GearmanBundle/Module/GearmanCache.php

<?php

namespace Mmoreramerino\GearmanBundle\Module;

/**
 * Gearman cache class
 *
 * @author Marc Morera <marc@ulabox.com>
 */
class GearmanCache
{
    
    /**
     * Construct method. While data is not setted, empty array is loaded.
     * Sets dir and checks it
     */
    public function __construct($dir) {
        
        $this->cachedir = $dir;
        $this->checkDir();
        $this->data = $this->__toCache(array());
    }
    
    /**
     * Cache dir to save all Gearman cached files.
     *
     * @var string
     */
    private $cachedir;
    
    /**
     * Cache filename
     *
     * @var string
     */
    private $cachefile = 'gearman.cache.php';
    
    /**
     * Data loaded and serialized ready for save into cache
     *
     * @var string
     */
    private $data = '';
    
    /**
     * Checks is cache dir is created.
     * Otherwise, it creates it
     * Returns self object
     *
     * @return GearmanCache 
     */
    public function checkDir()
    {
        if (!is_dir($this->cachedir)) {
            mkdir($this->cachedir, 0777, true);
        }
        return $this;
    }
    
    /**
     * Remove gearman cache file
     * Returns self object
     * 
     *
     * @return GearmanCache 
     */
    public function emptyCache()
    {
        if (is_dir($this->cachedir . $this->cachefile)) {
            unlink($this->cachedir . $this->cachefile);
        }
        return $this;
    }
    
    /**
     * Returns if cache file exists
     *
     * @return boolean
     */
    public function existsCacheFile()
    {
        return is_file($this->cachedir . $this->cachefile);
    }
    
    /**
     * Save to cache all gearman cacheable data
     * Returns self object
     *
     * @param array $array
     * @return GearmanCache 
     */
    public function set(Array $array)
    {
        $this->data = "<?php return unserialize('".serialize($array)."');";
        file_put_contents($this->cachedir . $this->cachefile, $this->data);
        return $this;
    }
    
    /**
     * Save data into cache
     * Returns self object
     *
     * @return GearmanCache 
     */
    public function save()
    {
        file_put_contents($this->cachedir . $this->cachefile, $this->data);
        return $this;
    }
    
    /**
     * Retrieve cache data if is loaded
     * if cache does not exist, return false
     *
     * @return Array 
     */
    public function get()
    {
        if (is_file($this->cachedir . $this->cachefile)) {
            return (array)(require($this->cachedir . $this->cachefile));
        }
        return false;
    }
    
    
    /**
     * Transform Array object into cache saveable string
     *
     * @param Array $data
     * @return string 
     */
    public function __toCache(Array $data)
    {
        return "<?php return unserialize('".serialize($data)."');";
    }
}