Questions tagged [cometd]
The cometd tag has no usage guidance.
59
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52
views
Issue while using CometD in LWC to subscribe for platform event from another ORG
I am trying to subscribe to Platform event using the LWC component.
Platform Event is being published from a different Salesforce ORG and I need to subscribe it in a different Salesforce ORG.
I have ...
- 1
0
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0
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199
views
Streaming API: How to Determine What Channel a User is Subscribed To in LWC or Apex?
I'm trying to determine either on the server or client side if a user is already subscribed to a channel.
The Use Case:
I would like to use a filtered push topic with different filters, but per the ...
- 309
0
votes
0
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95
views
Issue with platform event connection in LWCs dropping
I've developed an LWC that subscribes to a platform event and several message channels. It works as expected most of the time, except when the connection to Salesforce is dropped (or lost) after no ...
- 1,172
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95
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CometD Subscribe not working in experience
I'm trying to listen to a platform event in community and thus implemented CometD.
Outside of community it is working as intended, but in community (and even with my Admin user) I keep getting errors ...
1
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0
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163
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Alternative to Change data capture
Since Change data capture event (CDC) is a paid add-on after 5 objects, what alternatives we have to get notified about change in salesforce object ?
- 111
1
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77
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CometD in Salesforce Mobile?
I have an app using empApi for desktop subscription to a Platform Event, and the version for Communities replaces empApi with cometD.
I'm struggling to find an option for Salesforce Mobile. empApi ...
- 3,490
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0
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23
views
Not able to subscribe to Platform events using cometD in visualforce or force.com site [duplicate]
I am trying to subscribe to a Platform event in force.com site page in visualforce page. I am using cometD to subscribe.Using below code. It works internally in org. But when using the page on site ...
- 173
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403
views
Error: Cannot read properties of undefined (reading 'cometd') when trying to load CometD in LWC
I want to subscribe to events in a community using the CometD library. Unfortunately when loading the script I get following error: "Error: Cannot read properties of undefined (reading 'cometd')&...
- 147
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0
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973
views
How to set up cometD work with Salesforce?
I need help! I am using new community template and I need to show notifications. Community licenses don't support Streaming API, therefor empApi doesn't work. I have to use cometD
I am trying to use ...
- 13
0
votes
1
answer
539
views
403::Unknown client - error in cometd subscription response
Im getting a 403::Unknown client error in the response for my subscription request.
I handshake no problem. Then i use the clientId from the handshake response in my subscription request but i get ...
- 397
4
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answers
99
views
How to handle Platform Event while UI is being rerendered?
Use case:
We have Digital Experience (i.e Community) where at first we perform the action and after it, we redirect to a new page.
This action also publishes Platform Event (Notification) which should ...
- 4,465
2
votes
2
answers
485
views
What CometD streaming channels do communities support?
Is there any documentation that says what streaming channels are allowed for communities?
(Note that in communities lightning-emp-api methods such as isEmpEnabled never resolve but it is possible to ...
- 135k
1
vote
1
answer
1k
views
Calling LWC Javascript function from subscribe () method of cometd result in function undefined
Calling the LWC Javascript function from the subscribe() method of CometD results in function undefined.
Here is the code:
<code>
import { LightningElement, api, track, wire } from 'lwc';
...
- 11
1
vote
1
answer
710
views
Streaming API - How do I automatically queue a retry of a failed messages?
I have an implementation of the streaming api using the .NET CometD client to receive PushTopic changes from a Salesforce platform application. Due to the nature of the process it will in turn ...
- 287
1
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0
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360
views
Salesforce Streaming / CometD Scaling
Since CometD is a client / server implementation, i.e. messages flow directly from SalesForce into subscribed clients, I'm wondering what options there might be regarding horizontal scaling of the ...
- 11
1
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0
answers
656
views
CometD EMP Connector constantly disconnecting after ~6 hours [closed]
I'm using the Java EMP connector to subscribe to a push topic in our Salesforce instance.
The only issue I'm having is that the Connector keeps disconnecting itself after roughly 6 hours (always on ...
- 111
1
vote
1
answer
65
views
How to restrict access to CometD clients to certain Platform Events?
I need to publish multiple events, with different clients subscribing to different type of events. Is there a way to implement policies / permissions to different Channels? So I can restrict clients ...
0
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48
views
Publish Platform Event in SF org and subscribe to it in other org [duplicate]
The requirement is to publish a platform event in one salesforce org and subscribe to it in another salesforce org. In simple words, I need to publish a platform event from a salesforce app/org for an ...
0
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0
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68
views
Cometd does not receive messages on a Filtered Pushtopic for custom profile
I have a lightning cometd. When I use pushtopic without filter for a custom profile it works. When I add filter, it does not receive the messages. If I login as system admin, the filtered pushtopic ...
1
vote
2
answers
2k
views
Publishing an event to Salesforce via CometD
I am trying to create a external client to publish Platform events to Salesforce event bus.
I have used REST API to do the same but I wanted to do it via a true 'Publish'. My guess is that this will ...
- 106
1
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0
answers
430
views
Platform Event Limits regarding CometD and non-CometD clients
As per the Salesforce Documentation regarding Platform Event limits,
in Performance or Unlimited Editions of Salesforce, maximum number of
delivered event notifications within a 24-hour period, ...
- 1,350
6
votes
1
answer
9k
views
Platform Event stuck in OPERATION_ENQUEUED status?
I've created a platform event called Review_Event__e in my sandbox, I have a apex class that publishes an event, the debug logs the event was successfully committed but if I monitor Workbench ...
- 4,888
5
votes
1
answer
548
views
Streaming API Message Reliability and Acknowledgement
How does the Salesforce streaming API ensure message reliability? I understand you can replay events from any replay id within the retention period, but this does not guarantee message delivery.
...
- 51
2
votes
1
answer
156
views
cometD does not work in incognito mode [closed]
this is my code
renderedCallback() {
console.log('render');
if(!this.isUserGuest) {
getSessionId()
.then(result => {
this.sessionId = ...
- 839
1
vote
1
answer
205
views
Is Salesforce classed as a consumer of Platform events?
As the title suggests, I would like to know if Salesforce is classed as a CometD subscriber to Platform events? In the documentation it mentions there is 25K message limit divided by subscribers, is ...
- 4,888
5
votes
1
answer
2k
views
Consuming platform events on AWS
Salesforce and Amazon announced earlier this year there is a partnership to allow easier sync between the two tech stacks. I recall in a YouTube video AWS product engineers will be able to consume ...
- 4,888
0
votes
1
answer
549
views
Getting "has established a session, but no BAYEUX_BROWSER cookie present" When Connecting To Platform Events Channel
I am working with this Ruby library (https://github.com/restforce/restforce#streaming) to connect to Salesforce's Platform Events.
Here is my code:
EM.run do
client.subscribe '/event/My_Event', ...
- 113
2
votes
1
answer
1k
views
Issue with platform event Subscription
A platform event is publishing through an apex trigger and I am trying to subscribe to it using a lightning component, but the lightning component is failing to subscribe every time. It is subscribing ...
1
vote
0
answers
598
views
Authentication error when connecting to the Streaming API
I want to subscribe to PushTopic events from my Open CTI application. But I can't even connect to a cometd server. Help me find the problem with my solution. Or maybe there are other ways to subscribe ...
- 11
2
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0
answers
428
views
CometD & empAPI Issues when subscribing to Platform Events [closed]
As we are using Cometd and platform Events to get the communication happen between Asynchronous Apex and Lightning Component(Lightning Out) it's working fine for some times, and getting the following ...
- 230
1
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495
views
Platform event subscribers on Visualforce page not being called always when platform event is published
We have an implementation in which there are multiple Visualforce pages(seven pages). These pages are using platform events to communicate between each other.
The JavaScript code to subscribe to ...
- 751
6
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0
answers
340
views
lightning:empApi is not working in summer19's sandbox: 403::Unknown client
I am receiving errors in lightning:empApi in the console. It was working fine before summer19 release in the sandbox. It works fine in scratch org. Scratch org is also on summer19.
The error is ...
- 553
1
vote
1
answer
1k
views
How to solve inconsistent 403::Unknown Client error on subscribe when using lightning:empApi
Every other time I attempt to use the lightning:empApi component to subscribe to a Push Topic channel the EMP API component reports error '403::Unknown Client'
After the EMP API component reports the ...
- 757
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0
answers
1k
views
Understanding who is consuming Platform Events, and how much, is it possible?
When a platform event is fired, it is consumed from whichever client is subscribed to its specific channel.
If a single event is fired and consumed by 5 consumers, it will count 5 against the Daily ...
2
votes
0
answers
124
views
Unable to set component attribute on message received from lightning:empAPI
I have the following lightning component implemented and when a message is received I can obtain attribute data from the component but when trying to set an attribute it doesn't seem to set it, the ...
- 1,109
12
votes
1
answer
2k
views
Cannot subscribe to platform events using cometd
I am trying to subscribe to a platform event using cometd. I have asserted that the event is getting published just fine but its subscribing that is an issue.
I have placed console logs in the cometd....
- 221
5
votes
1
answer
3k
views
Unable to subscribe to platform event using emp api
I am trying to subscribe to my platform event using the empapi feature. This feature was added in v44.
I am following the example of the documentation page:
https://developer.salesforce.com/docs/...
- 221
4
votes
0
answers
964
views
Using cometD in visualforce page
I am trying to use CometD with my platform events. I've added a basic use case for the time being for clarity:
* I have a platformevent and a trigger. Whenever a client (custom object) gets edited, a ...
- 221
3
votes
1
answer
2k
views
Subscribe to multiple channels using CometD
I'm trying to subscribe to multiple channels with CometD. I'm using the CometD static resource and syntax as per the Trailhead project: https://trailhead.salesforce.com/projects/workshop-platform-...
- 393
2
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0
answers
170
views
Problem encountered while setting cometdReplayExtension
Good morning my friends,
I'm having a problem trying to set up the dp cometd extension so that a ligthining component can process published events before its subscription. Below is my component, ...
- 21
1
vote
1
answer
145
views
Initialise streaming client on button click, rather than init
I am using Mr Fawcett's the famous streaming component (https://github.com/afawcett/streamingcomponent) with his another great wrapper for deploying Custom Metadata Types (https://github.com/afawcett/...
- 4,016
5
votes
1
answer
2k
views
Platform Event for Guest Community User?
Can platform events be used for the unauthenticated guest user for communities?
Looking to have a public-facing page that displays live statuses without requiring a log in.
Streaming API appears to ...
- 2,614
2
votes
1
answer
2k
views
How to publish Platform Event from aiosfstream python library?
I'm trying to consume/publish Platform Events using aiosfstream python library.
There is a publish() function but I always get an error response:
aiocometd.exceptions.ServerError: ('Publish request ...
- 774
6
votes
2
answers
634
views
Cometd not working in summer 18
We have been using cometd with pushTopic. But we facing an issue an issue in summer 18 org that handshake with cometd is failing in lightning component. if we use lightning component directly in ...
- 3,406
0
votes
1
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447
views
Do I need to re initialize longpolling client with new access token on every connection session timeout?
Sample code how I'm initializing LongPollingTransport to create Bayeux client for subscribing pushtopic ,
LongPollingTransport transport = new LongPollingTransport(options,
httpClient) {...
- 21
1
vote
1
answer
650
views
Streaming API in Lightning Component getCallback error
I'm making a StreamingAPIListener Lightning component, built on this code from @Eric. (Thanks Eric.)
The component loads up cometd from static resources, then runs doInit, which calls setupPushTopic, ...
- 3,490
2
votes
1
answer
425
views
CometD / Streaming API: Firing an event inside of PushTopic's action throws a TypeError exception in Lightning Component
Let's consider a Lightning component with a single button and which uses a CometD / Streaming API to handle some server actions. A button click calls a server-side controller's action which inserts a ...
2
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0
answers
164
views
Salesforce Java Streaming Client filtered subscription
I am subscribing to a push topic from a Salesforce Streaming java client that uses the cometd and bayeux libraries. I found this page which says that filtered subscriptions are supported in streaming ...
10
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2
answers
5k
views
CometD Issues when subscribing to Platform Events
I am using the notification Console Component described in this trailhead:
Subscribe to Platform Events Trailhead
I am able to get it working, and the majority of the time I have no issues.
However, ...
- 1,525
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votes
1
answer
3k
views
"Cannot add property context, object is not extensible" error during CometD handshake in Lightning Component
I'm trying to set up a Lightning component to listen for Platform Events and the above error occurs while CometD is handshaking.
What's interesting is I've tried the code in a Dev org and did not run ...
- 91