I have a VF page let's call it Aggregator.

I display Project__c records on this page in a table, each row has a 'Refresh' icon on click of which a batch runs.

The batch then does some calculation on all the child records of that Project__c record and then updates a Value__c field on Project__c record in the finish() method of the batch.

I created a PushTopic:

PushTopic pushTopic = new PushTopic();
pushTopic.Name = 'AggregateUpdate';
pushTopic.Query = 'SELECT Id, Value__c FROM Project__c WHERE Type__c = \'Aggregated\'';
pushTopic.ApiVersion = 43.0;
pushTopic.NotifyForOperationUpdate = true;
pushTopic.NotifyForFields = 'Referenced';
insert pushTopic;

In my VF page, I have subscribed to the PushTopic:

function loadCometD() {
        url: URL,
        requestHeaders: {Authorization: 'OAuth ' + SESSION_ID}

    j$.cometd.subscribe('/topic/AggregateUpdate', function(message) {
        console.log('========== Response :: ' + JSON.stringify(message.data));
        j$('#' + message.data.sobject.Id).find('a').addClass('disableCursor');
        j$('#' + message.data.sobject.Id).find('a').find('.slds-icon').attr('class', 'disableIcon');

loadCometD() is called onLoad() of the VF page

Once the field is updated the icon is greyed out and is disabled. This is how it should work.

Now, If I open this same page on two different machines and run the batch from machine #1 the batch runs fine and updates the value__c field. This is the response I get on machine #1:

========== Response :: {"event":{"createdDate":"2018-07-13T10:19:07.346Z","replayId":941,"type":"updated"},"sobject":{"Value__c":"2034450","Id":"a0L6F00001EG8CkUAL"}}

========== Response :: {"event":{"createdDate":"2018-07-13T10:19:22.546Z","replayId":942,"type":"updated"},"sobject":{"Value__c":"2034450","Id":"a0L6F00001EG8CkUAL"}}

Shouldn't the second response be displayed on machine #2? The icon on #1 is greyed out and is disabled while nothing has changed on #2.

I want to change the icon on all the machines accessing this Aggregator page. How can I achieve this?

  • Are you using the same user (session) on machine #2? – Christian Szandor Knapp Jul 17 '18 at 10:08
  • I have tried this with same and different users as well. @ChristianSzandorKnapp – d_k Jul 17 '18 at 12:18
  • What if you update the Project__c records independently from the two Visualforce pages? The PushTopic should still notify any subscribers. – Daniel Ballinger Jul 21 '18 at 10:05
  • Another verification to perform, use Workbench Queries > Streaming Push Topics to subscribe to the channel. That will tell you if it is your push topic or the Visualforce pages causing the problems. – Daniel Ballinger Jul 21 '18 at 10:09
  • @DanielBallinger If I update the same Project__c from the individual pages it does notify the subscribers. – d_k Jul 22 '18 at 9:19

Based of the conversation in the comments I'd say there is something wrong with the cometD setup in the Visualforce pages.

That causing the PushTopic to fire outside of the Visualforce page doesn't show an update on either Visualforce page suggests that neither is receiving the updates as expected.

You could further verify this using something like Workbench to subscribe to the PushTopic channel. See Workbench Queries > Streaming Push

The SessionID that the Visualforce pages are using seems like one possible culprit. Check what value {!$Api.Session_ID} is returning for the Session Id in the Visualforce pages. I assume you are using the same user on both machines. If not, it might be an issue with user permissions.

| improve this answer | |
  • The sessionID's are different for both users, both the users have same profile. – d_k Jul 24 '18 at 2:12
  • Is it always the same user who can't get the cometd updates? – Daniel Ballinger Jul 24 '18 at 2:58
  • Not really, its inconsistent. – d_k Jul 24 '18 at 4:16

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