Merge pull request #15 from toszcze/apc

Added APC cache driver.

system/cache/driver/apc.php

+<?php namespace System\Cache\Driver;
+
+class APC implements \System\Cache\Driver {
+
+	/**
+	 * All of the loaded cache items.
+	 *
+	 * @var array
+	 */
+	private $items = array();
+
+	/**
+	 * Determine if an item exists in the cache.
+	 *
+	 * @param  string  $key
+	 * @return bool
+	 */
+	public function has($key)
+	{
+		return ( ! is_null($this->get($key)));
+	}
+
+	/**
+	 * Get an item from the cache.
+	 *
+	 * @param  string  $key
+	 * @param  mixed   $default
+	 * @return mixed
+	 */
+	public function get($key, $default = null)
+	{
+		// --------------------------------------------------
+		// If the item has already been loaded, return it.
+		// --------------------------------------------------
+		if (array_key_exists($key, $this->items))
+		{
+			return $this->items[$key];
+		}
+
+		// --------------------------------------------------
+		// Attempt to the get the item from cache.
+		// --------------------------------------------------
+		$cache = apc_fetch(\System\Config::get('cache.key').$key);
+
+		// --------------------------------------------------
+		// Verify that the item was retrieved.
+		// --------------------------------------------------
+		if ($cache === false)
+		{
+			return $default;
+		}
+
+		return $this->items[$key] = $cache;
+	}
+
+	/**
+	 * Write an item to the cache.
+	 *
+	 * @param  string  $key
+	 * @param  mixed   $value
+	 * @param  int     $minutes
+	 * @return void
+	 */
+	public function put($key, $value, $minutes)
+	{
+		apc_store(\System\Config::get('cache.key').$key, $value, $minutes * 60);
+	}
+
+	/**
+	 * Delete an item from the cache.
+	 *
+	 * @param  string  $key
+	 * @return void
+	 */
+	public function forget($key)
+	{
+		apc_delete(\System\Config::get('cache.key').$key);
+	}
+
+}
\ No newline at end of file

system/cache/factory.php

@@ -18,6 +18,9 @@ class Factory {
 			case 'memcached':
 				return new Driver\Memcached;
 
+			case 'apc':
+				return new Driver\APC;
+
 			default:
 				throw new \Exception("Cache driver [$driver] is not supported.");
 		}