Class to handle job queues stored in the DB. More...

Inheritance diagram for JobQueueDB:

Collaboration diagram for JobQueueDB:

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Public Member Functions
	doBatchPushInternal (IDatabase $dbw, array $jobs, $flags, $method)
	This function should not be called outside of JobQueueDB.

	getAllAcquiredJobs ()

	getAllQueuedJobs ()

	getCoalesceLocationInternal ()
	Do not use this function outside of JobQueue/JobQueueGroup.

	recycleAndDeleteStaleJobs ()
	Recycle or destroy any jobs that have been claimed for too long.

Public Member Functions inherited from JobQueue
	ack (Job $job)
	Acknowledge that a job was completed.

	batchPush (array $jobs, $flags=0)
	Push a batch of jobs into the queue.

	deduplicateRootJob (IJobSpecification $job)
	Register the "root job" of a given job into the queue for de-duplication.

	delayedJobsEnabled ()

	delete ()
	Deleted all unclaimed and delayed jobs from the queue.

	flushCaches ()
	Clear any process and persistent caches.

	getAbandonedCount ()
	Get the number of acquired jobs that can no longer be attempted.

	getAcquiredCount ()
	Get the number of acquired jobs (these are temporarily out of the queue).

	getAllAbandonedJobs ()
	Get an iterator to traverse over all abandoned jobs in this queue.

	getAllDelayedJobs ()
	Get an iterator to traverse over all delayed jobs in this queue.

	getDelayedCount ()
	Get the number of delayed jobs (these are temporarily out of the queue).

	getOrder ()

	getReadOnlyReason ()

	getSiblingQueueSizes (array $types)
	Check the size of each of the given queues.

	getSiblingQueuesWithJobs (array $types)
	Check whether each of the given queues are empty.

	getSize ()
	Get the number of available (unacquired, non-delayed) jobs in the queue.

	getType ()

	getWiki ()

	isEmpty ()
	Quickly check if the queue has no available (unacquired, non-delayed) jobs.

	pop ()
	Pop a job off of the queue.

	push ( $jobs, $flags=0)
	Push one or more jobs into the queue.

	waitForBackups ()
	Wait for any replica DBs or backup servers to catch up.

Static Public Member Functions
static	selectFields ()
	Return the list of job fields that should be selected.

Static Public Member Functions inherited from JobQueue
static	factory (array $params)
	Get a job queue object of the specified type.

static	incrStats ( $key, $type, $delta=1)
	Call wfIncrStats() for the queue overall and for the queue type.

Public Attributes
const	CACHE_TTL_SHORT = 30

const	MAX_AGE_PRUNE = 604800

const	MAX_JOB_RANDOM = 2147483647

const	MAX_OFFSET = 255

Public Attributes inherited from JobQueue
const	QOS_ATOMIC = 1

const	ROOTJOB_TTL = 2419200

Protected Member Functions
	__construct (array $params)
	Additional parameters include:

	claimOldest ( $uuid)
	Reserve a row with a single UPDATE without holding row locks over RTTs...

	claimRandom ( $uuid, $rand, $gte)
	Reserve a row with a single UPDATE without holding row locks over RTTs...

	doAck (Job $job)

	doBatchPush (array $jobs, $flags)

	doDeduplicateRootJob (IJobSpecification $job)

	doDelete ()

	doFlushCaches ()

	doGetAbandonedCount ()

	doGetAcquiredCount ()

	doGetSiblingQueueSizes (array $types)

	doGetSiblingQueuesWithJobs (array $types)

	doGetSize ()

	doIsEmpty ()

	doPop ()

	doWaitForBackups ()

	getDB ( $index)

	getJobIterator (array $conds)

	getMasterDB ()

	getReplicaDB ()

	insertFields (IJobSpecification $job)

	optimalOrder ()
	Get the default queue order to use if configuration does not specify one.

	supportedOrders ()
	Get the allowed queue orders for configuration validation.

	throwDBException (DBError $e)

Protected Member Functions inherited from JobQueue
	assertNotReadOnly ()

	doGetDelayedCount ()

	doIsRootJobOldDuplicate (Job $job)

	getRootJobCacheKey ( $signature)

	isRootJobOldDuplicate (Job $job)
	Check if the "root" job of a given job has been superseded by a newer one.

	supportsDelayedJobs ()
	Find out if delayed jobs are supported for configuration validation.

Static Protected Member Functions
static	extractBlob ( $blob)

static	makeBlob ( $params)

Protected Attributes
WANObjectCache	$cache

bool string	$cluster = false
	Name of an external DB cluster.

Protected Attributes inherited from JobQueue
JobQueueAggregator	$aggr

int	$claimTTL
	Time to live in seconds.

BagOStuff	$dupCache

int	$maxTries
	Maximum number of times to try a job.

string	$order
	Job priority for pop()

string bool	$readOnlyReason
	Read only rationale (or false if r/w)

string	$type
	Job type.

string	$wiki
	Wiki ID.

Private Member Functions
	getCacheKey ( $property)

Detailed Description

Class to handle job queues stored in the DB.

Since: 1.21

Definition at line 35 of file JobQueueDB.php.

Constructor & Destructor Documentation

◆ __construct()

JobQueueDB::__construct ( array $params )

protected

Additional parameters include:

cluster : The name of an external cluster registered via LBFactory. If not specified, the primary DB cluster for the wiki will be used. This can be overridden with a custom cluster so that DB handles will be retrieved via LBFactory::getExternalLB() and getConnection().
Parameters

array $params

Reimplemented from JobQueue.

Definition at line 55 of file JobQueueDB.php.

References $params, and cache.

Member Function Documentation

◆ claimOldest()

JobQueueDB::claimOldest ( $uuid )

protected

Reserve a row with a single UPDATE without holding row locks over RTTs...

Parameters

string $uuid 32 char hex string

Returns: stdClass|bool Row|false

Definition at line 406 of file JobQueueDB.php.

References getMasterDB(), type, and wfDebug().

Referenced by doPop().

◆ claimRandom()

JobQueueDB::claimRandom	(	$uuid,
		$rand,
		$gte )

protected

Reserve a row with a single UPDATE without holding row locks over RTTs...

Parameters

string	$uuid	32 char hex string
int	$rand	Random unsigned integer (31 bits)
bool	$gte	Search for job_random >= $random (otherwise job_random <= $random)

Returns: stdClass|bool Row|false

Definition at line 329 of file JobQueueDB.php.

References $dir, cache, getCacheKey(), getMasterDB(), and type.

Referenced by doPop().

◆ doAck()

JobQueueDB::doAck ( Job $job )

protected

See also: JobQueue::doAck()

Parameters

Job $job

Exceptions

MWException

Reimplemented from JobQueue.

Definition at line 466 of file JobQueueDB.php.

References $e, $job, DBO_TRX, getMasterDB(), JobQueue\incrStats(), throwDBException(), and type.

◆ doBatchPush()

JobQueueDB::doBatchPush	(	array	$jobs,
			$flags )

protected

See also: JobQueue::doBatchPush()

Parameters

IJobSpecification[]	$jobs
int	$flags

Exceptions

DBError|Exception

Returns: void

Reimplemented from JobQueue.

Definition at line 186 of file JobQueueDB.php.

References $flags, $fname, doBatchPushInternal(), and getMasterDB().

◆ doBatchPushInternal()

JobQueueDB::doBatchPushInternal	(	IDatabase	$dbw,
		array	$jobs,
			$flags,
			$method )

This function should not be called outside of JobQueueDB.

Parameters

IDatabase	$dbw
IJobSpecification[]	$jobs
int	$flags
string	$method

Exceptions

DBError

Returns: void

Definition at line 216 of file JobQueueDB.php.

References $e, $flags, $job, $res, $rows, Wikimedia\Rdbms\IDatabase\endAtomic(), JobQueue\incrStats(), Wikimedia\Rdbms\IDatabase\insert(), insertFields(), Wikimedia\Rdbms\IDatabase\select(), Wikimedia\Rdbms\IDatabase\startAtomic(), throwDBException(), type, and wfDebug().

Referenced by doBatchPush().

◆ doDeduplicateRootJob()

JobQueueDB::doDeduplicateRootJob ( IJobSpecification $job )

protected

See also: JobQueue::doDeduplicateRootJob()

Parameters

IJobSpecification $job

Exceptions

MWException

Returns: bool

Reimplemented from JobQueue.

Definition at line 495 of file JobQueueDB.php.

References $cache, JobQueue\$dupCache, $job, $params, WANObjectCache\get(), getMasterDB(), JobQueue\getRootJobCacheKey(), JobQueue\ROOTJOB_TTL, and WANObjectCache\set().

◆ doDelete()

JobQueueDB::doDelete ( )

protected

See also: JobQueue::doDelete()

Returns: bool

Reimplemented from JobQueue.

Definition at line 530 of file JobQueueDB.php.

References $e, getMasterDB(), throwDBException(), and type.

◆ doFlushCaches()

JobQueueDB::doFlushCaches ( )

protected

Returns: void

Reimplemented from JobQueue.

Definition at line 553 of file JobQueueDB.php.

References JobQueue\$type, cache, and getCacheKey().

◆ doGetAbandonedCount()

JobQueueDB::doGetAbandonedCount ( )

protected

See also: JobQueue::doGetAbandonedCount()

Returns: int

Exceptions

MWException

Reimplemented from JobQueue.

Definition at line 148 of file JobQueueDB.php.

References $dbr, $e, cache, getCacheKey(), getReplicaDB(), and throwDBException().

◆ doGetAcquiredCount()

JobQueueDB::doGetAcquiredCount ( )

protected

See also: JobQueue::doGetAcquiredCount()

Returns: int

Reimplemented from JobQueue.

Definition at line 117 of file JobQueueDB.php.

References $dbr, $e, cache, getCacheKey(), getReplicaDB(), and throwDBException().

◆ doGetSiblingQueueSizes()

JobQueueDB::doGetSiblingQueueSizes ( array $types )

protected

See also: JobQueue::getSiblingQueuesSize()

Parameters

array $types List of queues types

Returns: array|null (list of queue types) or null if unsupported

Reimplemented from JobQueue.

Definition at line 624 of file JobQueueDB.php.

References $dbr, $res, and getReplicaDB().

◆ doGetSiblingQueuesWithJobs()

JobQueueDB::doGetSiblingQueuesWithJobs ( array $types )

protected

See also: JobQueue::getSiblingQueuesWithJobs()

Parameters

array $types List of queues types

Returns: array|null (list of queue types) or null if unsupported

Reimplemented from JobQueue.

Definition at line 607 of file JobQueueDB.php.

References $dbr, $res, and getReplicaDB().

◆ doGetSize()

JobQueueDB::doGetSize ( )

protected

See also: JobQueue::doGetSize()

Returns: int

Reimplemented from JobQueue.

Definition at line 91 of file JobQueueDB.php.

References $dbr, $e, cache, getCacheKey(), getReplicaDB(), and throwDBException().

◆ doIsEmpty()

JobQueueDB::doIsEmpty ( )

protected

See also: JobQueue::doIsEmpty()

Returns: bool

Reimplemented from JobQueue.

Definition at line 74 of file JobQueueDB.php.

References $dbr, $e, getReplicaDB(), throwDBException(), and type.

◆ doPop()

JobQueueDB::doPop ( )

protected

See also: JobQueue::doPop()

Returns: Job|bool

Reimplemented from JobQueue.

Definition at line 275 of file JobQueueDB.php.

References $e, $job, claimOldest(), claimRandom(), DBO_TRX, Job\factory(), getMasterDB(), JobQueue\incrStats(), order, recycleAndDeleteStaleJobs(), throwDBException(), type, and wfRandomString().

◆ doWaitForBackups()

JobQueueDB::doWaitForBackups ( )

protected

See also: JobQueue::doWaitForBackups()

Returns: void

Reimplemented from JobQueue.

Definition at line 545 of file JobQueueDB.php.

◆ extractBlob()

static JobQueueDB::extractBlob ( $blob )

staticprotected

Parameters

string $blob

Returns: bool|mixed

Definition at line 815 of file JobQueueDB.php.

References $blob, and unserialize().

◆ getAllAcquiredJobs()

JobQueueDB::getAllAcquiredJobs ( )

See also: JobQueue::getAllAcquiredJobs()

Returns: Iterator

Reimplemented from JobQueue.

Definition at line 571 of file JobQueueDB.php.

References getJobIterator(), and JobQueue\getType().

◆ getAllQueuedJobs()

JobQueueDB::getAllQueuedJobs ( )

See also: JobQueue::getAllQueuedJobs()

Returns: Iterator

Reimplemented from JobQueue.

Definition at line 563 of file JobQueueDB.php.

References getJobIterator(), and JobQueue\getType().

◆ getCacheKey()

JobQueueDB::getCacheKey ( $property )

private

Parameters

string $property

Returns: string

Definition at line 792 of file JobQueueDB.php.

References $cluster, $property, list, type, wfForeignMemcKey(), and wfSplitWikiID().

Referenced by claimRandom(), doFlushCaches(), doGetAbandonedCount(), doGetAcquiredCount(), and doGetSize().

◆ getCoalesceLocationInternal()

JobQueueDB::getCoalesceLocationInternal ( )

Do not use this function outside of JobQueue/JobQueueGroup.

Returns: string

Since: 1.22

Reimplemented from JobQueue.

Definition at line 601 of file JobQueueDB.php.

◆ getDB()

JobQueueDB::getDB ( $index )

protected

Parameters

int $index (DB_REPLICA/DB_MASTER)

Returns: DBConnRef

Definition at line 774 of file JobQueueDB.php.

References false.

Referenced by getMasterDB(), and getReplicaDB().

◆ getJobIterator()

JobQueueDB::getJobIterator ( array $conds )

protected

Parameters

array $conds Query conditions

Returns: Iterator

Definition at line 579 of file JobQueueDB.php.

References $dbr, $e, $job, Job\factory(), function, getReplicaDB(), throwDBException(), and unserialize().

Referenced by getAllAcquiredJobs(), and getAllQueuedJobs().

◆ getMasterDB()

JobQueueDB::getMasterDB ( )

protected

Exceptions

JobQueueConnectionError

Returns: DBConnRef

Definition at line 762 of file JobQueueDB.php.

References $e, DB_MASTER, and getDB().

Referenced by claimOldest(), claimRandom(), doAck(), doBatchPush(), doDeduplicateRootJob(), doDelete(), doPop(), insertFields(), and recycleAndDeleteStaleJobs().

◆ getReplicaDB()

JobQueueDB::getReplicaDB ( )

protected

Exceptions

JobQueueConnectionError

Returns: DBConnRef

Definition at line 750 of file JobQueueDB.php.

References $e, DB_REPLICA, and getDB().

Referenced by doGetAbandonedCount(), doGetAcquiredCount(), doGetSiblingQueueSizes(), doGetSiblingQueuesWithJobs(), doGetSize(), doIsEmpty(), and getJobIterator().

◆ insertFields()

JobQueueDB::insertFields ( IJobSpecification $job )

protected

Parameters

IJobSpecification $job

Returns: array

Definition at line 727 of file JobQueueDB.php.

References $job, getMasterDB(), IJobSpecification\getType(), makeBlob(), and serialize().

Referenced by doBatchPushInternal().

◆ makeBlob()

static JobQueueDB::makeBlob ( $params )

staticprotected

Parameters

array | bool $params

Returns: string

Definition at line 803 of file JobQueueDB.php.

References $params, and serialize().

Referenced by insertFields().

◆ optimalOrder()

JobQueueDB::optimalOrder ( )

protected

Get the default queue order to use if configuration does not specify one.

Returns: string One of (random, timestamp, fifo, undefined)

Reimplemented from JobQueue.

Definition at line 66 of file JobQueueDB.php.

◆ recycleAndDeleteStaleJobs()

JobQueueDB::recycleAndDeleteStaleJobs ( )

Recycle or destroy any jobs that have been claimed for too long.

Returns: int Number of jobs recycled/deleted

Definition at line 642 of file JobQueueDB.php.

References $e, $res, JobQueue\$type, getMasterDB(), JobQueue\incrStats(), throwDBException(), and type.

Referenced by doPop().

◆ selectFields()

static JobQueueDB::selectFields ( )

static

Return the list of job fields that should be selected.

Since: 1.23

Returns: array

Definition at line 836 of file JobQueueDB.php.

◆ supportedOrders()

JobQueueDB::supportedOrders ( )

protected

Get the allowed queue orders for configuration validation.

Returns: array Subset of (random, timestamp, fifo, undefined)

Reimplemented from JobQueue.

Definition at line 62 of file JobQueueDB.php.

◆ throwDBException()

JobQueueDB::throwDBException ( DBError $e )

protected

Parameters

DBError $e

Exceptions

JobQueueError

Definition at line 827 of file JobQueueDB.php.

References $e.

Referenced by doAck(), doBatchPushInternal(), doDelete(), doGetAbandonedCount(), doGetAcquiredCount(), doGetSize(), doIsEmpty(), doPop(), getJobIterator(), and recycleAndDeleteStaleJobs().

Member Data Documentation

◆ $cache

WANObjectCache JobQueueDB::$cache

protected

Definition at line 42 of file JobQueueDB.php.

Referenced by doDeduplicateRootJob().

◆ $cluster

bool string JobQueueDB::$cluster = false

protected

Name of an external DB cluster.

False if not set

Definition at line 45 of file JobQueueDB.php.

Referenced by getCacheKey().

◆ CACHE_TTL_SHORT

const JobQueueDB::CACHE_TTL_SHORT = 30

Definition at line 36 of file JobQueueDB.php.

◆ MAX_AGE_PRUNE

const JobQueueDB::MAX_AGE_PRUNE = 604800

Definition at line 37 of file JobQueueDB.php.

◆ MAX_JOB_RANDOM

const JobQueueDB::MAX_JOB_RANDOM = 2147483647

Definition at line 38 of file JobQueueDB.php.

◆ MAX_OFFSET

const JobQueueDB::MAX_OFFSET = 255

Definition at line 39 of file JobQueueDB.php.

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

includes/jobqueue/JobQueueDB.php

Public Member Functions

Static Public Member Functions

Public Attributes

Protected Member Functions

Static Protected Member Functions

Protected Attributes

Private Member Functions

Detailed Description

Constructor & Destructor Documentation

◆ __construct()

Member Function Documentation

◆ claimOldest()

◆ claimRandom()

◆ doAck()

◆ doBatchPush()

◆ doBatchPushInternal()

◆ doDeduplicateRootJob()

◆ doDelete()

◆ doFlushCaches()

◆ doGetAbandonedCount()

◆ doGetAcquiredCount()

◆ doGetSiblingQueueSizes()

◆ doGetSiblingQueuesWithJobs()

◆ doGetSize()

◆ doIsEmpty()

◆ doPop()

◆ doWaitForBackups()

◆ extractBlob()

◆ getAllAcquiredJobs()

◆ getAllQueuedJobs()

◆ getCacheKey()

◆ getCoalesceLocationInternal()

◆ getDB()

◆ getJobIterator()

◆ getMasterDB()

◆ getReplicaDB()

◆ insertFields()

◆ makeBlob()

◆ optimalOrder()

◆ recycleAndDeleteStaleJobs()

◆ selectFields()

◆ supportedOrders()

◆ throwDBException()

Member Data Documentation

◆ $cache

◆ $cluster

◆ CACHE_TTL_SHORT

◆ MAX_AGE_PRUNE

◆ MAX_JOB_RANDOM

◆ MAX_OFFSET