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我有一個非常奇怪的問題,使用memcache,php,鎖和併發查詢。請看看在主要功能:memcache交易和協調
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 $data;
}
}
調試信息:
00:00:00 GET EXPIRY
00:00:00 GET DATA
00:00:00 GET EXPIRY
00:00:00 SET LOCK
00:00:00 DATA UPDATED
00:00:01 GET EXPIRY
00:00:01 GET DATA
這是正確的結果。
問題是,當該功能被調用從其他功能或由多個用戶多次在像一個(或)單獨的會話:
function getuserinfo($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
爲什麼功能的GetData沒有看到鎖?現在是開始使用MQ的時候了嗎?