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我有一个非常奇怪的问题,使用memcache,php,锁和并发查询。请看看在主要功能:memcache交易和协调
class memcachedata {
public function getdata($key,$params) {
$timeout = 3600;
$mem = $this->memcache;
$expiry = $mem->get(md5($key.$params.'_lock'));
$this->log('GET EXPIRY');
if ($expiry) {
$data = $mem->get(md5($key));
$this->log('DATA GET');
} else
{
$this->log('SET LOCK');
$mem->set(md5($key.$params.'_lock'),'locked',$timeout);
$data = $this->calculate_external_data($key,$params);//curl here
if ($data) {
$mem->set(md5($key.$params),$data,$timeout);
$this->log('DATA UPDATED');
}
}
return $data;
}
}
调试信息:
00:00:00 GET EXPIRY
00:00:00 GET DATA
00:00:00 GET EXPIRY
00:00:00 SET LOCK
00:00:00 DATA UPDATED
00:00:01 GET EXPIRY
00:00:01 GET DATA
这是正确的结果。
问题是,当该功能被调用从其他功能或由多个用户多次在像一个(或)单独的会话:
function getuserinfo($username,$message){
return $this->getdata('users',"'$username','$message'");
}
DEBUG INFO:
00:00:00 GET EXPIRY
00:00:00 SET LOCK
00:00:00 DATA UPDATED
00:00:00 GET EXPIRY
00:00:00 SET LOCK
00:00:00 DATA UPDATED
00:00:03 GET EXPIRY
00:00:03 SET LOCK
00:00:03 DATA UPDATED
为什么功能的GetData没有看到锁?现在是开始使用MQ的时候了吗?