rhymix/common/framework/drivers/cache/apc.php

<?php

namespace Rhymix\Framework\Drivers\Cache;

/**
 * The APC cache driver.
 */
class APC implements \Rhymix\Framework\Drivers\CacheInterface
{
	/**
	 * Create a new instance of the current cache driver, using the given settings.
	 * 
	 * @param array $config
	 * @return void
	 */
	public function __construct(array $config)
	{
		
	}
	
	/**
	 * 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 function_exists('apc_exists');
	}
	
	/**
	 * Validate cache settings.
	 * 
	 * This method returns true on success and false on failure.
	 * 
	 * @param mixed $config
	 * @return bool
	 */
	public static function validateSettings($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)
	{
		$value = apc_fetch($key);
		return $value === false ? null : $value;
	}
	
	/**
	 * 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, $ttl)
	{
		return apc_store($key, $value, $ttl);
	}
	
	/**
	 * 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 apc_delete($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 apc_exists($key);
	}
	
	/**
	 * 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)
	{
		$result = apc_inc($key, $amount);
		if ($result === false)
		{
			apc_store($key, $amount);
			$result = $amount;
		}
		return $result;
	}
	
	/**
	 * 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)
	{
		$result = apc_dec($key, $amount);
		if ($result === false)
		{
			apc_store($key, 0 - $amount);
			$result = 0 - $amount;
		}
		return $result;
	}
	
	/**
	 * Clear all keys from the cache.
	 * 
	 * This method returns true on success and false on failure.
	 * 
	 * @return bool
	 */
	public function clear()
	{
		return apc_clear_cache('user');
	}
}