How to get user that published item

Smack Smack Dev
1

Hi all,

i’m new to this forum and xmpp in general so this question might sound silly to you all, bur here it goes anyway.

I’m playing with smack pusub functionality and cant figure out how to get the user (jid or username) of client that published item to the node.

On subscriber side i have

PubSubManager mgr = new PubSubManager(connection,"pubsub.simonraz");
    LeafNode leaf = (LeafNode)mgr.getNode("testNode");
    leaf.addItemEventListener(new ItemEventListener<Item>(){
     public void handlePublishedItems(ItemPublishEvent<Item> event) {
    System.out.println("received message " + event);
    System.out.println(event.getItems().get(0).toXML());
       }});
       leaf.subscribe(username+"@simonraz");

There doesn’t seem to be anything like Item.getFrom or Item.getReplyTo or something similar.

Thanks in advance,

Simon

2

It isn’t part of the item that is published. The only way to get it would be to make the users identity part of the actual payload. There is no getFrom() or getReplyTo() since you are communicating with the pubsub node, not another user.

This is typical of most pubsub type systems, as a common feature is to disconnect the consumers from the producers.

3

Thank you very much for your answer. It’s what I expected, just wanted to double check.

What i’m actualy proofing is using xmpp for cluster management. There are many usecases where one would like to invoke same ‘admin’ operation across whole cluster, like setting log level to debug for exemple, reset cache, etc etc. I find lightweight xmpp pubsub model very suitable for such usecases. Most of those operations ‘fire and forger’ style (dont’t return anything), but there are edge usecases where client that published requests expects some sort of result from subscribers (like collect stats data,etc…).

How would this feature be best imlepented using smack? I was thinking of something like : client that sends publishes request creates ‘temp’ node and publishes the name of the node as part of request. Upon the receipt of request subsciber executes operation and publishes result to the node whose name he received in request. The client that published the request knows how many subscribers there are for the are and how many response messages to expect. Are there any patterns for such usecases using xmpp pubsub?

Thanks in advance,

Simon

4

Sounds doable and is not that uncommon in the JMS realm where you can actually include a replyTo destination with the original message that was posted.

This is a fairly common pattern in that regard.

Good luck.

5

Hi,

i try to implement this case, but got stuck at the begining .

Hoe do I get number of subsribers to a node?

PubSubManager mgr = new PubSubManager(connection,“pubsub.simonraz”);

LeafNode leaf = (LeafNode)mgr.getNode(“testNode7”);

System.out.println("no subs "+leaf.getSubscriptions().size());

leaf.getSubscriptions() return empty list.

Thanks in advance,

Simon

6

That looks right, but is the user the admin and has anyone actually subscribed?

Add a leaf.subscribe() before you do a getSubscriptions() and see what your result is.

7

Hi,

if I add leaf.subscribe(), getSubscriptions() returns only 1 subscription belonging to current user ( the one that was just created). Subscriptions from other users are still invisible. I’m using openfire 3.7.0.

Thanks,

Simon

8

Sorry, but that feature is not implemented yet.

It is logged as SMACK-287.

9

I see. Any other way to get the number of subsribers to particular node?

Simon

10

You can send the appropriate packet yourself.

I never finished that part of the spec myself since I didn’t need it at the time when I wrote the API and simply didn’t have the time to do it all. As a whole,that part of the spec requires a little more than just a simple request to get all subscribers, since it also needs to handle requests to subscribe to the node as well.

On the other hand, if you simply need to get the all of the current subscribers, you can simply create the packet and send it. You can use the SyncPacketSend.getReply() to easily make a synchronous request.

11

Hi,

been involved in another project, so a bit late response.

I implemented request as specified in http://xmpp.org/extensions/xep-0060.html#owner-subscriptions-retrieve , but the server returns empty list

request

<iq id="12388" to="pubsub.simonraz" from="testuser2@simonraz/Smack" type="get"> <pubsub xmlns='http://jabber.org/protocol/pubsub#owner'><affiliations node='testNode99'/></pubsub></iq>

response

<iq id="12388" to="testuser2@simonraz/Smack" from="pubsub.simonraz" type="result"><pubsub xmlns="http://jabber.org/protocol/pubsub#owner"><subscriptions xmlns="http://jabber.org/protocol/pubsub#owner"><subscription></subscription></subscriptions></pubsub></iq>

there definetely are subscribers to testNode99.

Am i doing somtehing wrong?

Simon

12

Try this to retrieve all subscriptions

13

Actualy, i posted wrong request. I’m sending the one you suggest.

Simon

14

Look here:

http://community.igniterealtime.org/thread/44499

It might help