSubjob (KJob *job) override
void	doStart () override
Protected Member Functions inherited from Akonadi::Job
virtual bool	doHandleResponse (qint64 tag, const Protocol::CommandPtr &response)
bool	doKill () override
void	emitWriteFinished ()
bool	removeSubjob (KJob *job) override
Protected Member Functions inherited from KCompositeJob
void	clearSubjobs ()
bool	hasSubjobs () const
const QList< KJob * > &	subjobs () const
Protected Member Functions inherited from KJob
virtual bool	doResume ()
virtual bool	doSuspend ()
void	emitPercent (qulonglong processedAmount, qulonglong totalAmount)
void	emitResult ()
void	emitSpeed (unsigned long speed)
bool	isFinished () const
void	setCapabilities (Capabilities capabilities)
void	setError (int errorCode)
void	setErrorText (const QString &errorText)
void	setPercent (unsigned long percentage)
void	setProcessedAmount (Unit unit, qulonglong amount)
void	setProgressUnit (Unit unit)
void	setTotalAmount (Unit unit, qulonglong amount)
Protected Member Functions inherited from QObject
virtual void	childEvent (QChildEvent *event)
virtual void	connectNotify (const QMetaMethod &signal)
virtual void	customEvent (QEvent *event)
virtual void	disconnectNotify (const QMetaMethod &signal)
bool	isSignalConnected (const QMetaMethod &signal) const const
int	receivers (const char *signal) const const
QObject *	sender () const const
int	senderSignalIndex () const const
virtual void	timerEvent (QTimerEvent *event)

Additional Inherited Members
Public Types inherited from Akonadi::Job
enum	Error {   ConnectionFailed = UserDefinedError , ProtocolVersionMismatch , UserCanceled , Unknown ,   UserError = UserDefinedError + 42 }
using	List = QList<Job *>
Public Types inherited from KJob
typedef QFlags< Capability >	Capabilities
enum	Capability
enum	Unit
Properties inherited from QObject
	objectName
Signals inherited from Akonadi::Job
void	aboutToStart (Akonadi::Job *job)
void	writeFinished (Akonadi::Job *job)
Signals inherited from KJob
void	description (KJob *job, const QString &title, const QPair< QString, QString > &field1=QPair< QString, QString >(), const QPair< QString, QString > &field2=QPair< QString, QString >())
void	finished (KJob *job)
void	infoMessage (KJob *job, const QString &message)
void	percentChanged (KJob *job, unsigned long percent)
void	processedAmountChanged (KJob *job, KJob::Unit unit, qulonglong amount)
void	processedSize (KJob *job, qulonglong size)
void	result (KJob *job)
void	resumed (KJob *job)
void	speed (KJob *job, unsigned long speed)
void	suspended (KJob *job)
void	totalAmountChanged (KJob *job, KJob::Unit unit, qulonglong amount)
void	totalSize (KJob *job, qulonglong size)
void	warning (KJob *job, const QString &message)
Public Slots inherited from KJob
bool	kill (KJob::KillVerbosity verbosity=KJob::Quietly)
bool	resume ()
bool	suspend ()
Static Public Member Functions inherited from QObject
QMetaObject::Connection	connect (const QObject *sender, const char *signal, const QObject *receiver, const char *method, Qt::ConnectionType type)
QMetaObject::Connection	connect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt::ConnectionType type)
QMetaObject::Connection	connect (const QObject *sender, PointerToMemberFunction signal, const QObject *context, Functor functor, Qt::ConnectionType type)
QMetaObject::Connection	connect (const QObject *sender, PointerToMemberFunction signal, const QObject *receiver, PointerToMemberFunction method, Qt::ConnectionType type)
QMetaObject::Connection	connect (const QObject *sender, PointerToMemberFunction signal, Functor functor)
bool	disconnect (const QMetaObject::Connection &connection)
bool	disconnect (const QObject *sender, const char *signal, const QObject *receiver, const char *method)
bool	disconnect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method)
bool	disconnect (const QObject *sender, PointerToMemberFunction signal, const QObject *receiver, PointerToMemberFunction method)
QString	tr (const char *sourceText, const char *disambiguation, int n)
Public Attributes inherited from KJob
	Bytes
	Directories
	Files
	Items
	Killable
	NoCapabilities
	Suspendable
	UnitsCount
Public Attributes inherited from QObject
typedef	QObjectList

Detailed Description

Base class for jobs that need to run a sequence of sub-jobs in a transaction.

As soon as the first subjob is added, the transaction is started. As soon as the last subjob has successfully finished, the transaction is committed. If any subjob fails, the transaction is rolled back.

Alternatively, a TransactionSequence object can be used as a parent object for a set of jobs to achieve the same behaviour without subclassing.

Example:

// Delete a couple of items inside a transaction
Akonadi::TransactionSequence *transaction = new Akonadi::TransactionSequence;
connect( transaction, SIGNAL(result(KJob*)), SLOT(transactionFinished(KJob*)) );
 
const Akonadi::Item::List items = ...
 
for( const Akonadi::Item &item : items ) {
  new Akonadi::ItemDeleteJob( item, transaction );
}
 
...
 
MyClass::transactionFinished( KJob *job )
{
  if ( job->error() )
    qDebug() << "Error occurred";
  else
    qDebug() << "Items deleted successfully";
}

Author

Volker Krause vkrau.nosp@m.se@k.nosp@m.de.or.nosp@m.g

Definition at line 54 of file transactionsequence.h.

Constructor & Destructor Documentation

TransactionSequence()

TransactionSequence::TransactionSequence ( QObject * parent = nullptr )

explicit

Creates a new transaction sequence.

Parameters

parent

The parent object.

Definition at line 68 of file transactionsequence.cpp.

~TransactionSequence()

TransactionSequence::~TransactionSequence ( )

override

Destroys the transaction sequence.

Definition at line 73 of file transactionsequence.cpp.

Member Function Documentation

addSubjob()

bool TransactionSequence::addSubjob ( KJob * job )

overrideprotectedvirtual

Adds the given job as a subjob to this job.

This method is automatically called if you construct a job using another job as parent object. The base implementation does the necessary setup to share the network connection with the backend.

Parameters

job	The new subjob.

Reimplemented from Akonadi::Job.

Definition at line 77 of file transactionsequence.cpp.

commit()

void TransactionSequence::commit

(

)

Commits the transaction as soon as all pending sub-jobs finished successfully.

Definition at line 156 of file transactionsequence.cpp.

doStart()

void TransactionSequence::doStart ( )

overrideprotectedvirtual

This method must be reimplemented in the concrete jobs.

It will be called after the job has been started and a connection to the Akonadi backend has been established.

Implements Akonadi::Job.

Definition at line 204 of file transactionsequence.cpp.

rollback()

void TransactionSequence::rollback

(

)

Rolls back the current transaction as soon as possible.

You only need to call this method when you want to roll back due to external reasons (e.g. user cancellation), the transaction is automatically rolled back if one of its subjobs fails.

Since

4.5

Definition at line 223 of file transactionsequence.cpp.

setAutomaticCommittingEnabled()

void TransactionSequence::setAutomaticCommittingEnabled

(

bool

enable

)

Disable automatic committing.

Use this when you want to add jobs to this sequence after execution has been started, usually that is outside of the constructor or the method that creates this transaction sequence.

Note

Calling this method after execution of this job has been started has no effect.

Parameters

enable

true to enable autocommitting (default), false to disable it

Since

4.5

Definition at line 217 of file transactionsequence.cpp.

setIgnoreJobFailure()

void TransactionSequence::setIgnoreJobFailure

(

KJob *

job

)

Sets which job of the sequence might fail without rolling back the complete transaction.

Parameters

job	a job to ignore errors from

Since

4.5

Definition at line 194 of file transactionsequence.cpp.

slotResult

void TransactionSequence::slotResult ( KJob * job )

overrideprotectedslot

Definition at line 101 of file transactionsequence.cpp.

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The documentation for this class was generated from the following files:

• transactionsequence.h
• transactionsequence.cpp