Resync

src/Cheeper/Chapter8/Application/Author/Projection/CountFollowersProjectionHandler.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Cheeper\Chapter8\Application\Author\Projection;
+
+use Cheeper\Chapter7\Application\Author\Projection\CountFollowersProjection;
+use Cheeper\Chapter7\Application\Author\Projection\CreateFollowersCounterProjectionHandler;
+use Redis;
+
+//snippet projector-count-followers
+final class CountFollowersProjectionHandler
+{
+    public function __construct(
+        private Redis $redis
+    ) {
+    }
+
+    public function __invoke(CountFollowersProjection $projection): void
+    {
+        $this->redis->hIncrBy(
+            sprintf(
+                CreateFollowersCounterProjectionHandler::REDIS_KEY_TEMPLATE,
+                $projection->authorId()
+            ),
+            'followers',
+            1
+        );
+    }
+}
+//end-snippet