MLABJobSchedulerClient Class Reference

Inherits QObject.

Public Slots
bool	checkJobScheduler ()
MLABClientJob *	createJob ()
QString	defaultUserName () const
bool	isConnected ()
QList< MLABClientJob * >	queryJobs (const QVariantMap &properties=QVariantMap())
void	setDefaultUserName (const QString &userName)

Signals
void	connectionLost ()
void	newJob (qlonglong jobID)

Detailed Description

A scripting extension offering access to the MeVisLab job scheduler service, which allows to execute batch jobs in the background even if MeVisLab is not running.

Create a new instance of this class with

client = MLAB.getScriptExtension("JobSchedulerClient")

The actual JobScheduler is not started automatically. The JobScheduler can, e.g., be started from Python in MeVisLab like this:

from PythonQt import QtCore
 
executable = MLABFileManager.getExecutable("MeVisLabJobScheduler")
QtCore.QProcess.startDetached(executable, ["-exec"])

(this way the JobScheduler keeps running when MeVisLab is terminated).

In theory the JobScheduler could be also be installed as a service on Windows, but services on Windows don't have access to a GUI context, which would preclude the use of MeVisLab for batch jobs, which most users will find undesirable.

Member Function Documentation

checkJobScheduler

bool MLABJobSchedulerClient::checkJobScheduler ( )

slot

Check if the job scheduler is available,.

connectionLost

void MLABJobSchedulerClient::connectionLost ( )

signal

Emitted when the connection to the job scheduler is lost.

createJob

MLABClientJob* MLABJobSchedulerClient::createJob ( )

slot

Create a new job.

Configuration is done on the returned object.

defaultUserName

QString MLABJobSchedulerClient::defaultUserName ( ) const

inlineslot

Get the user name that is set by default in all new jobs.

isConnected

bool MLABJobSchedulerClient::isConnected ( )

slot

Check if the client is currently connected to the job scheduler; checkJobScheduler() will automatically try to connect, but isConnected() will not.

newJob

void MLABJobSchedulerClient::newJob ( qlonglong  jobID )

signal

Emitted when a new job is submitted from any client (even this one).

queryJobs

QList<MLABClientJob*> MLABJobSchedulerClient::queryJobs ( const QVariantMap &  properties = QVariantMap() )

slot

Retrieve list of jobs with given properties.

Typically one might query for jobs with a given "jobID", "status", "application", or "userName".

For "status" one can use one of the values "Waiting", "ReadyToRun", "Starting", "Running", "Finished", or "Failed".

If no properties are given, all registered jobs are returned, this includes finished jobs.

If more than one property is given, all properties must match.

Example:

jobs = client.queryJobs({"status": "Finished", "userName": "jdoe"})

setDefaultUserName

void MLABJobSchedulerClient::setDefaultUserName ( const QString &  userName )

inlineslot

Set a new default user name.

This should identify the user that creates any new jobs.