103 lines
2.2 KiB
PHP
103 lines
2.2 KiB
PHP
<?php
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namespace NoccyLabs\Mercureact\Broker;
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use NoccyLabs\Mercureact\Broker\Subscriber\SubscriberInterface;
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use SplObjectStorage;
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class Topic
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{
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const MAX_HISTORY_AGE = 180;
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/** @var string Topic name */
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private string $topic;
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/** @var array<string,Message> */
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private array $messages = [];
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private ?string $lastEventId = null;
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/** @var int Creation unixtime */
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private int $created;
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private SplObjectStorage $subscribers;
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public function __construct(string $topic)
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{
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$this->topic = $topic;
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$this->subscribers = new SplObjectStorage();
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$this->created = time();
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}
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public function publish(Message $message)
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{
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// check if message id has already been published
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if (isset($this->messages[$message->id])) return;
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$this->messages[$message->id] = $message;
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foreach ($this->subscribers as $subscriber) {
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// Skip sending private messages to unauthorized subscribers
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if ($message->private && !$subscriber->isAuthorized()) {
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continue;
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}
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// Deliver to the subscriber
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$subscriber->deliver($message);
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}
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}
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public function getAge(): int
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{
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return time() - $this->created;
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}
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public function getHistorySize(): int
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{
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return count($this->messages);
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}
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public function getSubscriberCount(): int
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{
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return count($this->subscribers);
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}
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public function addSubscriber(SubscriberInterface $subscriber)
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{
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$this->subscribers->attach($subscriber);
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}
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public function removeSubscriber(SubscriberInterface $subscriber)
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{
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$this->subscribers->detach($subscriber);
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}
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public function getSubscribers(): array
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{
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return iterator_to_array($this->subscribers);
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}
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public function getTopic(): string
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{
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return $this->topic;
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}
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public function getLastEventId(): ?string
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{
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return $this->lastEventId;
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}
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/**
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* Garbage collect histry
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*
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*/
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public function garbageCollect(): void
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{
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$this->messages = array_filter(
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$this->messages,
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fn($message) => $message->getAge() < self::MAX_HISTORY_AGE
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);
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}
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}
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