Basic driver and test setup

build/header_comment.txt

@@ -1,13 +1,14 @@
 /**
- * Cache
+ * Banker
  *
  * A Caching library implementing psr/cache
  *
  * PHP version 5.6
  *
- * @package     Cache
+ * @package     Banker
  * @author      Timothy J. Warren <tim@timshomepage.net>
  * @copyright   2016  Timothy J. Warren
  * @license     http://www.opensource.org/licenses/mit-license.html  MIT License
  * @version     1.0.0
+ * @link        https://git.timshomepage.net/timw4mail/banker
  */

composer.json

@@ -1,11 +1,28 @@
 {
 	"name": "aviat/banker",
 	"type": "library",
+	"description": "A caching library implementing PSR-6 (psr/cache)",
+	"keywords": [
+		"cache",
+		"redis",
+		"memcache",
+		"memcached",
+		"psr-6",
+		"psr6"
+	],
+	"provide": {
+		"psr/cache": "1.0.1"
+	},
 	"autoload": {
 		"psr-4": {
 			"Aviat\\Banker\\": "src/"
 		}
 	},
+	"autoload-dev": {
+		"psr-4": {
+			"Aviat\\Banker\\Tests\\": "tests/"
+		}
+	},
 	"require": {
 		"psr/log": "^1.0",
 		"psr/cache": "^1.0"
@@ -24,8 +41,10 @@
 		"squizlabs/php_codesniffer": "^3.0.0@alpha",
 		"theseer/phpdox": "^0.9.0"
 	},
-	"suggests": {
+	"suggest": {
-		"monolog/monolog": "A good standard logging library"
+		"monolog/monolog": "A good standard logging library",
+		"ext-memcache": "Required for Memcache backend",
+		"ext-memcached": "Required for Memcached backend"
 	},
 	"license": "MIT",
 	"authors": [

src/Driver/Driver.php

@@ -1,16 +1,17 @@
 <?php
 /**
- * Cache
+ * Banker
  *
  * A Caching library implementing psr/cache
  *
  * PHP version 5.6
  *
- * @package     Cache
+ * @package	 Banker
  * @author	  Timothy J. Warren <tim@timshomepage.net>
  * @copyright   2016  Timothy J. Warren
  * @license	 http://www.opensource.org/licenses/mit-license.html  MIT License
  * @version	 1.0.0
+ * @link		https://git.timshomepage.net/timw4mail/banker
  */
 
 namespace Aviat\Banker\Driver;
@@ -18,6 +19,26 @@ namespace Aviat\Banker\Driver;
 /**
  * Base class for cache backends
  */
-class Driver implements DriverInterface {
+abstract class Driver implements DriverInterface {
 
+	/**
+	 * The object encapsulating the connection to the cache backend
+	 *
+	 * @var mixed
+	 */
+	protected $conn;
+	
+	/**
+	 * Data to be stored later
+	 *
+	 * @var array
+	 */
+	protected $deferred = [];
+
+	/**
+	 * Common constructor interface for driver classes
+	 *
+	 * @param array $config - Connection parameters for the specified backend
+	 */
+	abstract public function __construct(array $config = []);
 }

src/Driver/DriverInterface.php

@@ -1,16 +1,17 @@
 <?php
 /**
- * Cache
+ * Banker
  *
  * A Caching library implementing psr/cache
  *
  * PHP version 5.6
  *
- * @package     Cache
+ * @package     Banker
  * @author      Timothy J. Warren <tim@timshomepage.net>
  * @copyright   2016  Timothy J. Warren
  * @license     http://www.opensource.org/licenses/mit-license.html  MIT License
  * @version     1.0.0
+ * @link        https://git.timshomepage.net/timw4mail/banker
  */
 
 namespace Aviat\Banker\Driver;
@@ -21,22 +22,59 @@ namespace Aviat\Banker\Driver;
 interface DriverInterface {
 
 	/**
-	 * Returns a Cache Item representing the specified key.
+	 * See if a key exists in the cache
 	 *
-	 * This method must always return a CacheItemInterface object, even in case of
+	 * @param $key
-	 * a cache miss. It MUST NOT return null.
+	 * @return bool
+	 */
+	public function exists($key);
+
+	/**
+	 * Set a cached value
 	 *
 	 * @param string $key
-	 *   The key for which to return the corresponding Cache Item.
+	 * @param mixed $value
-	 *
+	 * @param int $expires
-	 * @throws InvalidArgumentException
+	 * @return DriverInterface
-	 *   If the $key string is not a legal value a \Psr\Cache\InvalidArgumentException
-	 *   MUST be thrown.
-	 *
-	 * @return CacheItemInterface
-	 *   The corresponding Cache Item.
 	 */
-	public function getItem($key);
+	public function set($key, $value, $expires = 0);
 	
+	/**
+	 * Get the value for the selected cache key
+	 *
+	 * @param string $key
+	 * @return mixed
+	 */
+	public function get($key);
 
+	/**
+	 * Retrieve a set of values by their cache key
+	 *
+	 * @param string[] $keys
+	 * @return array
+	 */
+	public function getMultiple(array $keys = []);
+	
+	/**
+	 * Remove an item from the cache
+	 *
+	 * @param string $key
+	 * @return boolean
+	 */
+	public function delete($key);
+	
+	/**
+	 * Remove multiple items from the cache
+	 *
+	 * @param string[] $keys
+	 * @return boolean
+	 */
+	public function deleteMultiple(array $keys = []);
+	
+	/**
+	 * Empty the cache
+	 *
+	 * @return boolean
+	 */
+	public function flush();
 }

src/Driver/MemcacheDriver.php

@@ -0,0 +1,136 @@
+<?php
+/**
+ * Banker
+ *
+ * A Caching library implementing psr/cache
+ *
+ * PHP version 5.6
+ *
+ * @package     Banker
+ * @author      Timothy J. Warren <tim@timshomepage.net>
+ * @copyright   2016  Timothy J. Warren
+ * @license     http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @version     1.0.0
+ * @link        https://git.timshomepage.net/timw4mail/banker
+ */
+
+namespace Aviat\Banker\Driver;
+
+use Aviat\Banker\Exception\CacheException;
+
+/**
+ * Redis cache backend
+ */
+class MemcacheDriver extends Driver {
+
+	/**
+	 * Driver for PHP Memcache extension
+	 *
+	 * @param array $config
+	 * @throws CacheException
+	 */
+	public function __construct(array $config = [])
+	{
+		if ( ! class_exists('Memcache'))
+		{
+			throw new CacheException('Memcache driver requires the PHP memcache extension');
+		}
+
+		$this->conn = new \Memcache();
+
+		$method = ($config['persistent'] === TRUE) ? 'pconnect' : 'connect';
+
+		$this->conn->$method($config['host'], $config['port']);
+	}
+
+	/**
+	 * Disconnect from memcached server
+	 */
+	public function __destruct()
+	{
+		$this->conn->close();
+	}
+
+	/**
+	 * See if a key currently exists in the cache
+	 *
+	 * @param string $key
+	 * @return bool
+	 */
+	public function exists($key)
+	{
+		return $this->conn->get($key) !== FALSE;
+	}
+
+	/**
+	 * Get the value for the selected cache key
+	 *
+	 * @param string $key
+	 * @return mixed
+	 */
+	public function get($key)
+	{
+		return $this->conn->get($key);
+	}
+
+	/**
+	 * Retrieve a set of values by their cache key
+	 *
+	 * @param string[] $keys
+	 * @return array
+	 */
+	public function getMultiple(array $keys = [])
+	{
+		return $this->conn->get($keys);
+	}
+
+	/**
+	 * Set a cached value
+	 *
+	 * @param string $key
+	 * @param mixed $value
+	 * @param int $expires
+	 * @return DriverInterface
+	 */
+	public function set($key, $value, $expires = 0)
+	{
+		$this->conn->set($key, $value, 0, $expires);
+		return $this;
+	}
+
+	/**
+	 * Remove an item from the cache
+	 *
+	 * @param string $key
+	 * @return boolean
+	 */
+	public function delete($key)
+	{
+		return $this->conn->delete($key);
+	}
+
+	/**
+	 * Remove multiple items from the cache
+	 *
+	 * @param string[] $keys
+	 * @return boolean
+	 */
+	public function deleteMultiple(array $keys = [])
+	{
+		// Iteratively delete each item, using a boolean
+		// 'and' operation to return false if any deletion fails
+		return \array_reduce($keys, function($prev, $key) {
+			return $prev && $this->conn->delete($key);
+		}, TRUE);
+	}
+
+	/**
+	 * Empty the cache
+	 *
+	 * @return boolean
+	 */
+	public function flush()
+	{
+		return $this->conn->flush();
+	}
+}

src/Driver/MemcachedDriver.php

@@ -0,0 +1,132 @@
+<?php
+/**
+ * Banker
+ *
+ * A Caching library implementing psr/cache
+ *
+ * PHP version 5.6
+ *
+ * @package     Banker
+ * @author      Timothy J. Warren <tim@timshomepage.net>
+ * @copyright   2016  Timothy J. Warren
+ * @license     http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @version     1.0.0
+ * @link        https://git.timshomepage.net/timw4mail/banker
+ */
+
+namespace Aviat\Banker\Driver;
+
+use Aviat\Banker\Exception\CacheException;
+
+use Memcached;
+use MemcachedException;
+
+/**
+ * Memcached cache backend
+ */
+class MemcachedDriver extends Driver {
+
+	/**
+	 * Driver for PHP Memcache extension
+	 *
+	 * @param array $config
+	 * @throws CacheException
+	 */
+	public function __construct(array $config = [])
+	{
+		if ( ! class_exists('Memcached'))
+		{
+			throw new CacheException("Memcached driver requires memcached extensions");
+		}
+
+		$this->conn = new Memcached();
+
+		$this->conn->addServer($config['host'], $config['port']);
+	}
+
+	/**
+	 * Disconnect from memcached server
+	 */
+	public function __destruct()
+	{
+		$this->conn->quit();
+	}
+
+	/**
+	 * See if a key currently exists in the cache
+	 *
+	 * @param string $key
+	 * @return bool
+	 */
+	public function exists($key)
+	{
+		return $this->conn->get($key) !== FALSE;
+	}
+
+	/**
+	 * Get the value for the selected cache key
+	 *
+	 * @param string $key
+	 * @return mixed
+	 */
+	public function get($key)
+	{
+		return $this->conn->get($key);
+	}
+
+	/**
+	 * Retrieve a set of values by their cache key
+	 *
+	 * @param string[] $keys
+	 * @return array
+	 */
+	public function getMultiple(array $keys = [])
+	{
+		return $this->conn->getMulti($keys);
+	}
+
+	/**
+	 * Set a cached value
+	 *
+	 * @param string $key
+	 * @param mixed $value
+	 * @return DriverInterface
+	 */
+	public function set($key, $value)
+	{
+		$this->conn->set($key, $value);
+		return $this;
+	}
+
+	/**
+	 * Remove an item from the cache
+	 *
+	 * @param string $key
+	 * @return boolean
+	 */
+	public function delete($key)
+	{
+		return $this->conn->delete($key);
+	}
+
+	/**
+	 * Remove multiple items from the cache
+	 *
+	 * @param string[] $keys
+	 * @return boolean
+	 */
+	public function deleteMultiple(array $keys = [])
+	{
+		return $this->conn->deleteMulti($keys);
+	}
+
+	/**
+	 * Empty the cache
+	 *
+	 * @return boolean
+	 */
+	public function flush()
+	{
+		return $this->conn->flush();
+	}
+}

src/Driver/NullDriver.php

@@ -0,0 +1,137 @@
+<?php
+/**
+ * Banker
+ *
+ * A Caching library implementing psr/cache
+ *
+ * PHP version 5.6
+ *
+ * @package     Banker
+ * @author      Timothy J. Warren <tim@timshomepage.net>
+ * @copyright   2016  Timothy J. Warren
+ * @license     http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @version     1.0.0
+ * @link        https://git.timshomepage.net/timw4mail/banker
+ */
+
+namespace Aviat\Banker\Driver;
+
+
+/**
+ * Cache backend for use without a cache server. Only does transient
+ * in-memory caching
+ */
+class NullDriver extends Driver {
+
+	/**
+	 * In memory store
+	 *
+	 * @var array
+	 */
+	protected $store = [];
+
+	/**
+	 * NullDriver constructor.
+	 *
+	 * @param array $config
+	 */
+	public function __construct(array $config = [])
+	{
+		$this->store = [];
+	}
+
+	/**
+	 * See if a key currently exists in the cache
+	 *
+	 * @param string $key
+	 * @return bool
+	 */
+	public function exists($key)
+	{
+		return \array_key_exists($key, $this->store);
+	}
+
+	/**
+	 * Get the value for the selected cache key
+	 *
+	 * @param string $key
+	 * @return mixed
+	 */
+	public function get($key)
+	{
+		return $this->store[$key];
+	}
+
+	/**
+	 * Retrieve a set of values by their cache key
+	 *
+	 * @param string[] $keys
+	 * @return array
+	 */
+	public function getMultiple(array $keys = [])
+	{
+		$output = [];
+
+		foreach($keys as $key)
+		{
+			$output[$key] = $this->get($key);
+		}
+
+		return $output;
+	}
+
+	/**
+	 * Set a cached value
+	 *
+	 * @param string $key
+	 * @param mixed $value
+	 * @param int $expires
+	 * @return DriverInterface
+	 */
+	public function set($key, $value, $expires = 0)
+	{
+		$this->store[$key] = $value;
+		return $this;
+	}
+
+	/**
+	 * Remove an item from the cache
+	 *
+	 * @param string $key
+	 * @return boolean
+	 */
+	public function delete($key)
+	{
+		unset($this->store[$key]);
+		return ( ! array_key_exists($key, $this->store));
+	}
+
+	/**
+	 * Remove multiple items from the cache
+	 *
+	 * @param string[] $keys
+	 * @return boolean
+	 */
+	public function deleteMultiple(array $keys = [])
+	{
+		$res = TRUE;
+
+		foreach($keys as $key)
+		{
+			$res = $res && $this->delete($key);
+		}
+
+		return $res;
+	}
+
+	/**
+	 * Empty the cache
+	 *
+	 * @return boolean
+	 */
+	public function flush()
+	{
+		$this->store = [];
+		return TRUE;
+	}
+}

src/Driver/RedisDriver.php

@@ -1,23 +1,159 @@
 <?php
 /**
- * Cache
+ * Banker
  *
  * A Caching library implementing psr/cache
  *
  * PHP version 5.6
  *
- * @package     Cache
+ * @package     Banker
  * @author      Timothy J. Warren <tim@timshomepage.net>
  * @copyright   2016  Timothy J. Warren
  * @license     http://www.opensource.org/licenses/mit-license.html  MIT License
  * @version     1.0.0
+ * @link        https://git.timshomepage.net/timw4mail/banker
  */
 
 namespace Aviat\Banker\Driver;
 
+use Aviat\Banker\Exception\CacheException;
+use Predis\Client;
+
 /**
  * Redis cache backend
  */
 class RedisDriver extends Driver {
 
+	/**
+	 * The object encapsulating the connection to the Redis server
+	 *
+	 * @var Predis\Client
+	 */
+	protected $conn;
+
+	/**
+	 * RedisDriver constructor.
+	 *
+	 * @param array $config
+	 * @throws CacheException
+	 */
+	public function __construct(array $config = [])
+	{
+		if ( ! class_exists('Predis\\Client'))
+		{
+			throw new CacheException("The redis driver requires the predis/predis composer package to be installed.");
+		}
+
+		$this->conn = new Client($config);
+	}
+
+	/**
+	 * Disconnect from memcached server
+	 */
+	public function __destruct()
+	{
+		$this->conn->quit();
+	}
+
+	/**
+	 * See if a key currently exists in the cache
+	 *
+	 * @param string $key
+	 * @return bool
+	 */
+	public function exists($key)
+	{
+		return (bool) $this->conn->exists($key);
+	}
+
+	/**
+	 * Get the value for the selected cache key
+	 *
+	 * @param string $key
+	 * @return mixed
+	 */
+	public function get($key)
+	{
+		$raw = $this->conn->get($key);
+		return \unserialize($raw);
+	}
+
+	/**
+	 * Retrieve a set of values by their cache key
+	 *
+	 * @param string[] $keys
+	 * @return array
+	 */
+	public function getMultiple(array $keys = [])
+	{
+		$output = [];
+
+		foreach($keys as $key)
+		{
+			$output[$key] = $this->get($key);
+		}
+
+		return $output;
+	}
+
+	/**
+	 * Set a cached value
+	 *
+	 * @param string $key
+	 * @param mixed $value
+	 * @param int $expires
+	 * @return DriverInterface
+	 */
+	public function set($key, $value, $expires = 0)
+	{
+		$value = \serialize($value);
+
+		$this->conn->set($key, $value, "EX {$expires}");
+		return $this;
+	}
+
+	/**
+	 * Remove an item from the cache
+	 *
+	 * @param string $key
+	 * @return boolean
+	 */
+	public function delete($key)
+	{
+		return (bool) $this->conn->del($key);
+	}
+
+	/**
+	 * Remove multiple items from the cache
+	 *
+	 * @param string[] $keys
+	 * @return boolean
+	 */
+	public function deleteMultiple(array $keys = [])
+	{
+		$res = \call_user_func_array([$this->conn, 'del'], $keys);
+		return $res === count($keys);
+	}
+
+	/**
+	 * Empty the cache
+	 *
+	 * @return boolean
+	 */
+	public function flush()
+	{
+		return $this->conn->flushdb();
+	}
+
+	/**
+	 * Set the expiration timestamp of a key
+	 *
+	 * @param string $key
+	 * @param int $expires
+	 * @return boolean
+	 */
+	public function expiresAt($key, $expires)
+	{
+		return (bool) $this->conn->expireat($key, $expires);
+	}
 }

src/Driver/SQLDriver.php

@@ -1,16 +1,17 @@
 <?php
 /**
- * Cache
+ * Banker
  *
  * A Caching library implementing psr/cache
  *
  * PHP version 5.6
  *
- * @package     Cache
+ * @package     Banker
  * @author      Timothy J. Warren <tim@timshomepage.net>
  * @copyright   2016  Timothy J. Warren
  * @license     http://www.opensource.org/licenses/mit-license.html  MIT License
  * @version     1.0.0
+ * @link        https://git.timshomepage.net/timw4mail/banker
  */
 
 namespace Aviat\Banker\Driver;

src/Exception/CacheException.php

@@ -1,16 +1,17 @@
 <?php
 /**
- * Cache
+ * Banker
  *
  * A Caching library implementing psr/cache
  *
  * PHP version 5.6
  *
- * @package     Cache
+ * @package     Banker
  * @author      Timothy J. Warren <tim@timshomepage.net>
  * @copyright   2016  Timothy J. Warren
  * @license     http://www.opensource.org/licenses/mit-license.html  MIT License
  * @version     1.0.0
+ * @link        https://git.timshomepage.net/timw4mail/banker
  */
 
 namespace Aviat\Banker\Exception;

src/Exception/InvalidArgumentException.php

@@ -1,16 +1,17 @@
 <?php
 /**
- * Cache
+ * Banker
  *
  * A Caching library implementing psr/cache
  *
  * PHP version 5.6
  *
- * @package     Cache
+ * @package     Banker
  * @author      Timothy J. Warren <tim@timshomepage.net>
  * @copyright   2016  Timothy J. Warren
  * @license     http://www.opensource.org/licenses/mit-license.html  MIT License
  * @version     1.0.0
+ * @link        https://git.timshomepage.net/timw4mail/banker
  */
 
 namespace Aviat\Banker\Exception;

src/Item.php

@@ -1,26 +1,77 @@
 <?php
 /**
- * Cache
+ * Banker
  *
  * A Caching library implementing psr/cache
  *
  * PHP version 5.6
  *
- * @package     Cache
+ * @package     Banker
  * @author      Timothy J. Warren <tim@timshomepage.net>
  * @copyright   2016  Timothy J. Warren
  * @license     http://www.opensource.org/licenses/mit-license.html  MIT License
  * @version     1.0.0
+ * @link        https://git.timshomepage.net/timw4mail/banker
  */
 
-namespace Aviat\Banker\Driver;
+namespace Aviat\Banker;
 
 use Psr\Cache\CacheItemInterface;
 
+use Aviat\Banker\Driver\DriverInterface;
+
 /**
  * Base class for Cache items
  */
-class DriverCacheItem implements CacheItemInterface {
+class Item implements CacheItemInterface {
+
+	/**
+	 * The driver for the current cache backend
+	 *
+	 * @var DriverInterface
+	 */
+	protected $driver;
+
+	/**
+	 * The key of the cache item
+	 *
+	 * @var string
+	 */
+	protected $key;
+
+	/**
+	 * The expiration time
+	 *
+	 * @var int | null
+	 */
+	protected $expiresAt = NULL;
+
+	/**
+	 * The time to live
+	 *
+	 * @var int | null
+	 */
+	protected $ttl = NULL;
+
+	/**
+	 * The value to save in the cache
+	 *
+	 * @var mixed
+	 */
+	protected $value;
+
+	/**
+	 * Create a Cache Item object
+	 *
+	 * @param DriverInterface $driver
+	 * @param string $key
+	 */
+	public function __construct(DriverInterface $driver, $key)
+	{
+		$this->driver = $driver;
+		$this->key = $key;
+	}
+
 	/**
 	 * Returns the key for the current cache item.
 	 *
@@ -32,7 +83,7 @@ class DriverCacheItem implements CacheItemInterface {
 	 */
 	public function getKey()
 	{
-		
+		return $this->key;
 	}
 
 	/**
@@ -49,7 +100,7 @@ class DriverCacheItem implements CacheItemInterface {
 	 */
 	public function get()
 	{
-		
+		return $this->driver->get($this->key);
 	}
 
 	/**
@@ -63,7 +114,7 @@ class DriverCacheItem implements CacheItemInterface {
 	 */
 	public function isHit()
 	{
-		
+		return $this->driver->exists($this->key);
 	}
 
 	/**
@@ -81,7 +132,8 @@ class DriverCacheItem implements CacheItemInterface {
 	 */
 	public function set($value)
 	{
-		
+		$this->value = $value;
+		return $this;
 	}
 
 	/**
@@ -96,9 +148,9 @@ class DriverCacheItem implements CacheItemInterface {
 	 * @return static
 	 *   The called object.
 	 */
-	public function expiresAt($expiration)
+	public function expiresAt($expiration = NULL)
 	{
-		
+		return $this;
 	}
 
 	/**
@@ -114,8 +166,9 @@ class DriverCacheItem implements CacheItemInterface {
 	 * @return static
 	 *   The called object.
 	 */
-	public function expiresAfter($time)
+	public function expiresAfter($time = 0)
 	{
-		
+		$this->ttl = $time;
+		return $this;
 	}
 }

src/ItemCollection.php

@@ -1,16 +1,17 @@
 <?php
 /**
- * Cache
+ * Banker
  *
  * A Caching library implementing psr/cache
  *
  * PHP version 5.6
  *
- * @package     Cache
+ * @package     Banker
  * @author      Timothy J. Warren <tim@timshomepage.net>
  * @copyright   2016  Timothy J. Warren
  * @license     http://www.opensource.org/licenses/mit-license.html  MIT License
  * @version     1.0.0
+ * @link        https://git.timshomepage.net/timw4mail/banker
  */
 
 namespace Aviat\Banker;
@@ -33,12 +34,12 @@ class ItemCollection extends \ArrayIterator implements \JsonSerializable {
 
 	/**
 	 * Create the collection object from the raw
-	 * CacheitemInterface array
+	 * CacheItemInterface array
 	 *
 	 * @param array $items - array of CacheItemInterface objects
 	 * @param int $flags - flags
 	 */
-	public function __construct(array $items = [], int $flags = 0)
+	public function __construct(array $items = [], $flags = 0)
 	{
 		parent::__construct($items, $flags);
 		$this->items = $items;

src/Pool.php

@@ -1,16 +1,17 @@
 <?php
 /**
- * Cache
+ * Banker
  *
  * A Caching library implementing psr/cache
  *
  * PHP version 5.6
  *
- * @package     Cache
+ * @package     Banker
  * @author      Timothy J. Warren <tim@timshomepage.net>
  * @copyright   2016  Timothy J. Warren
  * @license     http://www.opensource.org/licenses/mit-license.html  MIT License
  * @version     1.0.0
+ * @link        https://git.timshomepage.net/timw4mail/banker
  */
 
 namespace Aviat\Banker;
@@ -20,19 +21,28 @@ use Psr\Cache\CacheItemPoolInterface;
 
 use Aviat\Banker\Driver;
 use Aviat\Banker\Driver\DriverInterface;
+use Aviat\Banker\Exception\InvalidArgumentException;
+use Aviat\Banker\Item;
 
 /**
  * The main cache manager
  */
-class CachePool implements CacheItemPoolInterface {
+class Pool implements CacheItemPoolInterface {
 
 	/**
 	 * Driver class for handling the chosen caching backend
 	 *
-	 * @var DriverInterface $driver
+	 * @var DriverInterface
 	 */
 	protected $driver;
 
+	/**
+	 * Cache Items to be saved
+	 *
+	 * @var array
+	 */
+	protected $deferred = [];
+
 	/**
 	 * Set up the cache backend
 	 *
@@ -40,7 +50,7 @@ class CachePool implements CacheItemPoolInterface {
 	 */
 	public function __construct(array $config)
 	{
-		
+		$this->driver = $this->loadDriver($config);
 	}
 
 	/**
@@ -61,7 +71,13 @@ class CachePool implements CacheItemPoolInterface {
 	 */
 	public function getItem($key)
 	{
+		if ( ! is_string($key))
+		{
+			throw new InvalidArgumentException("Cache key must be a string.");
+		}
 
+		$item = new Item($this->driver, $key);
+		return $item;
 	}
 
 	/**
@@ -82,7 +98,14 @@ class CachePool implements CacheItemPoolInterface {
 	 */
 	public function getItems(array $keys = [])
 	{
+		// Get the set of items selected
+		$items = [];
+		foreach($keys as $key)
+		{
+			$items[$key] = $this->getItem($key);
+		}
 
+		return new ItemCollection($items);
 	}
 
 	/**
@@ -104,7 +127,12 @@ class CachePool implements CacheItemPoolInterface {
 	 */
 	public function hasItem($key)
 	{
+		if ( ! is_string($key))
+		{
+			throw new InvalidArgumentException("Cache item must be a string");
+		}
 
+		return $this->driver->exists($key);
 	}
 
 	/**
@@ -115,7 +143,7 @@ class CachePool implements CacheItemPoolInterface {
 	 */
 	public function clear()
 	{
-		
+		return $this->driver->flush();
 	}
 
 	/**
@@ -133,7 +161,19 @@ class CachePool implements CacheItemPoolInterface {
 	 */
 	public function deleteItem($key)
 	{
+		if ( ! is_string($key))
+		{
+			throw new InvalidArgumentException("Cache item must be a string");
+		}
 
+		if ( ! $this->hasItem($key))
+		{
+			return FALSE;
+		}
+		else
+		{
+			return $this->driver->delete($key);
+		}
 	}
 
 	/**
@@ -151,7 +191,15 @@ class CachePool implements CacheItemPoolInterface {
 	 */
 	public function deleteItems(array $keys)
 	{
+		foreach ($keys as $key)
+		{
+			if ( ! is_string($key))
+			{
+				throw new InvalidArgumentException("Cache item must be a string");
+			}
+		}
 
+		return $this->driver->deleteMultiple($keys);
 	}
 
 	/**
@@ -179,7 +227,7 @@ class CachePool implements CacheItemPoolInterface {
 	 */
 	public function saveDeferred(CacheItemInterface $item)
 	{
-		
+		$this->deferred[] = $item;
 	}
 
 	/**
@@ -190,7 +238,19 @@ class CachePool implements CacheItemPoolInterface {
 	 */
 	public function commit()
 	{
+		if (empty($this->deferred))
+		{
+			return TRUE;
+		}
 
+		$result = TRUE;
+
+		foreach($this->deferred as $item)
+		{
+			$result = $result && $this->save($item);
+		}
+
+		return $result;
 	}
 
 	/**
@@ -204,5 +264,6 @@ class CachePool implements CacheItemPoolInterface {
 		$driver = ucfirst(strtolower($driverConfig['driver']));
 		$class = "Driver\\${driver}Driver";
 
+		return new $class($driverConfig['connection']);
 	}
 }

tests/Driver/DriverTestBase.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace Aviat\Banker\Tests\Driver;
+
+use PHPUnit\Framework\TestCase;
+
+class DriverTestBase extends TestCase {
+
+	protected $driver;
+
+	public function testGetSet()
+	{
+		$this->driver->set('foo', 'bar');
+		$this->assertEquals('bar', $this->driver->get('foo'));
+
+		$bar = [
+			'foo' => [
+				'apple' => 'orange'
+			],
+			'bar' => 'baz'
+		];
+
+		$this->driver->set('bar', $bar);
+		$this->assertEquals($bar, $this->driver->get('bar'));
+	}
+}

tests/Driver/MemcacheDriverTest.php

@@ -0,0 +1,17 @@
+<?php 
+
+namespace Aviat\Banker\Tests\Driver;
+
+use Aviat\Banker\Driver\MemcacheDriver;
+
+class MemcacheDriverTest extends DriverTestBase {
+
+	public function setup()
+	{
+		$this->driver = new MemcacheDriver([
+			'host' => 'localhost',
+			'port' => '11211'
+		]);
+		$this->driver->flush();
+	}
+}

tests/Driver/MemcachedDriverTest.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace Aviat\Banker\Tests\Driver;
+
+use Aviat\Banker\Driver\MemcachedDriver;
+
+class MemcachedDriverTest extends DriverTestBase {
+
+	public function setUp()
+	{
+		$this->driver = new MemcachedDriver([
+			'host' => 'localhost',
+			'port' => '11211',
+		]);
+		$this->driver->flush();
+	}
+}

tests/Driver/RedisDriverTest.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace Aviat\Banker\Tests\Driver;
+
+class RedisDriverTest extends DriverTestBase {
+
+}