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<?php |
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declare(strict_types=1); |
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namespace Alpha\VisitorTrackingBundle\Entity; |
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use Doctrine\ORM\Mapping as ORM; |
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/** |
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* @ORM\Entity |
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*/ |
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class Seed |
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{ |
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/** |
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* @var int |
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* |
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* @ORM\Id |
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* @ORM\Column(type="integer") |
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* @ORM\GeneratedValue(strategy="AUTO") |
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*/ |
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protected $id; |
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/** |
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* @var Lifetime |
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* |
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* @ORM\ManyToOne(targetEntity="Lifetime", inversedBy="seeds") |
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*/ |
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protected $lifetime; |
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/** |
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* @var string |
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* |
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* @ORM\Column(type="string") |
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*/ |
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protected $name; |
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/** |
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* @var string |
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* |
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* @ORM\Column(type="string") |
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*/ |
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protected $value; |
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public function __construct(string $name, int $numberOfValues, ?array $weights = null) |
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{ |
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$this->name = $name; |
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$this->setValue($numberOfValues, $weights); |
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} |
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/** |
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* @return int |
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*/ |
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public function getId() |
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{ |
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return $this->id; |
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} |
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/** |
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* @return Lifetime |
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*/ |
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public function getLifetime() |
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{ |
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return $this->lifetime; |
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} |
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/** |
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* @param Lifetime $lifetime |
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* |
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* @return $this |
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*/ |
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public function setLifetime(Lifetime $lifetime) |
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{ |
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$this->lifetime = $lifetime; |
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if (!$this->lifetime->getSeeds()->contains($this)) { |
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$this->lifetime->addSeed($this); |
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} |
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return $this; |
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} |
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/** |
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* @return string |
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*/ |
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public function getName() |
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{ |
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return $this->name; |
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} |
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/** |
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* @return string |
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*/ |
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public function getValue() |
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{ |
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return $this->value; |
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} |
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private function setValue(int $numberOfValues, ?array $weights = null): void |
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{ |
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if ($weights === null) { |
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$weights = \array_fill(1, $numberOfValues, 1); |
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} |
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if (\count($weights) !== $numberOfValues) { |
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throw new \RuntimeException('Number of seed values must equal the count of the weights array'); |
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} |
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// This does not need to be cryptographically secure, mt_rand() is roughly 2x faster than random_int(). |
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/** @noinspection RandomApiMigrationInspection */ |
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$random = \mt_rand(1, (int) \array_sum($weights)); |
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$total = 0; |
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foreach ($weights as $seed => $weight) { |
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$total += $weight; |
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if ($random <= $total) { |
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if (!\is_string($seed)) { |
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$seed = (string) $seed; |
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} |
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$this->value = $seed; |
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return; |
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} |
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} |
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} |
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} |
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Lendable /
VisitorTrackingBundle
