When running icemobilespring demo the blocking connection is started reliably when the "Cloud Push" page is accessed.

Also, double checking the blocking connection behaviour with a slightly modified icepush-basic application confirms that the connection is started right away after ice.push.register function is invoked.

Can be easily reproduced as follows:

Ajax Push appears to work when the Cloud Push demo is accessed first. The following procedure shows the problem in Chrome on the Mac.

(1) Load

http://localhost:8080/icemobilespring

Click on Buttons

Click on Cloud Push

• test

repeat above (1), perhaps with a delay so that the listen interval is exceeded.

Shouldn't we fix the error that shows up in console before blaming ICEpush?

Uncaught TypeError: Object #<Text> has no method 'getBoundingClientRect'
WombatUtils.getElementRect
M
U
Y
n
d.callbackWrapper
jQuery.fn.extend.append jquery.js:389
jQuery.fn.extend.domManip jquery.js:400
jQuery.fn.extend.append jquery.js:389
jQuery.fn.extend.html jquery.js:393
jQuery.fn.extend.load.jQuery.ajax.complete jquery.js:472
jQuery.extend._Deferred.deferred.resolveWith jquery.js:67
done jquery.js:497
jQuery.ajaxTransport.send.callback

Looks like the error is triggered even without jQuery. I will investigate further.

The error shown above was triggered by a Chrome extension. Most probably the extension has localStorage registered callbacks the fail to run properly.

Managed to reproduce this issue reliably when running icemobilespring demo locally.

While debugging the ICEpush code I could observe that the monitor that ICepush starts (using setInterval) to check if pushIds are registered is not running anymore after the "Cloud Push" link is clicked.

After some Google search I learned about issue http://bugs.jquery.com/ticket/9678. When "Cloud Push" link is clicked this registered callback actually runs:

MvcUtil.addClickLinkHandler = function(link, updateRegion){
    $(link).click( function(e) {
        if( window.history && window.history.pushState ){
            $('#menu').find('a').each( function(){
                this.className = '';
            });
            $(updateRegion).load(link.href, function(){ 
                ice.mobi.sizePagePanelsToViewPort();
                $('html, body').animate({ scrollTop:0 }, 400);
            });
            history.pushState({ src: link.href }, null, link.href);
            e.preventDefault();
        }
      });
}

When line

$('html, body').animate({ scrollTop:0 }, 400);

is removed the blocking connection starts every time.

It seems that the animation code stops pseudo-threads started with setInterval, even if they are not started by the animation code.

I was able to confirm that by using jQuery 1.7.1 (included in the demo) this issue goes away.

So, in order to fix this issue we either make the sample use jQuery 1.7.1 (higher that 1.6.3 anyway) or remove the animation triggered by the 'click' callback.

Should ICEpush use a setTimeout "loop" rather than setInterval to guard against this? For instance, other user-level code could potentially cause the same problem. (It's not clear to me how jQuery disrupts the ICEpush setInterval callback – is there only one per window?)

There's one setInterval setup per browser in this case. But if access the site in one window that window will own the blocking connection as well (with its setInterval started).

Are you sure that switching to setTimeout would not cause other libraries to cause us problems? Both setTimeout and setInterval are equally fundamental in Javascript.

I'm not sure – I don't see how it's possible for jQuery to interfere with our existing setInterval.

Philip, please upgrade the jQuery version in the demo for EE.

As Mircea mentioned, switching to setTimeout is unlikely to help – the bug is that jQuery is killing the timer based on the guessable process ID (such as id = 1).

IE 8 compatibility is still desired, so jQuery 2 is too recent an upgrade.

Upgraded jquery version to 1.9.1

Revision: 36224
Author: philip.breau
Date: June-13-13 3:54:50 PM
Message:
MOBI-764 Ensure push connection is active when pushIDs are registered

Modified : /icemobile/trunk/icemobile/samples/jsp/icemobilespring/src/main/webapp/WEB-INF/views/inc/head.jsp
Modified : /icemobile/trunk/icemobile/samples/jsp/icemobilespring/src/main/webapp/WEB-INF/views/template-small-android.jsp
Modified : /icemobile/trunk/icemobile/samples/jsp/icemobilespring/src/main/webapp/resources/camera.html
Added : /icemobile/trunk/icemobile/samples/jsp/icemobilespring/src/main/webapp/resources/jquery/jquery-1.9.1.min.js
Added : /icemobile/trunk/icemobile/samples/jsp/icemobilespring/src/main/webapp/resources/jquery.mobile-1.3.1
Added : /icemobile/trunk/icemobile/samples/jsp/icemobilespring/src/main/webapp/resources/jquery.mobile-1.3.1/images
Added : /icemobile/trunk/icemobile/samples/jsp/icemobilespring/src/main/webapp/resources/jquery.mobile-1.3.1/images/ajax-loader.gif
Added : /icemobile/trunk/icemobile/samples/jsp/icemobilespring/src/main/webapp/resources/jquery.mobile-1.3.1/images/icons-18-black.png
Added : /icemobile/trunk/icemobile/samples/jsp/icemobilespring/src/main/webapp/resources/jquery.mobile-1.3.1/images/icons-18-white.png
Added : /icemobile/trunk/icemobile/samples/jsp/icemobilespring/src/main/webapp/resources/jquery.mobile-1.3.1/images/icons-36-black.png
Added : /icemobile/trunk/icemobile/samples/jsp/icemobilespring/src/main/webapp/resources/jquery.mobile-1.3.1/images/icons-36-white.png
Added : /icemobile/trunk/icemobile/samples/jsp/icemobilespring/src/main/webapp/resources/jquery.mobile-1.3.1/jquery.mobile-1.3.1.css
Added : /icemobile/trunk/icemobile/samples/jsp/icemobilespring/src/main/webapp/resources/jquery.mobile-1.3.1/jquery.mobile-1.3.1.js
Added : /icemobile/trunk/icemobile/samples/jsp/icemobilespring/src/main/webapp/resources/jquery.mobile-1.3.1/jquery.mobile-1.3.1.min.css
Added : /icemobile/trunk/icemobile/samples/jsp/icemobilespring/src/main/webapp/resources/jquery.mobile-1.3.1/jquery.mobile-1.3.1.min.js
Added : /icemobile/trunk/icemobile/samples/jsp/icemobilespring/src/main/webapp/resources/jquery.mobile-1.3.1/jquery.mobile-1.3.1.min.map
Added : /icemobile/trunk/icemobile/samples/jsp/icemobilespring/src/main/webapp/resources/jquery.mobile-1.3.1/jquery.mobile.structure-1.3.1.css
Added : /icemobile/trunk/icemobile/samples/jsp/icemobilespring/src/main/webapp/resources/jquery.mobile-1.3.1/jquery.mobile.structure-1.3.1.min.css
Added : /icemobile/trunk/icemobile/samples/jsp/icemobilespring/src/main/webapp/resources/jquery.mobile-1.3.1/jquery.mobile.theme-1.3.1.css
Added : /icemobile/trunk/icemobile/samples/jsp/icemobilespring/src/main/webapp/resources/jquery.mobile-1.3.1/jquery.mobile.theme-1.3.1.min.css
Modified : /icemobile/trunk/icemobile/samples/jsp/icemobilespring/src/main/webapp/resources/microphone.html

Revision: 36225
Author: philip.breau
Date: June-13-13 4:10:04 PM
Message:
MOBI-764 Ensure push connection is active when pushIDs are registered

• upgrade jq to 1.9.1 to avoid killing the setInterval process

  ---

  Modified : /icemobile/trunk/icemobile/samples/jsp/mvc-mediacast/src/main/webapp/WEB-INF/jsp/head.jsp
  Added : /icemobile/trunk/icemobile/samples/jsp/mvc-mediacast/src/main/webapp/resources/javascript/jquery-1.9.1.min.js

Can no longer reproduce in mvc-mediacast or icemobilespring demos