08 2024

app/Services/IPinfo/cache/DefaultCache.php

@@ -0,0 +1,82 @@
+<?php
+
+namespace App\Services\IPinfo\cache;
+
+use Symfony\Component\Cache\Adapter\ArrayAdapter;
+use Symfony\Contracts\Cache\ItemInterface;
+
+/**
+ * Default implementation of the CacheInterface. Provides in-memory caching.
+ */
+class DefaultCache implements CacheInterface
+{
+
+    public $maxsize;
+    public $ttl;
+
+    private $cache;
+    private $element_queue;
+
+    public function __construct(int $maxsize, int $ttl)
+    {
+        $this->cache = new ArrayAdapter();
+        $this->element_queue = array();
+        $this->maxsize = $maxsize;
+        $this->ttl = $ttl;
+    }
+
+  /**
+   * Tests if the specified IP address is cached.
+   * @param  string  $ip_address IP address to lookup.
+   * @return boolean Is the IP address data in the cache.
+   */
+    public function has(string $name): bool
+    {
+        return $this->cache->hasItem($name);
+    }
+
+  /**
+   * Set the IP address key to the specified value.
+   * @param string $ip_address IP address to cache data for.
+   * @param mixed $value Data for specified IP address.
+   */
+    public function set(string $name, $value)
+    {
+        if (!$this->cache->hasItem($name)) {
+            $this->element_queue[] = $name;
+        }
+
+        $this->cache->get($name, function (ItemInterface $item) use  ($value) {
+            $item->set($value)->expiresAfter($this->ttl);
+            return $item->get();
+        });
+
+        $this->manageSize();
+    }
+
+  /**
+   * Get data for the specified IP address.
+   * @param  string $ip_address IP address to lookup in cache.
+   * @return mixed IP address data.
+   */
+    public function get(string $name)
+    {
+        return $this->cache->getItem($name)->get();
+    }
+
+  /**
+   * If cache maxsize has been reached, remove oldest elements until limit is reached.
+   */
+    private function manageSize()
+    {
+        $overflow = count($this->element_queue) - $this->maxsize;
+        if ($overflow > 0) {
+            foreach (array_slice($this->element_queue, 0, $overflow) as $name) {
+                if ($this->has($name)) {
+                    $this->cache->delete($name);
+                }
+            }
+            $this->element_queue = array_slice($this->element_queue, $overflow);
+        }
+    }
+}