<?php


/*
 * khoaofgod@gmail.com
 * Website: http://www.phpfastcache.com
 * Example at our website, any bugs, problems, please visit http://faster.phpfastcache.com
 */


class phpfastcache_memcache extends BasePhpFastCache implements phpfastcache_driver {

    var $instant;

    function checkdriver() {
        // Check memcache
        if(function_exists("memcache_connect")) {
            return true;
        }
	    $this->fallback = true;
        return false;
    }

    function __construct($config = array()) {
        $this->setup($config);
        if(!$this->checkdriver() && !isset($config['skipError'])) {
	        $this->fallback = true;
        }
	    if(class_exists("Memcache")) {
		    $this->instant = new Memcache();
	    } else {
		    $this->fallback = true;
	    }

    }

    function connectServer() {
        $server = $this->config['memcache'];
        if(count($server) < 1) {
            $server = array(
                array("127.0.0.1",11211),
            );
        }

        foreach($server as $s) {
            $name = $s[0]."_".$s[1];
            if(!isset($this->checked[$name])) {
	            try {
		            if(!$this->instant->addserver($s[0],$s[1])) {
			            $this->fallback = true;
		            }

		            $this->checked[$name] = 1;
	            } catch(Exception $e) {
		            $this->fallback = true;
	            }


            }

        }
    }

    function driver_set($keyword, $value = "", $time = 300, $option = array() ) {
	    $this->connectServer();

            // Memcache will only allow a expiration timer less than 2592000 seconds,
            // otherwise, it will assume you're giving it a UNIX timestamp.
            if($time>2592000) {
                $time = time()+$time;
            }
            
	    if(isset($option['skipExisting']) && $option['skipExisting'] == true) {
		    return $this->instant->add($keyword, $value, false, $time );

	    } else {
		    return $this->instant->set($keyword, $value, false, $time );
	    }
    }

    function driver_get($keyword, $option = array()) {

	    $this->connectServer();

	    // return null if no caching
	    // return value if in caching

	    $x = $this->instant->get($keyword);

	    if($x == false) {
		    return null;
	    } else {
		    return $x;
	    }

    }

    function driver_delete($keyword, $option = array()) {
        $this->connectServer();
        $this->instant->delete($keyword);
    }

    function driver_stats($option = array()) {
        $this->connectServer();
        $res = array(
            "info"  => "",
            "size"  =>  "",
            "data"  => $this->instant->getStats(),
        );

        return $res;

    }

    function driver_clean($option = array()) {
        $this->connectServer();
        $this->instant->flush();
    }

    function driver_isExisting($keyword) {
        $this->connectServer();
        $x = $this->get($keyword);
        if($x == null) {
            return false;
        } else {
            return true;
        }
    }


}