Initial commit

src/Broker/Topic.php

@@ -0,0 +1,67 @@
+<?php
+
+namespace NoccyLabs\Mercureact\Broker;
+
+use SplObjectStorage;
+
+class Topic
+{
+    const MAX_HISTORY_AGE = 180;
+
+    /** @var string Topic name */
+    private string $topic;
+    /** @var array<string,Message> */
+    private array $messages = [];
+    /** @var int Creation unixtime */
+    private int $created;
+
+    private SubscriptionList $subscribers;
+
+    public function __construct(string $topic)
+    {
+        $this->topic = $topic;
+        $this->subscribers = new SubscriptionList();
+        $this->created = time();
+    }
+
+    public function publish(Message $message)
+    {
+        // TODO check if message id has already been published
+
+        foreach ($this->subscribers as $subscriber) {
+            if ($message->private === true) {
+                // TODO check subscriber access
+            } else {
+                // TODO deliver to subscriber
+            }
+        }
+    }
+
+    public function getAge(): int
+    {
+        return time() - $this->created;
+    }
+
+    public function getHistorySize(): int
+    {
+        return count($this->messages);
+    }
+
+    public function getSubscriberCount(): int
+    {
+        return count($this->subscribers);
+    }
+
+    /**
+     * Garbage collect histry
+     * 
+     */
+    public function garbageCollect(): void
+    {
+        $this->messages = array_filter(
+            $this->messages,
+            fn($message) => $message->getAge() < self::MAX_HISTORY_AGE
+        );
+    }
+}
+