我正在开发带有实时竞价系统的现场拍卖网站。当用户对项目出价时，我正在使用LONG POLLING 。我选择了长轮询，因为WebSockets还没有得到很好的支持，而且NODEJS对我来说现在实现起来很复杂。所以我坚持使用这个简单的 ajax 长轮询，它适用于大约五个投标。
所以问题是：在 1 秒的时间间隔内，投标对 5-6 个项目的投标非常有效（我从 server-ajax 获得即时响应），但是在投标按钮上的第 7 次（点击）这个响应长轮询会挂起大约 16-22 秒然后完成请求。最后，所有内容都在数据库中更新并完成，但每 5-6 次出价响应/ajax 调用挂起约 16-22 秒。
怎样才能减少这个时间，无论用户出价多少次，一切都应该顺利，没有滞后......
我在 localhost/wamp 上使用 Apache/PHP/MySql
我的代码： index.php
<script type="text/javascript" charset="utf-8">
var old_timestamp = <?php echo $old_timestamp;?>; //here i'm echoing last timestamp of auction
function waitForMsg(){
jq.ajax({
type: "POST",
url: "http://localhost/bid/comet/poll.php",
data: {"old_timestamp" : old_timestamp},
async: true,
cache: false,
success: function(data){
var json = eval('(' + data + ')');
if(json['msg'] != "") {
jq('#comet_display').html(json['msg']); //here I show ID of which auction item was bidded
}
old_timestamp = json['old_timestamp'];
setTimeout('waitForMsg()',100);
},
error: function(XMLHttpRequest, textStatus, errorThrown){
setTimeout('waitForMsg()',1000);
}
});
}
jq(window).load(function(){
waitForMsg();
jq("#a_loader").show();
var url = "http://localhost/bid/auctions-ajax"; // the script where you handle the form input.
jq.ajax({
type: "POST",
url: url,
data: {au978 : true},
async:false, //to sem dodal za časovni zamik
success: function(data)
{
jq("#a_loader").hide();
jq("#show-category").html(data); // show response from the php script.
},
error: function(result) {
jq("#show-category").html("Sorry, something went wrong. Please try again later.");
}
});
});
function bid(id){
var url = "http://localhost/bid/comet/update-auction.php"; // the script where you handle the form input.
var user_id=<?php echo $user_id;?>; //user id from session
jq.ajax({
type: "POST",
url: url,
data: {"auct_id" : id, "user_id" : user_id}, // serializes the form's elements.
success: function(data)
{
//it updates in user table its remaining number of bids
},
error: function(XMLHttpRequest, textStatus, errorThrown){
alert("Something went wrong. Click OK to refresh.");
}
});
}
</script>
投票.php
<?php
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
require_once($_SERVER['DOCUMENT_ROOT'] . 'bid/include/DEFINES.php');
require_once(CLASS_AUCTION);
require_once(CLASS_DB);
$a=new Auction();
$old_timestamp = $_POST['old_timestamp'];
$bidded_id=0;
$db=DB::getInstance();
$sql="SELECT timestamp, id FROM auction ORDER BY timestamp DESC LIMIT 1"; //desno doda tabelo kategorija
$stmt=$db->db->prepare($sql) or die("Prepare Error");
$stmt->execute();
$result2=$stmt->fetchAll(PDO::FETCH_ASSOC);
foreach ($result2 as $rez){
$current_timestamp=$rez['timestamp'];
$bidded_id=$rez['id'];
}
$stmt->closeCursor();
while($current_timestamp <= $old_timestamp){
usleep(1000);
clearstatcache();
$db=DB::getInstance();
$sql="SELECT timestamp, id FROM auction ORDER BY timestamp DESC LIMIT 1";
$stmt=$db->db->prepare($sql) or die("Prepare Error");
$stmt->execute();
$result=$stmt->fetchAll(PDO::FETCH_ASSOC);
foreach ($result as $rez){
$current_timestamp=$rez['timestamp'];
$bidded_id=$rez['id'];
}
$stmt->closeCursor();
}
$response = array();
$response['msg'] = 'BID na avkciji: '.$bidded_id;
$response['old_timestamp'] = $current_timestamp;
echo json_encode($response);
}else{
require_once($_SERVER['DOCUMENT_ROOT'] . 'bid/errors/404.html');
}
?>
和 update-auction.php
<?php
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
require_once($_SERVER['DOCUMENT_ROOT'] . 'bid/include/DEFINES.php');
require_once(CLASS_AUCTION);
require_once(CLASS_USER);
require_once(CLASS_DB);
$u=new User();
$a=new Auction();
$auction_id=$_POST['auct_id'];
$user_id=$_POST['user_id'];
$date = new DateTime();
$timestamp=$date->getTimestamp();
$a->updateAuction($auction_id,$user_id,$timestamp/*,$bid_price,$bids_spent,$total_paid*/);
$u->updateUserBids($user_id);
}else{
require_once($_SERVER['DOCUMENT_ROOT'] . 'bid/errors/404.html');
}
?>
感谢您查看我的问题！