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<?php
/**
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
namespace MediaWiki\JobQueue;
/**
* Job that has a run() method and metadata accessors for JobQueue::pop() and JobQueue::ack().
*
* Instances are not only enqueueable via JobQueue::push(), but they can also be executed by
* calling their run() method. When constructing a job to be enqueued via JobQueue::push(), it
* will not be possible to construct a RunnableJob instance if the class for that job is not
* loaded by the application for the local DB domain. In that case, the general-purpose
* JobSpecification class can be used instead.
*
* See [the architecture doc](@ref jobqueuearch) for more information.
*
* @stable to implement
* @since 1.33
* @ingroup JobQueue
*/
interface RunnableJob extends IJobSpecification {
/** @var int Job must not be wrapped in the usual explicit LBFactory transaction round */
public const JOB_NO_EXPLICIT_TRX_ROUND = 1;
/**
* Run the job.
*
* If this method returns `false` or completes exceptionally, the job runner will retry executing this
* job unless the number of retries has exceeded its configured retry limit.
* Retries are allowed by default, unless allowRetries() is overridden to disable retries.
*
* See [the architecture doc](@ref jobqueuearch) for more information.
*
* @return bool Return `false` to instruct the job runner to retry a failed job.
* Otherwise return `true` to indicate that a job completed
* (i.e. succeeded, or failed in a way that's deterministic or redundant).
*/
public function run();
/**
* @param string|null $field Metadata field or null to get all the metadata
* @return mixed|null Value; null if missing
*/
public function getMetadata( $field = null );
/**
* @param string $field Key name to set the value for
* @param mixed $value The value to set the field for
* @return mixed|null The prior field value; null if missing
*/
public function setMetadata( $field, $value );
/**
* @param int $flag JOB_* class constant
* @return bool
* @since 1.31
*/
public function hasExecutionFlag( $flag );
/**
* @return 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
*/
public function getRequestId();
/**
* Whether to retry execution of this job if run() returned `false` or threw an exception.
*
* @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).
* @return bool Whether this job can be retried on failure by job runners
* @since 1.21
*/
public function allowRetries();
/**
* @return int Number of actually "work items" handled in this job
* @see $wgJobBackoffThrottling
* @since 1.23
*/
public function workItemCount();
/**
* @return int|null UNIX timestamp of when the job was runnable, or null
* @since 1.26
*/
public function getReadyTimestamp();
/**
* Do any final cleanup after run(), deferred updates, and all DB commits happen
* @param bool $status Whether the job, its deferred updates, and DB commit all succeeded
* @since 1.27
*/
public function tearDown( $status );
/**
* @return string
*/
public function getLastError();
/**
* @return string Debugging string describing the job
*/
public function toString();
}
/** @deprecated class alias since 1.44 */
class_alias( RunnableJob::class, 'RunnableJob' );