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|
<?php
namespace Drupal\Core\PreWarm;
use Drupal\Core\DependencyInjection\ClassResolverInterface;
// cspell:ignore ABCDEF FCDABE BEDAFC
/**
* Prewarms caches for services that implement PreWarmableInterface.
*
* Takes a list of prewarmable services and prewarms them at random.
* Randomization is used because whenever two or more requests are building
* caches, the most benefit is gained by minimizing duplication. For example
* two requests rely on the same six services but these services are requested
* at different times, one request builds caches for the other and vice versa.
*
* No randomization:
*
* ABCDEF
* ABCDEF
*
* Randomization:
*
* ABCDEF
* FCDABE
*
* Randomization and three requests:
*
* ABCDEF
* FCDABE
* BEDAFC
*
* @internal
*
* @see Drupal\Core\PreWarm\PreWarmableInterface
* @see Drupal\Core\DrupalKernel::handle()
* @see Drupal\Core\LockBackendAbstract::wait()
* @see Drupal\Core\Routing\RouteProvider::preLoadRoutes()
*/
class CachePreWarmer implements CachePreWarmerInterface {
/**
* Whether to prewarm caches at the end of the request.
*/
protected bool $needsPreWarming = FALSE;
public function __construct(
protected readonly ClassResolverInterface $classResolver,
protected array $serviceIds,
) {
// Ensure the serviceId order is random to reduce chances of conflicts.
shuffle($this->serviceIds);
}
/**
* {@inheritdoc}
*/
public function preWarmOneCache(): bool {
$candidate = array_pop($this->serviceIds);
if ($candidate === NULL) {
return FALSE;
}
$service = $this->classResolver->getInstanceFromDefinition($candidate);
$service->preWarm();
return TRUE;
}
/**
* {@inheritdoc}
*/
public function preWarmAllCaches(): bool {
$prewarmed = FALSE;
while ($this->preWarmOneCache()) {
$prewarmed = TRUE;
}
return $prewarmed;
}
}
|
