Add helper classes that implement PSR-6 caching interface with Rhymix cache backend

common/framework/helpers/CacheItemHelper.php

@@ -0,0 +1,111 @@
+<?php
+
+namespace Rhymix\Framework\Helpers;
+
+use Psr\Cache\CacheItemInterface;
+
+/**
+ * Helper class to implement PSR-6 cache item using Rhymix cache configuration.
+ */
+class CacheItemHelper implements CacheItemInterface
+{
+	/**
+	 * Attributes
+	 */
+	public $key = '';
+	public $value = null;
+	public $expires = null;
+
+	/**
+	 * Constructor.
+	 *
+	 * @param string $key
+	 */
+	public function __construct(string $key)
+	{
+		$this->key = $key;
+	}
+
+    /**
+     * Returns the key for the current cache item.
+     *
+     * @return string
+     */
+    public function getKey()
+	{
+		return $this->key;
+	}
+
+    /**
+     * Retrieves the value of the item from the cache associated with this object's key.
+	 *
+     * @return mixed
+     */
+    public function get()
+	{
+		if ($this->value === null)
+		{
+			$this->value = \Rhymix\Framework\Cache::get($this->key);
+		}
+		return $this->value;
+	}
+
+    /**
+     * Confirms if the cache item lookup resulted in a cache hit.
+	 *
+     * @return bool
+     */
+    public function isHit()
+	{
+		return \Rhymix\Framework\Cache::exists($this->key);
+	}
+
+    /**
+     * Sets the value represented by this cache item.
+     *
+     * @param mixed $value
+     * @return static
+     */
+    public function set($value)
+	{
+		$this->value = $value;
+		return $this;
+	}
+
+    /**
+     * Sets the expiration time for this cache item.
+     *
+     * @param \DateTimeInterface|null $expiration
+     * @return static
+     */
+    public function expiresAt($expiration)
+	{
+		$this->expires = $expiration->getTimestamp();
+		return $this;
+	}
+
+    /**
+     * Sets the expiration time for this cache item.
+     *
+     * @param int|\DateInterval|null $time
+     * @return static
+     */
+    public function expiresAfter($time)
+	{
+		if ($time instanceof \DateInterval)
+		{
+			$date = new \DateTime();
+			$date->add($time);
+			$this->expires = $date->getTimestamp();
+		}
+		elseif (is_int($time))
+		{
+			$this->expires = time() + $time;
+		}
+		else
+		{
+			$this->expires = null;
+		}
+		return $this;
+	}
+}