PHP中使用Memache作為進程鎖的操作類分享_php技巧

<?php// 使用Memache 作為進程鎖 class lock_processlock{// key 的首碼protected $sLockKeyPre;// 稍候再試 protected $iLockRetryInterval;//重試次數  protected $iLockRetryCount;//鎖的到期時間 protected $iLockCacheTimeout; // 鎖到期後的回呼函數 protected $onLockTimeoutFunc;// memache 的執行個體 protected $oMemcache;// 儲存memcache失敗後重試次數  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){// 如果加鎖不成功則調用回呼函數,如果沒有回呼函數,使用本類中所帶的 $onLockTimeoutFunc ='onLockTimeout' ; }  $this->onLockTimeoutFunc = $onLockTimeoutFunc; }/**串連memcache 伺服器 */public function connect() {if (! isset ( $this->oMemcache )) {$this->oMemcache = new Memcache ();$this->oMemcache->connect ( '127.0.0.1', 11211 );}return $this->oMemcache;}/*向MeMcache中添加 key*/public addMemcache($sKey, $sValue, $iTimeout){for($i= 0 ; $i<$this->iMemcacheRetryCount){$bRes = $this->oMemcache->add($sKey, $sValue, $iTimeout);if($bRes){return true ; }// 如果加鎖不成功,sleep 之後,從新加鎖usleep($this->iLockRetryInterval*1000);}return false ; }/*加鎖 */public function lock($sLockID){$oMemcache = $this->connect(); $sKey = $this->sLockKeyPre . $sLockID;// 加鎖如果不成功可以多試幾次 for($i = 0 ; $i <$this->iLockRetryCount ; $i++){// 這裡設定value 的值可以隨便設定 if($this->addMemcache($sKey,'1',$this->iLockCacheTimeout)){return true ; }// 如果加鎖不成功,sleep 之後,從新加鎖usleep($this->iLockRetryInterval*1000);}// 若還不成功,則加鎖失敗,調用回呼函數,.也就是失敗後需要處理的操作 if(is_callable($this->onLockTimeoutFunc)){// 調用函數 call_user_func($this->onLockTimeoutFunc); }}/*解鎖操作 */public function unlock($sLockID){$oMemcache = $this->connect(); $sKey = $this->sLockKeyPre . $sLockID;// 刪除keyreturn $this->oMemcache->delete($sKey);}/**如果加鎖不成功,則執行如下操作 */ public function onLockTimeout(){  echo ("加鎖逾時"); }  }// 應用執行個體  $oLock = new lock_processlock(); $lockResource = "test"; // 加鎖 $oLock->lock($lockResource); // 解鎖 $oLock->unlock($lockResource);