update readme

implementation/16-caching/src/Repository/MarkdownPageFilesystem.php

@@ -0,0 +1,63 @@
+<?php declare(strict_types=1);
+
+namespace Lubian\NoFramework\Repository;
+
+use Lubian\NoFramework\Exception\NotFound;
+use Lubian\NoFramework\Model\MarkdownPage;
+
+use function array_filter;
+use function array_map;
+use function array_values;
+use function assert;
+use function count;
+use function file_get_contents;
+use function glob;
+use function is_array;
+use function str_replace;
+use function substr;
+use function usleep;
+
+final class MarkdownPageFilesystem implements MarkdownPageRepo
+{
+    public function __construct(private readonly string $dataPath)
+    {
+    }
+
+    /**
+     * @return MarkdownPage[]
+     */
+    public function all(): array
+    {
+        $fileNames = glob($this->dataPath . '*.md');
+        assert(is_array($fileNames));
+        return array_map(function (string $name): MarkdownPage {
+            usleep(100000);
+            $content = file_get_contents($name);
+            $name = str_replace($this->dataPath, '', $name);
+            $name = str_replace('.md', '', $name);
+            $id = (int) substr($name, 0, 2);
+            $title = substr($name, 3);
+            return new MarkdownPage($id, $title, $content);
+        }, $fileNames);
+    }
+
+    public function byId(int $id): MarkdownPage
+    {
+        $callback = fn (MarkdownPage $p): bool => $p->id === $id;
+        $filtered = array_values(array_filter($this->all(), $callback));
+        if (count($filtered) === 0) {
+            throw new NotFound;
+        }
+        return $filtered[0];
+    }
+
+    public function byTitle(string $title): MarkdownPage
+    {
+        $callback = fn (MarkdownPage $p): bool => $p->title === $title;
+        $filtered = array_values(array_filter($this->all(), $callback));
+        if (count($filtered) === 0) {
+            throw new NotFound;
+        }
+        return $filtered[0];
+    }
+}