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NullJob Class Reference

No-op job that does nothing. More...

Inherits Job, and GenericParameterJob.

Collaboration diagram for NullJob:

Public Member Functions

 __construct (array $params)
 
 run ()
 Run the job.
 
- Public Member Functions inherited from Job
 __construct ( $command, $params=null)
 
 allowRetries ()
 
Warning
In some setups (i.e. when using change-propagation) jobs may still be retried even when this is false if the job fails due to a timeout unless it is also configured in change-prop config (T358939).
Returns
bool Whether this job can be retried on failure by job runners
Since
1.21

 
 getDeduplicationInfo ()
 Subclasses may need to override this to make duplication detection work.
 
 getLastError ()
 
Returns
string

 
 getMetadata ( $field=null)
 
 getParams ()
 
Returns
array Parameters that specify sources, targets, and options for execution

 
 getQueuedTimestamp ()
 
 getReadyTimestamp ()
 
Returns
int|null UNIX timestamp of when the job was runnable, or null
Since
1.26

 
 getReleaseTimestamp ()
 
 getRequestId ()
 
Returns
string|null Id of the request that created this job. Follows jobs recursively, allowing to track the id of the request that started a job when jobs insert jobs which insert other jobs.
Since
1.27

 
 getRootJobParams ()
 
 getTitle ()
 
 getType ()
 
Returns
string Job type that defines what sort of changes this job makes

 
 hasExecutionFlag ( $flag)
 
Parameters
int$flagJOB_* class constant
Returns
bool
Since
1.31

 
 hasRootJobParams ()
 
 ignoreDuplicates ()
 Whether the queue should reject insertion of this job if a duplicate exists.
 
 isRootJob ()
 
 setMetadata ( $field, $value)
 
 teardown ( $status)
 
 toString ()
 
Returns
string Debugging string describing the job

 
 workItemCount ()
 
- Public Member Functions inherited from RunnableJob
 tearDown ( $status)
 Do any final cleanup after run(), deferred updates, and all DB commits happen.
 

Additional Inherited Members

- Static Public Member Functions inherited from Job
static factory ( $command, $params=[])
 Create the appropriate object to handle a specific job.
 
static newRootJobParams ( $key)
 Get "root job" parameters for a task.
 
- Public Attributes inherited from Job
string $command
 
array $metadata = []
 Additional queue metadata.
 
array $params
 Array of job parameters.
 
- Protected Member Functions inherited from Job
 addTeardownCallback ( $callback)
 
 setLastError ( $error)
 
- Protected Attributes inherited from Job
string $error
 Text for error that occurred last.
 
int $executionFlags = 0
 Bitfield of JOB_* class constants.
 
bool $removeDuplicates = false
 Expensive jobs may set this to true.
 
callable[] $teardownCallbacks = []
 
Title $title
 

Detailed Description

No-op job that does nothing.

This is used for testing purposes, e.g. to measure overall system performance of the JobQueue system, lock contention, etc.

This job can optionally recursively re-queue itself a number of times or spend a fixed amount of time idling in execution time.

Example:
Inserting a null job in the configured job queue:
$ php maintenance/eval.php
> $queue = MediaWikiServices::getInstance()->getJobQueueGroup();
> $job = new NullJob( [ 'lives' => 10 ] );
> $queue->push( $job );
No-op job that does nothing.
Definition NullJob.php:50
if(count( $args)< 1) $job

You can confirm the job has been enqueued via maintenance/showJobs.php:

$ php maintenance/showJobs.php --group
null: 1 queue; 0 claimed (0 active, 0 abandoned)

Definition at line 50 of file NullJob.php.

Constructor & Destructor Documentation

◆ __construct()

NullJob::__construct ( array  $params)
Parameters
array$paramsJob parameters (lives, usleep)

Implements GenericParameterJob.

Definition at line 54 of file NullJob.php.

References $params.

Member Function Documentation

◆ run()

NullJob::run ( )

Run the job.

Returns
bool Success

Implements RunnableJob.

Definition at line 65 of file NullJob.php.

References $job, and $params.


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