Cache.php

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<?php
#require_once 'Zend/Server/Cache.php';

class Zend_Json_Server_Cache extends Zend_Server_Cache
{
    public static function saveSmd($filename, Zend_Json_Server $server)
    {
        if (!is_string($filename)
            || (!file_exists($filename) && !is_writable(dirname($filename))))
        {
            return false;
        }

        if (0 === @file_put_contents($filename, $server->getServiceMap()->toJson())) {
            return false;
        }

        return true;
    }

    public static function getSmd($filename)
    {
        if (!is_string($filename)
            || !file_exists($filename)
            || !is_readable($filename))
        {
            return false;
        }


        if (false === ($smd = @file_get_contents($filename))) {
            return false;
        }

        return $smd;
    }

    public static function deleteSmd($filename)
    {
        if (is_string($filename) && file_exists($filename)) {
            unlink($filename);
            return true;
        }

        return false;
    }
}