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<?php
namespace MediaWiki\JobQueue;
use Closure;
use InvalidArgumentException;
use MediaWiki\Page\PageReference;
use MediaWiki\Title\Title;
use Wikimedia\ObjectFactory\ObjectFactory;
/**
* @since 1.40
*/
class JobFactory {
private ObjectFactory $objectFactory;
/** @var array<array|callable|string> Object specs, see ObjectFactory */
private array $jobObjectSpecs;
/**
* @param ObjectFactory $objectFactory
* @param array<array|callable|string> $jobObjectSpecs Object specs, see ObjectFactory
*/
public function __construct( ObjectFactory $objectFactory, array $jobObjectSpecs ) {
$this->objectFactory = $objectFactory;
$this->jobObjectSpecs = $jobObjectSpecs;
}
/**
* Create the appropriate object to handle a specific job.
*
* @note For backwards compatibility with Job::factory,
* this method also supports an alternative signature:
* @code
* newJob(
* string $command,
* PageReference $page,
* array $params
* )
* @endcode
*
* @param string $command Job command
* @param array $params Job parameters
*
* @return Job
* @throws InvalidArgumentException
*/
public function newJob( string $command, $params = [] ): Job {
if ( !isset( $this->jobObjectSpecs[ $command ] ) ) {
throw new InvalidArgumentException( "Invalid job command '{$command}'" );
}
$spec = $this->jobObjectSpecs[ $command ];
$needsTitle = $this->needsTitle( $command, $spec );
// TODO: revisit support for old method signature
if ( $params instanceof PageReference ) {
// Backwards compatibility for old signature ($command, $title, $params)
$title = Title::newFromPageReference( $params );
$params = func_num_args() >= 3 ? func_get_arg( 2 ) : [];
} elseif ( isset( $params['namespace'] ) && isset( $params['title'] ) ) {
// Handle job classes that take title as constructor parameter.
// If a newer classes like GenericParameterJob uses these parameters,
// then this happens in Job::__construct instead.
$title = Title::makeTitle(
$params['namespace'],
$params['title']
);
} else {
// Default title for job classes not implementing GenericParameterJob.
// This must be a valid title because it not directly passed to
// our Job constructor, but rather its subclasses which may expect
// to be able to use it.
$title = Title::makeTitle(
NS_SPECIAL,
'Blankpage'
);
}
if ( $needsTitle ) {
$args = [ $title, $params ];
} else {
$args = [ $params ];
}
/** @var Job $job */
$job = $this->objectFactory->createObject(
$spec,
[
'allowClassName' => true,
'allowCallable' => true,
'extraArgs' => $args,
'assertClass' => Job::class
]
);
// TODO: create a setter, marked @internal
$job->command = $command;
return $job;
}
/**
* Determines whether the job class needs a Title to be passed
* as the first parameter to the constructor.
*
* @param string $command
* @param string|array|Closure $spec
*
* @return bool
*/
private function needsTitle( string $command, $spec ): bool {
if ( is_callable( $spec ) ) {
$needsTitle = true;
} elseif ( is_array( $spec ) ) {
if ( isset( $spec['needsPage'] ) ) {
$needsTitle = $spec['needsPage'];
} elseif ( isset( $spec['class'] ) ) {
$needsTitle = !is_subclass_of( $spec['class'],
GenericParameterJob::class );
} elseif ( isset( $spec['factory'] ) ) {
$needsTitle = true;
} else {
throw new InvalidArgumentException(
"Invalid job specification for '{$command}': " .
"must contain the 'class' or 'factory' key."
);
}
} elseif ( is_string( $spec ) ) {
$needsTitle = !is_subclass_of( $spec,
GenericParameterJob::class );
} else {
throw new InvalidArgumentException(
"Invalid job specification for '{$command}': " .
"must be a callable, an object spec array, or a class name"
);
}
return $needsTitle;
}
}