Set cache lock when concurrency is implemented using memcached

Take advantage of the Add () method in memcached.

Memcached:add ($key) returns TRUE on success, or FALSE on failure. Returns False if this key already exists.

Use the atomicity of add to determine whether business code needs to be executed.

/** *  @param  null  $key  *  *  @author  [email protected] * /public function add_cache ($key =null) {     $memcacheClass  = new  Memcached ();     $data  =  $memcacheClass->get ($key);     if ( !  $data)  {        do {              $write _key =  ' write ';             if ($memcacheClass->add ($write _key,  $write _key, 10 *  60))  {                 //  Lock successfully, perform business operations                   $data  =  $model->get ();                  $memcacheClass->set ($key,  $data,  30 * 60); //  storing data in cache                   $memcacheClass->delete ( $write _key);                 $ Is_retry = false;            } else  {                //   If the lock is unsuccessful, wait for a period of time before retrying                  sleep (Ten);                  $is _retry = true;             }        } while ($is _retry);     }}

Set cache lock when concurrency is implemented using memcached