AgentBase Class Reference

from PyKDE4.akonadi import *

Inherits: QObject
Subclasses: Akonadi.PreprocessorBase, Akonadi.ResourceBase
Namespace: Akonadi

Detailed Description

The base class for all Akonadi agents and resources.

This class is a base class for all Akonadi agents, which covers the real agent processes and all resources.

It provides: - lifetime management - change monitoring and recording - configuration interface - problem reporting

Akonadi Server supports several ways to launch agents and resources: - As a separate application (@see AKONADI_AGENT_MAIN) - As a thread in the AgentServer - As a separate process, using the akonadi_agent_launcher

The idea is this, the agent or resource is written as a plugin instead of an executable (@see AgentFactory). In the AgentServer case, the AgentServer looks up the plugin and launches the agent in a separate thread. In the launcher case, a new akonadi_agent_launcher process is started for each agent or resource instance.

When making an Agent or Resource suitable for running in the AgentServer some extra caution is needed. Because multiple instances of several kinds of agents run in the same process, one cannot blindly use global objects like KGlobal. For this reasons several methods where added to avoid problems in this context, most notably AgentBase.config() and AgentBase.componentData(). Additionally, one cannot use QDBusConnection.sessionBus() with dbus < 1.4, because of a multithreading bug in libdbus. Instead one should use DBusConnectionPool.threadConnection() which works around this problem.

Author:: Till Adam <adam@kde.org>, Volker Krause <vkrause@kde.org>

Enumerations
Status	{ Idle, Running, Broken }
Signals
	abortRequested ()
	advancedStatus ({QString:QVariant} status)
	agentNameChanged (QString name)
	configurationDialogAccepted ()
	configurationDialogRejected ()
	error (QString message)
	onlineChanged (bool online)
	percent (int progress)
	reloadConfiguration ()
	status (int status, QString message=QString())
	warning (QString message)
Methods
	__init__ (self, QString id)
	aboutToQuit (self)
QString	agentName (self)
	changeProcessed (self)
Akonadi.ChangeRecorder	changeRecorder (self)
	cleanup (self)
KSharedPtr	config (self)
	configure (self, long windowId)
	doSetOnline (self, bool online)
QString	identifier (self)
bool	isOnline (self)
int	progress (self)
QString	progressMessage (self)
	registerObserver (self, Akonadi.AgentBase.Observer observer)
	setAgentName (self, QString name)
	setNeedsNetwork (self, bool needsNetwork)
	setOnline (self, bool state)
int	status (self)
QString	statusMessage (self)
long	winIdForDialogs (self)
Static Methods
KComponentData	componentData ()

Signal Documentation

abortRequested ( )

Emitted when another application has remotely asked the agent to abort its current operation. Connect to this signal if your agent supports abortion. After aborting and cleaning up, agents should return to Idle status.

Since:: 4.4

Signal syntax:: QObject.connect(source, SIGNAL("abortRequested()"), target_slot)

advancedStatus	(	{QString:QVariant}	status
	)

This signal should be emitted whenever the status of the agent has been changed.

Parameters:

status

The object that describes the status change.

Since:: 4.6

Signal syntax:: QObject.connect(source, SIGNAL("advancedStatus(const QVariantMap&)"), target_slot)

agentNameChanged	(	QString	name
	)

This signal is emitted whenever the name of the agent has changed.

Parameters:

name

The new name of the agent.

Since:: 4.3

Signal syntax:: QObject.connect(source, SIGNAL("agentNameChanged(const QString&)"), target_slot)

configurationDialogAccepted ( )

This signal is emitted whenever the user has accepted the configuration dialog.

Note:: Implementors of agents/resources are responsible to emit this signal if the agent/resource reimplements configure().

Since:: 4.4

Signal syntax:: QObject.connect(source, SIGNAL("configurationDialogAccepted()"), target_slot)

configurationDialogRejected ( )

This signal is emitted whenever the user has rejected the configuration dialog.

Note:: Implementors of agents/resources are responsible to emit this signal if the agent/resource reimplements configure().

Since:: 4.4

Signal syntax:: QObject.connect(source, SIGNAL("configurationDialogRejected()"), target_slot)

error	(	QString	message
	)

This signal shall be used to report errors.

Parameters:

message

The i18n'ed error message.

Signal syntax:: QObject.connect(source, SIGNAL("error(const QString&)"), target_slot)

onlineChanged	(	bool	online
	)

Emitted when the online state changed.

Parameters:

online

The online state.

Since:: 4.2

Signal syntax:: QObject.connect(source, SIGNAL("onlineChanged(bool)"), target_slot)

percent	(	int	progress
	)

This signal should be emitted whenever the progress of an action in the agent (e.g. data transfer, connection establishment to remote server etc.) has changed.

Parameters:

progress

The progress of the action in percent.

Signal syntax:: QObject.connect(source, SIGNAL("percent(int)"), target_slot)

reloadConfiguration ( )

Emitted if another application has changed the agent's configuration remotely and called AgentInstance.reconfigure().

Since:: 4.2

Signal syntax:: QObject.connect(source, SIGNAL("reloadConfiguration()"), target_slot)

status	(	int	status,
		QString	message=QString()
	)

This signal should be emitted whenever the status of the agent has been changed.

Parameters:

	status	The new Status code.
	message	A i18n'ed description of the new status.

Signal syntax:: QObject.connect(source, SIGNAL("status(int, const QString&)"), target_slot)

warning	(	QString	message
	)

This signal shall be used to report warnings.

Parameters:

message

The i18n'ed warning message.

Signal syntax:: QObject.connect(source, SIGNAL("warning(const QString&)"), target_slot)

Method Documentation

__init__	(	self,
		QString	id
	)

Creates an agent base.

Parameters:

The instance id of the agent.

aboutToQuit ( self )

This method is called whenever the agent application is about to quit.

Reimplement this method to do session cleanup (e.g. disconnecting from groupware server).

QString agentName ( self )

Returns the name of the agent.

Since:: 4.3

changeProcessed ( self )

Marks the current change as processes and replays the next change if change recording is enabled (noop otherwise). This method is called from the default implementation of the change notification slots. While not required when not using change recording, it is nevertheless recommended to call this method when done with processing a change notification.

Akonadi.ChangeRecorder changeRecorder ( self )

Returns the Akonadi.ChangeRecorder object used for monitoring. Use this to configure which parts you want to monitor.

cleanup ( self )

This method is called when the agent is removed from the system, so it can do some cleanup stuff.

Note:: If you reimplement this in a subclass make sure to call this base implementation at the end.

KSharedPtr config ( self )

Returns the config object for this Agent.

configure	(	self,
		long	windowId
	)

This method is called whenever the agent shall show its configuration dialog to the user. It will be automatically called when the agent is started for the first time.

Parameters:

windowId

The parent window id.

Note:: If the method is reimplemented it has to emit the configurationDialogAccepted() or configurationDialogRejected() signals depending on the users choice.

doSetOnline	(	self,
		bool	online
	)

This method is called whenever the online status has changed. Reimplement this method to react on online status changes.

QString identifier ( self )

Returns the instance identifier of this agent.

bool isOnline ( self )

Returns whether the agent is currently online.

int progress ( self )

This method returns the current progress of the agent in percentage.

QString progressMessage ( self )

This method returns an i18n'ed description of the current progress.

registerObserver	(	self,
		Akonadi.AgentBase.Observer	observer
	)

Registers the given observer for reacting on monitored or recorded changes.

Parameters:

observer

The change handler to register. No ownership transfer, i.e. the caller stays owner of the pointer and can reset the registration by calling this method with 0

setAgentName	(	self,
		QString	name
	)

This method is used to set the name of the agent.

Since:: 4.3

setNeedsNetwork	(	self,
		bool	needsNetwork
	)

Sets whether the agent needs network or not.

Since:: 4.2

To do: use this in combination with Solid.Networking.Notifier to change the onLine status of the agent.

setOnline	(	self,
		bool	state
	)

Sets whether the agent shall be online or not.

int status ( self )

This signal should be emitted whenever the status of the agent has been changed.

Parameters:

	status	The new Status code.
	message	A i18n'ed description of the new status.

QString statusMessage ( self )

This method returns an i18n'ed description of the current status code.

long winIdForDialogs ( self )

This method returns the windows id, which should be used for dialogs.

Static Method Documentation

KComponentData componentData ( )

Returns the component data object for this agent instance. In case of stand-alone agents this is identical to KGlobal.mainComponent(). In case of in-process agents there is one component data object per agent instance thread. This method provides valid results even when called in the agent ctor.

Since:: 4.6

Enumeration Documentation

Status

This enum describes the different states the agent can be in.

Enumerator:

Idle = 0
Running
Broken

AgentBase Class Reference

Detailed Description

Enumerations

Signals

Methods

Static Methods

Signal Documentation

Method Documentation

Static Method Documentation

Enumeration Documentation

Modules