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Job Class Reference

Class to both describe a background job and handle jobs. More...

Inheritance diagram for Job:
Collaboration diagram for Job:

Public Member Functions

 __construct ( $command, $title, $params=false)
 
 allowRetries ()
 
 getDeduplicationInfo ()
 Subclasses may need to override this to make duplication detection work. More...
 
 getLastError ()
 
 getParams ()
 
 getQueuedTimestamp ()
 
 getReadyTimestamp ()
 
 getReleaseTimestamp ()
 
 getRequestId ()
 
 getRootJobParams ()
 
 getTitle ()
 
 getType ()
 
 hasExecutionFlag ( $flag)
 
 hasRootJobParams ()
 
 ignoreDuplicates ()
 Whether the queue should reject insertion of this job if a duplicate exists. More...
 
 isRootJob ()
 
 run ()
 Run the job. More...
 
 teardown ( $status)
 Do any final cleanup after run(), deferred updates, and all DB commits happen. More...
 
 toString ()
 
 workItemCount ()
 

Static Public Member Functions

static factory ( $command, Title $title, $params=[])
 Create the appropriate object to handle a specific job. More...
 
static newRootJobParams ( $key)
 Get "root job" parameters for a task. More...
 

Public Attributes

string $command
 
array $metadata = []
 Additional queue metadata. More...
 
array $params
 Array of job parameters. More...
 

Protected Member Functions

 addTeardownCallback ( $callback)
 
 setLastError ( $error)
 

Protected Attributes

string $error
 Text for error that occurred last. More...
 
int $executionFlags = 0
 Bitfield of JOB_* class constants. More...
 
bool $removeDuplicates
 Expensive jobs may set this to true. More...
 
callable [] $teardownCallbacks = []
 
Title $title
 

Detailed Description

Class to both describe a background job and handle jobs.

To push jobs onto queues, use JobQueueGroup::singleton()->push();

Definition at line 30 of file Job.php.

Constructor & Destructor Documentation

◆ __construct()

Job::__construct (   $command,
  $title,
  $params = false 
)
Parameters
string$command
Title$title
array | bool$paramsCan not be === true

Definition at line 103 of file Job.php.

References $command, $params, $title, WebRequest\getRequestId(), and title.

Member Function Documentation

◆ addTeardownCallback()

Job::addTeardownCallback (   $callback)
protected
Parameters
callable$callbackA function with one parameter, the success status, which will be false if the job failed or it succeeded but the DB changes could not be committed or any deferred updates threw an exception. (This parameter was added in 1.28.)
Since
1.27

Definition at line 310 of file Job.php.

Referenced by AssembleUploadChunksJob\run(), and PublishStashedFileJob\run().

◆ allowRetries()

Job::allowRetries ( )
Returns
bool Whether this job can be retried on failure by job runners
Since
1.21

Definition at line 203 of file Job.php.

◆ factory()

static Job::factory (   $command,
Title  $title,
  $params = [] 
)
static

Create the appropriate object to handle a specific job.

Parameters
string$commandJob command
Title$titleAssociated title
array$paramsJob parameters
Exceptions
InvalidArgumentException
Returns
Job

Definition at line 73 of file Job.php.

References $command, $handler, $job, $wgJobClasses, and null.

Referenced by JobQueueDB\doPop(), JobQueueRedis\getJobFromFields(), JobQueueRedis\getJobFromUidInternal(), JobQueueDB\getJobIterator(), JobQueueMemory\jobFromSpecInternal(), and JobTest\testJobFactory().

◆ getDeduplicationInfo()

Job::getDeduplicationInfo ( )

Subclasses may need to override this to make duplication detection work.

The resulting map conveys everything that makes the job unique. This is only checked if ignoreDuplicates() returns true, meaning that duplicate jobs are supposed to be ignored.

Returns
array Map of key/values
Since
1.21

Implements IJobSpecification.

Definition at line 225 of file Job.php.

References getParams(), getTitle(), and getType().

◆ getLastError()

Job::getLastError ( )

Definition at line 388 of file Job.php.

References $error.

Referenced by JobRunner\executeJob().

◆ getParams()

◆ getQueuedTimestamp()

Job::getQueuedTimestamp ( )
Returns
int|null UNIX timestamp of when the job was queued, or null
Since
1.26

Definition at line 160 of file Job.php.

References null, and wfTimestampOrNull().

Referenced by getReadyTimestamp().

◆ getReadyTimestamp()

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

Definition at line 180 of file Job.php.

References getQueuedTimestamp(), and getReleaseTimestamp().

Referenced by JobRunner\executeJob().

◆ getReleaseTimestamp()

Job::getReleaseTimestamp ( )
Returns
int|null UNIX timestamp to delay running this job until, otherwise null
Since
1.22

Implements IJobSpecification.

Definition at line 150 of file Job.php.

References null, and wfTimestampOrNull().

Referenced by getReadyTimestamp().

◆ getRequestId()

Job::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

Definition at line 172 of file Job.php.

References null.

Referenced by DeletePageJob\run().

◆ getRootJobParams()

◆ getTitle()

◆ getType()

◆ hasExecutionFlag()

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

Definition at line 121 of file Job.php.

Referenced by JobRunner\executeJob().

◆ hasRootJobParams()

Job::hasRootJobParams ( )
See also
JobQueue::deduplicateRootJob()
Returns
bool
Since
1.22

Implements IJobSpecification.

Definition at line 291 of file Job.php.

Referenced by JobQueueRedis\doIsRootJobOldDuplicate(), JobQueue\doIsRootJobOldDuplicate(), and isRootJob().

◆ ignoreDuplicates()

Job::ignoreDuplicates ( )

Whether the queue should reject insertion of this job if a duplicate exists.

This can be used to avoid duplicated effort or combined with delayed jobs to coalesce updates into larger batches. Claimed jobs are never treated as duplicates of new jobs, and some queues may allow a few duplicates due to network partitions and fail-over. Thus, additional locking is needed to enforce mutual exclusion if this is really needed.

Returns
bool

Implements IJobSpecification.

Definition at line 195 of file Job.php.

References $removeDuplicates.

◆ isRootJob()

Job::isRootJob ( )
See also
JobQueue::deduplicateRootJob()
Returns
bool Whether this is job is a root job

Implements IJobSpecification.

Definition at line 300 of file Job.php.

References hasRootJobParams().

◆ newRootJobParams()

static Job::newRootJobParams (   $key)
static

Get "root job" parameters for a task.

This is used to no-op redundant jobs, including child jobs of jobs, as long as the children inherit the root job parameters. When a job with root job parameters and "rootJobIsSelf" set is pushed, the deduplicateRootJob() method is automatically called on it. If the root job is only virtual and not actually pushed (e.g. the sub-jobs are inserted directly), then call deduplicateRootJob() directly.

See also
JobQueue::deduplicateRootJob()
Parameters
string$keyA key that identifies the task
Returns
array Map of:
  • rootJobIsSelf : true
  • rootJobSignature : hash (e.g. SHA1) that identifies the task
  • rootJobTimestamp : TS_MW timestamp of this instance of the task
Since
1.21

Definition at line 266 of file Job.php.

References wfTimestampNow().

Referenced by HTMLCacheUpdateJob\newForBacklinks(), LinksUpdate\queueRecursiveJobsForTable(), RefreshLinksPartitionTest\testRefreshLinks(), and JobQueueTest\testRootDeduplication().

◆ run()

Job::run ( )
abstract

Run the job.

Returns
bool Success

Referenced by JobRunner\executeJob(), and WatchedItemStoreUnitTest\getMockJobQueueGroup().

◆ setLastError()

◆ teardown()

Job::teardown (   $status)

Do any final cleanup after run(), deferred updates, and all DB commits happen.

Parameters
bool$statusWhether the job, its deferred updates, and DB commit all succeeded
Since
1.27

Definition at line 319 of file Job.php.

References as.

Referenced by JobRunner\executeJob().

◆ toString()

Job::toString ( )
Returns
string

Definition at line 328 of file Job.php.

References $command, $s, $value, as, FormatJson\encode(), string, and title.

Referenced by JobRunner\commitMasterChanges(), and JobRunner\executeJob().

◆ workItemCount()

Job::workItemCount ( )
Returns
int Number of actually "work items" handled in this job
See also
$wgJobBackoffThrottling
Since
1.23

Definition at line 212 of file Job.php.

Referenced by JobRunner\getBackoffTimeToWait().

Member Data Documentation

◆ $command

string Job::$command

Definition at line 32 of file Job.php.

Referenced by __construct(), factory(), getType(), and toString().

◆ $error

string Job::$error
protected

Text for error that occurred last.

Definition at line 47 of file Job.php.

Referenced by getLastError(), and setLastError().

◆ $executionFlags

int Job::$executionFlags = 0
protected

Bitfield of JOB_* class constants.

Definition at line 53 of file Job.php.

◆ $metadata

array Job::$metadata = []

Additional queue metadata.

Definition at line 38 of file Job.php.

◆ $params

◆ $removeDuplicates

bool Job::$removeDuplicates
protected

Expensive jobs may set this to true.

Definition at line 44 of file Job.php.

Referenced by ignoreDuplicates().

◆ $teardownCallbacks

callable [] Job::$teardownCallbacks = []
protected

Definition at line 50 of file Job.php.

◆ $title


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