Add cache drivers for APC, file, Memcached, Redis, WinCache and XCache

common/framework/drivers/cache/file.php

@@ -0,0 +1,183 @@
+<?php
+
+namespace Rhymix\Framework\Drivers\Cache;
+
+use Rhymix\Framework\Storage;
+
+/**
+ * The file cache driver.
+ */
+class File implements \Rhymix\Framework\Drivers\CacheInterface
+{
+	/**
+	 * The cache directory.
+	 */
+	protected $_dir;
+	
+	/**
+	 * Create a new instance of the current cache driver, using the given settings.
+	 * 
+	 * @param array $config
+	 * @return void
+	 */
+	public function __construct(array $config)
+	{
+		$this->_dir = \RX_BASEDIR . 'files/cache/store';
+		if (!Storage::isDirectory($this->_dir))
+		{
+			Storage::createDirectory($this->_dir);
+		}
+	}
+	
+	/**
+	 * Check if the current cache driver is supported on this server.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * 
+	 * @return bool
+	 */
+	public function isSupported()
+	{
+		return true;
+	}
+	
+	/**
+	 * Validate cache settings.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * 
+	 * @param mixed $config
+	 * @return bool
+	 */
+	public function validateSettings($config)
+	{
+		return true;
+	}
+	
+	/**
+	 * Get the value of a key.
+	 * 
+	 * This method returns null if the key was not found.
+	 * 
+	 * @param string $key
+	 * @return mixed
+	 */
+	public function get($key)
+	{
+		$filename = $this->_getFilename($key);
+		$data = Storage::readPHPData($filename);
+		
+		if ($data === false)
+		{
+			return null;
+		}
+		elseif (!is_array($data) || count($data) < 2 || ($data[0] > 0 && $data[0] < time()))
+		{
+			Storage::delete($filename);
+			return null;
+		}
+		else
+		{
+			return $data[1];
+		}
+	}
+	
+	/**
+	 * Set the value to a key.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * $ttl is measured in seconds. If it is zero, the key should not expire.
+	 * 
+	 * @param string $key
+	 * @param mixed $value
+	 * @param int $ttl
+	 * @return bool
+	 */
+	public function set($key, $value, $ttl)
+	{
+		return Storage::writePHPData($this->_getFilename($key), array($ttl ? (time() + $ttl) : 0, $value));
+	}
+	
+	/**
+	 * Delete a key.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * If the key does not exist, it should return false.
+	 * 
+	 * @param string $key
+	 * @return bool
+	 */
+	public function delete($key)
+	{
+		return Storage::delete($this->_getFilename($key));
+	}
+	
+	/**
+	 * Check if a key exists.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * 
+	 * @param string $key
+	 * @return bool
+	 */
+	public function exists($key)
+	{
+		return $this->get($key) !== null;
+	}
+	
+	/**
+	 * Increase the value of a key by $amount.
+	 * 
+	 * If the key does not exist, this method assumes that the current value is zero.
+	 * This method returns the new value.
+	 * 
+	 * @param string $key
+	 * @param int $amount
+	 * @return int
+	 */
+	public function incr($key, $amount)
+	{
+		$value = intval($this->get($key));
+		$success = $this->set($key, $value + $amount);
+		return $success ? ($value + $amount) : false;
+	}
+	
+	/**
+	 * Decrease the value of a key by $amount.
+	 * 
+	 * If the key does not exist, this method assumes that the current value is zero.
+	 * This method returns the new value.
+	 * 
+	 * @param string $key
+	 * @param int $amount
+	 * @return int
+	 */
+	public function decr($key, $amount)
+	{
+		return $this->incr($key, 0 - $amount);
+	}
+	
+	/**
+	 * Clear all keys from the cache.
+	 * 
+	 * This method returns true on success and false on failure.
+	 * 
+	 * @return bool
+	 */
+	public function clear()
+	{
+		Storage::deleteDirectory($this->_dir);
+	}
+	
+	/**
+	 * Get the filename to store a key.
+	 * 
+	 * @param string $key
+	 * @return string
+	 */
+	protected function _getFilename($key)
+	{
+		$hash = sha1($key);
+		return $this->_dir . '/' . substr($hash, 0, 2) . '/' . substr($hash, 2, 2) . '/' . $hash . '.php';
+	}
+}