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//Use Memache as process lock
class lock_processlock{
//key prefix protected $sLockKeyPre; //Retry interval protected $iLockRetryInterval; //Number of retries protected $iLockRetryCount; //Lock expiration time protected $iLockCacheTimeout; //Callback function after lock expiration protected $onLockTimeoutFunc; //Instance of memache protected $oMemcache; //Number of retries after failure to store memcache protected $iMemcacheRetryCount;
public function __construct ($onLockTimeoutFunc=NULL) { $aLockConfig = get_config('', 'lock'); $this->sLockKeyPre = self::LOCK_KEY_PRE; $this->iLockRetryInterval = self::LOCK_RETRY_INTERVAL; $this->iLockRetryCount =self::LOCK_RETRY_COUNT; $this->iLockCacheTimeout = self::LOCK_CACHE_TIMEOUT; $this->iMemcacheRetryCount = self::LOCK_CACHE_TIMEOUT; if(!$onLockTimeoutFunc){ // If the lock is unsuccessful, call the callback function. If there is no callback function, use the provided in this class.$onLockTimeoutFunc ='onLockTimeout' ; } $this->onLockTimeoutFunc = $onLockTimeoutFunc; }
/** Connect memcache server */ public function connect() { if (! isset ( $this->oMemcache )) { $this->oMemcache = new Memcache (); $this->oMemcache->connect ( '127.0.0.1', 11211 ); } return $this->oMemcache; }
/* Add key to MeMcache */ public addMemcache($sKey, $sValue, $iTimeout){
for($i= 0 ; $iiMemcacheRetryCount){ $bRes = $this->oMemcache->add($sKey, $sValue, $iTimeout); if($bRes){ return true ; } // If the lock is unsuccessful, re-lock after sleep usleep($this->iLockRetryInterval*1000);
} return false ;
}
/* Lock */ public function lock($sLockID){
$oMemcache = $this->connect(); $sKey = $this->sLockKeyPre . $sLockID;
// If the lock is unsuccessful, you can try a few more times
for($i = 0 ; $i iLockRetryCount ; $i ){
// The value set here can be set at will if($this->addMemcache($sKey,'1',$this->iLockCacheTimeout)){ return true ; }
// If the lock is unsuccessful, re-lock after sleep usleep($this->iLockRetryInterval*1000);
}
// If it is still unsuccessful, the locking fails and the callback function is called, which is the operation that needs to be processed after the failure if(is_callable($this->onLockTimeoutFunc)){ //Call function call_user_func($this->onLockTimeoutFunc); }
}
/* Unlock operation */ public function unlock($sLockID){
$oMemcache = $this->connect(); $sKey = $this->sLockKeyPre . $sLockID; //Delete key return $this->oMemcache->delete($sKey);
}
/** If the locking is unsuccessful, perform the following operations */ public function onLockTimeout(){
echo ("lock timeout"); }
}
//Application Example
$oLock = new lock_processlock(); $lockResource = "test"; // Lock $oLock->lock($lockResource); // Unlock |
