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<?php |
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namespace Thruster\Component\Dns; |
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use Thruster\Component\Promise\FulfilledPromise; |
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use Thruster\Component\Promise\RejectedPromise; |
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/** |
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* Class RecordCache |
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* |
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* @package Thruster\Component\Dns |
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* @author Aurimas Niekis <[email protected]> |
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*/ |
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class RecordCache |
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{ |
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/** |
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* @var RecordBag[] |
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*/ |
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private $records; |
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/** |
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* @var int |
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*/ |
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private $expiredAt; |
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public function __construct() |
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{ |
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$this->records = []; |
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$this->expirations = []; |
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} |
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public function lookup(Query $query) |
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{ |
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$id = $this->serializeQueryToIdentity($query); |
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$expiredAt = $this->expiredAt; |
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if (false === isset($this->records[$id])) { |
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return new RejectedPromise(); |
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} |
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$recordBag = $this->records[$id]; |
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if (null !== $expiredAt && $expiredAt <= $query->getCurrentTime()) { |
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return new RejectedPromise(); |
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} |
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return new FulfilledPromise($recordBag->all()); |
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} |
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public function storeResponseMessage($currentTime, Message $message) |
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{ |
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foreach ($message->answers as $record) { |
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$this->storeRecord($currentTime, $record); |
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} |
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} |
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public function expire($currentTime) |
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{ |
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$this->expiredAt = $currentTime; |
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} |
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private function storeRecord($currentTime, Record $record) |
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{ |
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$id = $this->serializeRecordToIdentity($record); |
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if (isset($this->records[$id])) { |
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$recordBag = $this->records[$id]; |
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} else { |
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$recordBag = new RecordBag(); |
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} |
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$recordBag->set($currentTime, $record); |
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$this->records[$id] = $recordBag; |
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} |
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private function serializeQueryToIdentity(Query $query) |
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{ |
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return $query->getName() . ':' . $query->getType() . ':' . $query->getClass(); |
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} |
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private function serializeRecordToIdentity(Record $record) |
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{ |
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return $record->getName() . ':' . $record->getType() . ':' . $record->getClass(); |
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} |
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} |
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ThrusterIO /
dns
In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: