从XMPP检索最后一项使用Smack的PubSub节点始终只返回一个项目

Question

I'm using the latest Smack (4.1) for my Android application.

When retrieving persistent items from a node, does it only return the latest published items for each user? Right now, when I try to call getItems, I seem to only get the latest published event from each user. I would like to retrieve all of the items from the node, even if there's more than one item for each user.

This is the code I'm using currently for retrieval:

PubSubManager manager = new PubSubManager(connectionManager.getConnection());  
node = manager.getNode(nodeList);  
Collection<PayloadItem<EventItem>> eventItems = node.getItems(25);  
Log.e(TAG, "Collection size: " + eventItems.size());  
List<PayloadItem<EventItem>> payloadList = new ArrayList<>();  

for(PayloadItem<EventItem> payload : eventItems) {  
     eventItemList.add(payload.getPayload());  
}

This is my node configure form:

ConfigureForm configureForm = new ConfigureForm(DataForm.Type.submit);  
        configureForm.setAccessModel(AccessModel.open);  
        configureForm.setDeliverPayloads(true);  
        configureForm.setNotifyRetract(true);  
        configureForm.setPersistentItems(true);  
        configureForm.setPublishModel(PublishModel.open);  

As you can tell, setPersistentItems is true. If one user submits two items to a node and then calls getItems, only the latest of their published items is received. The debug shows that I only receive the following:

<?xml version="1.0" encoding="UTF-8"?>  
<iq to="pubsub.example.com" id="4cw4Z-27" type="get">  
   <pubsub xmlns="http://jabber.org/protocol/pubsub">  
   <items node="TESTNODE" max_items="25" />  
   </pubsub>  
</iq>  


<?xml version="1.0" encoding="UTF-8"?>  
<iq from="pubsub.example.com" to="afa@example.com/Smack" id="4cw4Z-27" type="result">  
   <pubsub xmlns="http://jabber.org/protocol/pubsub">  
      <items node="TESTNODE">  
         <item id="bool@example.com/Smack">  
            <newevent xmlns="http://jabber.org/protocol/newevent" xml:lang="en">  
               <sender>bool@example.com</sender>  
               <title>Test Title 2</title>  
               <description>Test description</description>  
            </newevent>  
         </item>  
      </items>  
   </pubsub>  
</iq>  

This is the only thing I receive in the debug. No other items present except for the latest published one for that particular user and other users.

It's clear that I am receiving the items stored in the node, however the server only returns the latest published item for each user. I would like to retrieve all items published to the node regardless if it's the latest one for that user or not.

Is this a server setting issue? I appreciate any advice or suggestions. Thanks!

Answer 1

This could possible be a server limitation. XEP-60 6.5.7 makes max_items a optional feature.

Answer 2

I was setting the JID of the payload item to the User's JID. As a result, I was overwriting the previous ID's and the previous submissions from the user was being overwritten. I set the PayLoadItem's ItemID to null and that let the server generate a unique ID each time, so the previous items would not be overwritten.