PHP中使用Memache作为进程锁的操作类分享
PHP中使用Memache作为进程锁的操作类分享
这篇文章主要介绍了PHP中使用Memache作为进程锁的操作类分享,本文直接给出类实现代码以及应用示例,需要的朋友可以参考下
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// 使用Memache 作为进程锁
class lock_processlock{
// key 的前缀 protected $sLockKeyPre; // 重试间隔 protected $iLockRetryInterval; //重试次数 protected $iLockRetryCount; //锁的过期时间 protected $iLockCacheTimeout; // 锁过期后的回调函数 protected $onLockTimeoutFunc; // memache 的实例 protected $oMemcache; // 存储memcache失败后重试次数 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){ // 如果加锁不成功则调用回调函数,如果没有回调函数,使用本类中所带的 $onLockTimeoutFunc ='onLockTimeout' ; } $this->onLockTimeoutFunc = $onLockTimeoutFunc; }
/** 连接memcache 服务器 */ 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 ; $iiMemcacheRetryCount){ $bRes = $this->oMemcache->add($sKey, $sValue, $iTimeout); if($bRes){ return true ; } // 如果加锁不成功,sleep 之后,从新加锁 usleep($this->iLockRetryInterval*1000);
} return false ;
}
/* 加锁 */ public function lock($sLockID){
$oMemcache = $this->connect(); $sKey = $this->sLockKeyPre . $sLockID;
// 加锁如果不成功可以多试几次
for($i = 0 ; $i iLockRetryCount ; $i++){
// 这里设置value 的值可以随便设置 if($this->addMemcache($sKey,'1',$this->iLockCacheTimeout)){ return true ; }
// 如果加锁不成功,sleep 之后,从新加锁 usleep($this->iLockRetryInterval*1000);
}
// 若还不成功,则加锁失败,调用回调函数,.也就是失败后需要处理的操作 if(is_callable($this->onLockTimeoutFunc)){ // 调用函数 call_user_func($this->onLockTimeoutFunc); }
}
/* 解锁操作 */ public function unlock($sLockID){
$oMemcache = $this->connect(); $sKey = $this->sLockKeyPre . $sLockID; // 删除key return $this->oMemcache->delete($sKey);
}
/** 如果加锁不成功,则执行如下操作 */ public function onLockTimeout(){
echo ("加锁超时"); }
}
// 应用实例
$oLock = new lock_processlock(); $lockResource = "test"; // 加锁 $oLock->lock($lockResource); // 解锁 |

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