cutehmi::Worker Class Reference

Worker. More...

#include <cutehmi/Worker.hpp>

Inheritance diagram for cutehmi::Worker:

Classes
class	WorkEvent
	Work event. More...

Signals
void	ready ()
	Results are ready. More...

Public Member Functions
	Worker (std::function< void()> task=nullptr)
	Default constructor. More...
	Worker (QThread &thread)
	Constructor. More...
	~Worker () override
std::function< void()>	task () const
	Get task. More...
void	setTask (std::function< void()> task)
	Set task. More...
void	wait () const
	Wait for the worker. More...
bool	isReady () const
	Check if worker is ready. More...
bool	isWorking () const
	Check if worker is working. More...
void	employ (QThread &thread, bool start=true)
	Employ worker. More...
void	work ()
	Do work. More...
Public Member Functions inherited from QObject
virtual const QMetaObject *	metaObject () const const
virtual void *	qt_metacast (const char *)
virtual int	qt_metacall (QMetaObject::Call, int, void **)
	QObject (QObject *parent)
virtual	~QObject ()
virtual bool	eventFilter (QObject *watched, QEvent *event)
QString	objectName () const const
void	setObjectName (const QString &name)
bool	isWidgetType () const const
bool	isWindowType () const const
bool	signalsBlocked () const const
bool	blockSignals (bool block)
QThread *	thread () const const
void	moveToThread (QThread *targetThread)
int	startTimer (int interval, Qt::TimerType timerType)
int	startTimer (std::chrono::milliseconds time, Qt::TimerType timerType)
void	killTimer (int id)
T	findChild (const QString &name, Qt::FindChildOptions options) const const
QList< T >	findChildren (const QString &name, Qt::FindChildOptions options) const const
QList< T >	findChildren (const QRegExp &regExp, Qt::FindChildOptions options) const const
QList< T >	findChildren (const QRegularExpression &re, Qt::FindChildOptions options) const const
const QObjectList &	children () const const
void	setParent (QObject *parent)
void	installEventFilter (QObject *filterObj)
void	removeEventFilter (QObject *obj)
QMetaObject::Connection	connect (const QObject *sender, const char *signal, const char *method, Qt::ConnectionType type) const const
bool	disconnect (const char *signal, const QObject *receiver, const char *method) const const
bool	disconnect (const QObject *receiver, const char *method) const const
void	dumpObjectTree ()
void	dumpObjectInfo ()
void	dumpObjectTree () const const
void	dumpObjectInfo () const const
bool	setProperty (const char *name, const QVariant &value)
QVariant	property (const char *name) const const
QList< QByteArray >	dynamicPropertyNames () const const
void	destroyed (QObject *obj)
void	objectNameChanged (const QString &objectName)
QObject *	parent () const const
bool	inherits (const char *className) const const
void	deleteLater ()

Protected Member Functions
virtual void	job ()
	Worker's job. More...
bool	event (QEvent *event) override
Protected Member Functions inherited from QObject
QObject *	sender () const const
int	senderSignalIndex () const const
int	receivers (const char *signal) const const
bool	isSignalConnected (const QMetaMethod &signal) const const
virtual void	timerEvent (QTimerEvent *event)
virtual void	childEvent (QChildEvent *event)
virtual void	customEvent (QEvent *event)
virtual void	connectNotify (const QMetaMethod &signal)
virtual void	disconnectNotify (const QMetaMethod &signal)

Additional Inherited Members
Static Public Member Functions inherited from QObject
QString	tr (const char *sourceText, const char *disambiguation, int n)
QString	trUtf8 (const char *sourceText, const char *disambiguation, int n)
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 *receiver, PointerToMemberFunction method, Qt::ConnectionType type)
QMetaObject::Connection	connect (const QObject *sender, PointerToMemberFunction signal, Functor functor)
QMetaObject::Connection	connect (const QObject *sender, PointerToMemberFunction signal, const QObject *context, Functor functor, Qt::ConnectionType type)
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 QMetaObject::Connection &connection)
bool	disconnect (const QObject *sender, PointerToMemberFunction signal, const QObject *receiver, PointerToMemberFunction method)
Properties inherited from QObject
	objectName

Detailed Description

Worker.

This class acts as a container that allows specified code to be run in a specified thread. This class is useful when dealing with databases, because Qt SQL module does not allow for sharing database connections across threads. Thus if SQL connection is established in dedicated thread, a worker can run a task in that thread and send ready() signal when the task is finished.

Constructor & Destructor Documentation

Worker() [1/2]

cutehmi::Worker::Worker

(

std::function< void()>

task = nullptr

)

Default constructor.

Parameters

task	task function. See job().

Worker() [2/2]

cutehmi::Worker::Worker

(

QThread &

thread

)

Constructor.

This constructor acts as if employ(thread, false) was called immediately after constructing default worker object.

Parameters

thread

thread in which worker's job should be run.

~Worker()

cutehmi::Worker::~Worker ( )

override

Member Function Documentation

employ()

void cutehmi::Worker::employ	(	QThread &	thread,
		bool	start = true
	)

Employ worker.

Employs worker in another thread. Internally this function moves worker object to the specified thread. This function imposes same restrictions as QObject::moveToThread().

Parameters

thread	thread in which worker's job should be run.
start	start work. If start is set to true, then work() is called immediately.

event()

bool cutehmi::Worker::event ( QEvent *  event )

overrideprotectedvirtual

Reimplemented from QObject.

isReady()

bool cutehmi::Worker::isReady

(

)

const

Check if worker is ready.

Returns

true when worker has completed the job, false otherwise.

Remarks

This method is thread-safe.

isWorking()

bool cutehmi::Worker::isWorking

(

)

const

Check if worker is working.

Returns

true if worker is processing its job, false otherwise.

Remarks

This method is thread-safe.

job()

void cutehmi::Worker::job ( )

protectedvirtual

Worker's job.

This function is called when worker receives WorkEvent event. Use employ() function to run job in a specified thread. This function can be reimplemented. Default implementation calls task function if it has been set (it can be passed to the constructor or set via setTask() function). Default implementation does nothing if task has not been set (i.e. task = nullptr).

ready

void cutehmi::Worker::ready ( )

signal

Results are ready.

This signal is emitted when the job() has been completed and the results are ready.

setTask()

void cutehmi::Worker::setTask

(

std::function< void()>

task

)

Set task.

Parameters

task	task function. See job().

task()

std::function< void()> cutehmi::Worker::task

(

)

const

Get task.

Returns

task function. See job().

wait()

void cutehmi::Worker::wait

(

)

const

Wait for the worker.

Causes calling thread to wait until worker finishes its job. Function does not block until work() has been called. It also won't block if worker has already finished its job.

Remarks

This method is thread-safe.

work()

void cutehmi::Worker::work

(

)

Do work.

This function posts WorkEvent, which tells worker to process the job() inside the thread in which it is employed.

Remarks

This method is thread-safe.