Add NullDriver for cache layer, for the sake of testing, or config without a cache

app/config/config.toml.example

@@ -14,8 +14,8 @@ show_anime_collection = true
 # do you wish to show the manga collection?
 show_manga_collection = false
 
-# cache driver for api calls (SQLDriver, RedisDriver)
-cache_driver = SQLDriver
+# cache driver for api calls (NullDriver, SQLDriver, RedisDriver)
+cache_driver = NullDriver
 
 # path to public directory on the server
 asset_dir = "/../../public"

src/Aviat/Ion/Cache/CacheManager.php

@@ -34,7 +34,7 @@ class CacheManager implements CacheInterface {
 
 		if (empty($driverConf))
 		{
-			$driverConf = 'SQLDriver';
+			$driverConf = 'NullDriver';
 		}
 
 		$driverClass = __NAMESPACE__ . "\\Driver\\{$driverConf}";

src/Aviat/Ion/Cache/Driver/NullDriver.php

@@ -0,0 +1,83 @@
+<?php
+/**
+ * Ion
+ *
+ * Building blocks for web development
+ *
+ * @package	 Ion
+ * @author	  Timothy J. Warren
+ * @copyright   Copyright (c) 2015 - 2016
+ * @license	 MIT
+ */
+
+namespace Aviat\Ion\Cache\Driver;
+
+use Aviat\Ion\Di\ContainerInterface;
+
+/**
+ * The Driver for no real cache
+ */
+class NullDriver implements \Aviat\Ion\Cache\CacheDriverInterface {
+
+	/**
+	 * 'Cache' for Null data store
+	 */
+	protected $data;
+
+	/**
+	 * Create the Redis cache driver
+	 */
+	public function __construct(ContainerInterface $container)
+	{
+		$this->data = [];
+	}
+
+	/**
+	 * Retreive a value from the cache backend
+	 *
+	 * @param string $key
+	 * @return mixed
+	 */
+	public function get($key)
+	{
+		return (array_key_exists($key, $this->data))
+			? $this->data[$key]
+			: NULL;
+	}
+
+	/**
+	 * Set a cached value
+	 *
+	 * @param string $key
+	 * @param mixed $value
+	 * @return CacheDriverInterface
+	 */
+	public function set($key, $value)
+	{
+		$this->data[$key] = $value;
+		return $this;
+	}
+
+	/**
+	 * Invalidate a cached value
+	 *
+	 * @param string $key
+	 * @return CacheDriverInterface
+	 */
+	public function invalidate($key)
+	{
+		unset($this->data[$key]);
+		return $this;
+	}
+
+	/**
+	 * Clear the contents of the cache
+	 *
+	 * @return void
+	 */
+	public function invalidateAll()
+	{
+		$this->data = [];
+	}
+}
+// End of NullDriver.php

tests/Ion/Cache/Driver/NullDriverTest.php

@@ -0,0 +1,17 @@
+<?php
+
+require_once('CacheDriverBase.php');
+
+use Aviat\Ion\Cache\Driver\NullDriver;
+
+class CacheNullDriverTest extends AnimeClient_TestCase {
+	use CacheDriverBase;
+
+	protected $driver;
+
+	public function setUp()
+	{
+		parent::setUp();
+		$this->driver = new NullDriver($this->container);
+	}
+}