Laravel4-会话在同时请求时消失

Question

I have a kind of shopping basket and I am keeping the content as separate sessions for various reasons.

The problem is, when I send simultaneous requests to the following add function, Laravel's loosing previous, unrelated/different sessions and keeping the last one but it's working fine if I wait for the previous process to finish.

I think the problem is Laravel's session management method, it tries to keep everything in a single file or single field in the database. If so, I don't see any solution for this but here's the code;

public function add($param1, $param2, $param3, $param4){

    sleep(2);

    $results = DB::select("CALL ...(?, ?, ?, ?)", array($param1, $param2, $param3, $param4));
    $sessionName = "basket-item-$param1-$param2-$param3-$param4";
    $selectionIDs = array();
    $status = null;

    if(!Session::has($sessionName)){
        if($results){
            foreach($results as $result){
                $selectionIDs[] = $result->selection_id;
            }
        }

        if($selectionIDs) Session::put($sessionName, $selectionIDs);
        $status = 'new';
    }

    return array('count' => $this->count(), "has_session_this" => Session::has($sessionName), 'session_name' => $sessionName, 'status' => $status);
} 

Count is item count , has_session_this is the response of Session::has($key) and the session_name is the $key

ADD TO BASKET RESPONSE : Object { count=1, has_session_this=true, session_name="basket-item-1-256-7894628-21494", more...}

ADD TO BASKET RESPONSE : Object { count=2, has_session_this=true, session_name="basket-item-1-256-14834686-21494", more...}

ADD TO BASKET RESPONSE : Object { count=3, has_session_this=true, session_name="basket-item-1-256-21132688-21494", more...}

ADD TO BASKET RESPONSE : Object { count=4, has_session_this=true, session_name="basket-item-1-256-3500057-21494", more...}

That's the expected result and if I don't wait for the response;

ADD TO BASKET RESPONSE : Object { count=1, has_session_this=true, session_name="basket-item-1-256-7894628-21494", more...}

ADD TO BASKET RESPONSE : Object { count=1, has_session_this=true, session_name="basket-item-1-256-14834686-21494", more...}

ADD TO BASKET RESPONSE : Object { count=1, has_session_this=true, session_name="basket-item-1-256-21132688-21494", more...}

ADD TO BASKET RESPONSE : Object { count=1, has_session_this=true, session_name="basket-item-1-256-3500057-21494", more...}

Any help, any idea is appreciated.

Answer 1

Looks like a problem with your logic. Has nothing to do with sessions.

If the previous functions have not completed - then the count start at 1. Only if/when the previous function is complete would the count increase.

But you are using $this->count() - so it looks like it might be getting the count on the current session object when you started the function - not the updated count.

If you want to ensure a correct count increment - you need to use

Cache::increment('key')

And your cache driver needs to be Memcache or Redis for it to work. See docs for more info .