<?php
/**
*
* Setup:
*
edit the singleton() metod
and define the list of memcached servers in a 2-d array
in the format
array(
array('192.168.0.1'=>'11211'),
array('192.168.0.2'=>'11211'),
);
*
*
* Usage:
*
<?php
//include the class name
include ('memcache.class.php');
//store the variable
Cache::set('key','abc');
//increment/decrement the integer value
Cache::increment('key');
Cache::decrement('key');
//fetch the value by it's key
echo Cache::get('key');
//delete the data
echo Cache::delete('key');
//Clear the cache memory on all servers
Cache::flush();
?>
Cache::replace() and Cache::add are implemented also.
More information can be obtained here:
http://www.danga.com/memcached/
http://www.php.net/memcache
*/
/**
* The class makes it easier to work with memcached servers and provides hints in the IDE like Zend Studio
* @author Grigori Kochanov http://www.grik.net/
* @version 1
*
*/
class Cache {
/**
* Resources of the opend memcached connections
* @var array [memcache objects]
*/
protected $mc_servers = array();
/**
* Quantity of servers used
* @var int
*/
protected $mc_servers_count;
static $instance;
/**
* Singleton to call from all other functions
*/
static function singleton(){
//Write here where from to get the servers list from, like
// global $servers
$servers = _Config::$memcache_servers;
self::$instance ||
self::$instance = new Cache($servers);
return self::$instance;
}
/**
* Accepts the 2-d array with details of memcached servers
*
* @param array $servers
*/
protected function __construct(array $servers){
if (!$servers){
trigger_error('No memcache servers to connect',E_USER_WARNING);
}
for ($i = 0, $n = count($servers); $i < $n; ++$i){
( $con = memcache_pconnect(key($servers[$i]), current($servers[$i])) )&&
$this->mc_servers[] = $con;
}
$this->mc_servers_count = count($this->mc_servers);
if (!$this->mc_servers_count){
$this->mc_servers[0]=null;
}
}
/**
* Returns the resource for the memcache connection
*
* @param string $key
* @return object memcache
*/
protected function getMemcacheLink($key){
if ( $this->mc_servers_count <2 ){
//no servers choice
return $this->mc_servers[0];
}
return $this->mc_servers[(crc32($key) & 0x7fffffff)%$this->mc_servers_count];
}
/**
* Clear the cache
*
* @return void
*/
static function flush() {
$x = self::singleton()->mc_servers_count;
for ($i = 0; $i < $x; ++$i){
$a = self::singleton()->mc_servers[$i];
self::singleton()->mc_servers[$i]->flush();
}
}
/**
* Returns the value stored in the memory by it's key
*
* @param string $key
* @return mix
*/
static function get($key) {
return self::singleton()->getMemcacheLink($key)->get($key);
}
/**
* Store the value in the memcache memory (overwrite if key exists)
*
* @param string $key
* @param mix $var
* @param bool $compress
* @param int $expire (seconds before item expires)
* @return bool
*/
static function set($key, $var, $compress=0, $expire=0) {
return self::singleton()->getMemcacheLink($key)->set($key, $var, $compress?MEMCACHE_COMPRESSED:null, $expire);
}
/**
* Set the value in memcache if the value does not exist; returns FALSE if value exists
*
* @param sting $key
* @param mix $var
* @param bool $compress
* @param int $expire
* @return bool
*/
static function add($key, $var, $compress=0, $expire=0) {
return self::singleton()->getMemcacheLink($key)->add($key, $var, $compress?MEMCACHE_COMPRESSED:null, $expire);
}
/**
* Replace an existing value
*
* @param string $key
* @param mix $var
* @param bool $compress
* @param int $expire
* @return bool
*/
static function replace($key, $var, $compress=0, $expire=0) {
return self::singleton()->getMemcacheLink($key)->replace($key, $var, $compress?MEMCACHE_COMPRESSED:null, $expire);
}
/**
* Delete a record or set a timeout
*
* @param string $key
* @param int $timeout
* @return bool
*/
static function delete($key, $timeout=0) {
return self::singleton()->getMemcacheLink($key)->delete($key, $timeout);
}
/**
* Increment an existing integer value
*
* @param string $key
* @param mix $value
* @return bool
*/
static function increment($key, $value=1) {
return self::singleton()->getMemcacheLink($key)->increment($key, $value);
}
/**
* Decrement an existing value
*
* @param string $key
* @param mix $value
* @return bool
*/
static function decrement($key, $value=1) {
return self::singleton()->getMemcacheLink($key)->decrement($key, $value);
}
//class end
}
?>
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