a4j push fails(sometimes) to rerender target component
------------------------------------------------------
Key: RF-5955
URL: https://jira.jboss.org/jira/browse/RF-5955
Project: RichFaces
Issue Type: Bug
Affects Versions: 3.3.0
Environment: JBoss AS: 4.2.2 GA
JBoss Seam: 2.1.1GA
JBoss RichFaces: 3.3.0 GA
OS: Windows XP
Browser: Firefox 3.0.5 and IE 7
Reporter: Atul Kshirsagar
a4j push tag fails to reRender the target component (specified in reRender
attribute) sometimes.
In our project we are using a4j:push tag to dynamically refresh certain
portions of our web page depending upon events generated on server side. The
problem that I am seeing is that some times (not always) a4j push does not
reRender the target id specified even though PushEventListener is notified of
an Event.
Note that I have 8 a4j push tags refreshing different components on our web
page and we can see burst of events (approx 200 events in less than 1 min).
Below given is the example code:
xhtml that uses a4j:push tag:
<a4j:push reRender="myTableId" eventProducer="#{myBean.addListener}"
interval="10000"
ignoreDupResponses="true"
action="#{mybean.populateViewModel}"/>
<rich:dataTable id="myTableId" value="#{myBean.data}" var="_data">
<rich:column>
<h:outputText value="#{_data.name}" />
</rich:column>
</rich:dataTable>
Backing bean definition is as follows:
@Stateful
@Local( {
MyBeanLocal.class
})
@Name("myBean")
@Scope(ScopeType.SESSION)
@Restrict("#{identity.loggedIn}")
public class MyBean implements MyBeanLocal, Serializable {
@EJB
private MyEJB ejb;
private MyBeanListener eventListener;
/**
* DataModel
*/
private List<Data> data;
public List<Data> getData() {
return this.data;
}
@Create
public void create() {
this.data = new ArrayList<Data>();
populateViewModel();
}
// destroy method de-registers the listener from DataModel
@Remove
@Destroy
public void destroy() {
DataModel dataModel = ejb.getDataModel();
if (dataModel != null) {
dataModel.removeChangeListener(eventListener);
}
}
/**
* Adds listener for conveying AJAX events.
*
* @param listener
*/
public void addListener(EventListener listener) {
DataModel dataModel = ejb.getDataModel();
eventListener = new MyBeanListener();
eventListener.addListener(listener);
dataModel.addChangeListener(eventListener);
}
/**
* Constructs the view data model required for the link utilization widget on
dashboard
*/
public void populateViewModel() {
data.clear();
DataModel dataModel = ejb.getDataModel();
data = dataModel.getData();
}
}
public class MyBeanListener implements Serializable {
private PushEventListener listener;
public void addListener(EventListener l) {
this.listener = (PushEventListener)l;
}
public void dataChanged() {
listener.onEvent(new EventObject(this));
}
}
public class DataModel implements MessageListener {
private List<MyBeanListener> listeners;
public void addChangeListener(MyBeanListener l) {
listeners.add(l);
}
public void removeChangeListener(MyBeanListener l) {
listeners.remove(l);
}
public void fireEvent() {
for (MyBeanListener l: listeners) {
l.dataChanged();
}
}
// This method is called on JMS message
public void onMessage(Message message) {
// update internal data structure and then notify listeners
fireEvent();
}
}
So what is happening here is that class MyBean is SFSB and registers
MyBeanListener with DataModel when addListener is called (by virtue of
eventProducer attribute of a4j:push). DataModel is a JMS listener and upon
receiving JMS message it notifies the registered listener of change in data.
What I am seeing here is that all the above described flow happens and a4j:push
gets notified of the event (I verified this by checking that populateViewData
method of MyBean gets called) but the reRender of 'myTableId' component does
not happen (this happens only intermittently...e.g If I repeat the test for
about 4 to 5 times I will see it happening once). I debugged it using a4j:log
component and found that sometimes the ajax response does not contain the
component with id 'myTableId'.
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