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<?php |
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declare(strict_types=1); |
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namespace Serializor; |
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use WeakReference; |
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/** |
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* Stasis for WeakReference objects. |
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* Preserves weak reference semantics - if the referenced object isn't |
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* strongly referenced elsewhere, the reference becomes dead. |
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*/ |
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final class WeakReferenceStasis extends Stasis |
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{ |
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private ?object $ref = null; |
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private bool $dead = false; |
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private function __construct() {} |
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public function __serialize(): array |
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{ |
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if ($this->dead) { |
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return ['d' => true]; |
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} |
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return ['r' => $this->ref]; |
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} |
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public function __unserialize(array $data): void |
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{ |
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$this->dead = $data['d'] ?? false; |
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$this->ref = $data['r'] ?? null; |
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} |
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public function getClassName(): string |
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{ |
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return WeakReference::class; |
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} |
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public static function fromWeakReference(WeakReference $value): WeakReferenceStasis |
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{ |
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$frozen = new WeakReferenceStasis(); |
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$frozen->ref = $value->get(); |
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return $frozen; |
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} |
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/** |
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* Mark this weak reference as dead (target not strongly referenced). |
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*/ |
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public function markDead(): void |
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{ |
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$this->dead = true; |
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} |
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/** |
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* Get the referenced object for strong reference tracking. |
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*/ |
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public function getRef(): ?object |
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{ |
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return $this->ref; |
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} |
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public function &getInstance(): mixed |
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{ |
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if ($this->hasInstance()) { |
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return $this->getCachedInstance(); |
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} |
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if ($this->dead || !\is_object($this->ref)) { |
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// Create a dead WeakReference |
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$temp = new \stdClass(); |
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$result = WeakReference::create($temp); |
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unset($temp); |
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} else { |
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$result = WeakReference::create($this->ref); |
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} |
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$this->setInstance($result); |
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return $result; |
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} |
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} |
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