[Help] Can't run the Demo Code on external Web Server ?

[chuan_ckc]

Hi DarioCrivelli, thanks for your kind reply.

Have you extended your Data Adapter accordingly?

I've refer to the sample demo adapter and the documentation but not understand

I found a tutorial on NonvisualTable with Command mode from Alessandro, it works quite well for me. Grouping and filtering can be apply since the display can be customize (I have simply tested and works well, should be OK, have to further testing though).

I discovered a thing during testing, where the snapshot will be clear after the web client been idled sometimes (without doing anything, refresh etc.). Do you have any idea on this? Please correct me if I'm wrong. Thanks.

[DarioCrivelli]

So, you have managed to get the desired behavior by resorting to a NonVisualTable, with client side filtering.
Ok. I hope that the data that gets filtered out is not too much, because this could pose scalability issues.

As far as I understand your new problem, we have never observed anything similar (but for the case that the Server is shut down).
Can you please provide us with a more detailed description of what happens?
What do you mean by "snapshot"? This word has a special meaning in Lightstreamer and I'm not sure if you mean a Lightstreamer snapshot or something else.

[chuan_ckc]

Can you please provide us with a more detailed description of what happens?
What do you mean by "snapshot"?

Sorry for the unclear question, just ignore the "snapshot" thingy. What I mean here is once I refresh the page after some period, all the data that suppose to be displayed is all gone.

What I did is after the page has displayed all the pushed data, I just leave it there and after sometimes I refresh the page again (shortest time was around 3+ mins), it appeared to be blank. It shows nothing and the data that I pushed previously didn't show on the page.

[DarioCrivelli]

If I understand well

1. you run your page
2. the page loads and it is filled with pushed data
3. you come back after more than 3 minutes
4. the page is still full of pushed values
5. you hit the browser refresh button
6. the page reloads, but it is not filled with pushed data

Note that the page uses a NonVisualTable, hence everything concerning the page appearance is managed by custom code.
Can you monitor the invocations to "onItemUpdate" on your NonVisualTable and see if there are invocations after the page refresh?

[chuan_ckc]

Hi DarioCrivelli, thanks for your reply. Sorry for the wrong information, is 30+ mins but not 3+ mins.

Can you monitor the invocations to "onItemUpdate" on your NonVisualTable and see if there are invocations after the page refresh?

Yes, they are invocations to "onItemUpdate" after the page refresh. It is invocation every time each row is re-display. Following is the information from the server after refresh the page.

Date: Fri, 26 Jun 2009 10:15:39 GMT
Server: Lightstreamer/3.5 build 1428.4 (Lightstreamer Push Server - www.lightstr
eamer.com) Moderato edition
Content-Type: text/plain; charset=iso-8859-1
Cache-Control: no-store
Cache-Control: no-cache
Pragma: no-cache
Expires: Thu, 1 Jan 1970 00:00:00 GMT
Content-Length: 2476
Connection: Keep-Alive

/*
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if (LS_window.LS_e) {
} else {
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 LS_window.LS_u = LS_window.u;
 LS_window.LS_v = LS_window.v;
 LS_window.LS_n = LS_window.onEos;
 LS_window.LS_o = LS_window.o;
 LS_window.LS_forceReload = LS_window.forceReload;
}
if (LS_window.LS_t) {
LS_window.LS_t("Lightstreamer");
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function error(cod, ph, tbl, msg) {
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function start(sID, addr, kaMs, reqLim, srv) {
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function end() {
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function loop(holdMs) {
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function retry() {
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function s0(lastTopFreq, lastSlowFact, maxBW) {
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function y(secs) {
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var unchangedSignal = {};
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}
function z(tbl) {
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function n(tbl) {
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function r(tbl) {
 LS_window.LS_o(winPhase[tbl], r.arguments);
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function p() {
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window.setPhase = setPhase;
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window.d = d;
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window.r = r;
window.p = p;
window.LS_window = LS_window;
setPhase(1302);start('S784c69a2a845ebefT1539696', null, 30000, 50000, 'Lightstre
amer HTTP Server');s0(0.0,1.0,-1.0);loop(0);end();

*/
26.Jun.09 18:15:39,743 < INFO> Serving request: /lightstreamer/control.html?LS_s
ession=S784c69a2a845ebefT1539696&LS_window=1&LS_win_phase=4&LS_op=add&LS_req_pha
se=8&LS_mode1=COMMAND&LS_id1=NewUser&LS_schema1=key%20command%20sfeCH%20datetime
%20score%20teamaCH%20teambCH%20hhandicap%20ahandicap%20home%20away%20overunder%2
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upid&LS_snapshot1=true&LS_requested_max_frequency1=0.5&LS_unique=1 from 192.168.
1.21:3364
26.Jun.09 18:15:39,743 < INFO> Controlling session: S784c69a2a845ebefT1539696 fr
om 192.168.1.21:3364
26.Jun.09 18:15:39,774 < INFO> Serving request: /lightstreamer/STREAMING_IN_PROG
RESS?LS_session=S784c69a2a845ebefT1539696&LS_phase=1303& from 192.168.1.21:3374
26.Jun.09 18:15:39,774 < INFO> Attaching session: S784c69a2a845ebefT1539696 from
 192.168.1.21:3374
26.Jun.09 18:15:39,774 <TRACE> RELEASING DATA --> HTTP/1.0 200 OK
Date: Fri, 26 Jun 2009 10:15:39 GMT
Server: Lightstreamer/3.5 build 1428.4 (Lightstreamer Push Server - www.lightstr
eamer.com) Moderato edition
Content-Type: text/html; charset=iso-8859-1
Cache-Control: no-store
Cache-Control: no-cache
Pragma: no-cache
Expires: Thu, 1 Jan 1970 00:00:00 GMT
Content-Length: 300000
Connection: close

<!--
  -- LIGHTSTREAMER
  --    Live Web Content Delivery
  --
  -- www.lightstreamer.com - info@lightstreamer.com
  --
  -- Copyright (c) 2004-2008 Weswit s.r.l. All Rights Reserved.
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<html>

<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta http-equiv="Cache-Control" content="no-store">
<meta http-equiv="Cache-Control" content="no-cache">
<meta http-equiv="Pragma" content="no-cache">
<meta http-equiv="Expires" content="Thu, 1 Jan 1970 00:00:00 GMT">
<title>Lightstreamer is pushing...</title>

<script>
var LS_window = parent;
if (window.LS_e || window.e) {
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if (LS_window.LS_e) {
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var winPhase = {};
function setWin(tbl, ph) {
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var clsd = false;
function c(cod, ph, tbl) {
 LS_window.LS_w(cod, ph, tbl);
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function error(cod, ph, tbl, msg) {
 if (tbl != null) {
  LS_window.LS_l(cod, ph, tbl, msg);
 } else {
  LS_window.LS_l(cod, phase, null, msg);
 }
}

function start(sID, addr, kaMs, reqLim, srv) {
 LS_window.LS_e(1, phase, sID, addr, kaMs, reqLim, srv);
}

function end() {
 LS_window.LS_e(4, phase);
}

function loop(holdMs) {
 LS_window.LS_e(2, phase, holdMs);
}

function retry() {
 LS_window.LS_e(3, phase);
}

function s0(lastTopFreq, lastSlowFact, maxBW) {
 LS_window.LS_s(phase, -1, lastTopFreq, lastSlowFact, maxBW);
}
function y(secs) {
 LS_window.LS_s(phase, secs);
}

var unchangedSignal = {};
unchangedSignal.length = -1;
function convert(arr, first) {
 var i;
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  else if (arr[i] == '#') arr[i] = null;
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 }
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}
function d(tbl) {
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 LS_window.LS_v(winPhase[tbl], convert(z.arguments, 2));
}
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 LS_window.LS_n(winPhase[tbl], n.arguments);
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function r(tbl) {
 LS_window.LS_o(winPhase[tbl], r.arguments);
}
function p() {
 LS_window.LS_u(phase, p.arguments);
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</script>
</head>

<body onload="if (! clsd) { retry(); }">
<script>setPhase(1303);</script><script>start('S784c69a2a845ebefT1539696', null,
 2000, 50000);</script><script>s0(0.0,1.0,-1.0);</script>
26.Jun.09 18:15:39,774 <TRACE> RELEASING DATA --> <script>c(6,4,1);setWin(1,4);s
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[DarioCrivelli]

The Server log shows that the Server sends 5 update events, that are supposed to add 5 rows in your browser table.
If you can see 5 invocations to "onItemUpdate" on your NonVisualTable, then Lightstreamer has completed its job successfully.
If your page does not display the received data, your implementation of "onItemUpdate" must be mistaken.

[chuan_ckc]

Hi DarioCrivelli, thanks again for your reply. I think it should be like what you were mentioned, there might be some mistaken on the onItemUpdate handler. I've tested these day, and the web client has been idled for few hours and refresh again, it was able to display the events.

From what I understand, the LightStreamer server keeps every single data (or maybe snapshot) if the web client subscribes as COMMAND mode but not "DELETE" command. Is there is any settings that can make the server clear the data it self after certain time (eg: 5mins/30mins etc.)?

Please correct me if I am wrong. Thanks.