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PHP中使用Memache作为进程锁的操作类分享
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PHP中使用Memache作为进程锁的操作类分享

Jun 13, 2016 am 09:08 AM
php use share operate of kind process Lock

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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