[richfaces-issues] [JBoss JIRA] (RF-12072) Lost event in push
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https://issues.jboss.org/browse/RF-12072?page=com.atlassian.jira.plugin.s...
]
Lukáš Fryč commented on RF-12072:
---------------------------------
The proposed solution of queuing requests solves the issue only partially - it
significantly decreases probability of losing event, but it still doesn't eliminate it
completely.
To ensure completeness, you would need to block until a client is subscribed to a topic
before you could continue with rendering of the page.
----
Another suggestion is to create new event {{subscribed}}, allowing you to react on
successful subscription with specific action - in this case partial page reload.
----
Still we need to make sure this behavior is documented properly.
Lost event in push
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Key: RF-12072
URL: https://issues.jboss.org/browse/RF-12072
Project: RichFaces
Issue Type: Bug
Security Level: Public(Everyone can see)
Components: component-push/poll
Reporter: Stian Thorgersen
Assignee: Lukáš Fryč
Fix For: 4.2.1.CR1
Event can be lost if produced while a response is being prepared. I've attached an
example where a push event is used to refresh a count whenever an event is fired. It's
using Thread.sleep to simulate an event being produced while the response is being
prepared. Note, if the sleep just before returning the count is removed it all works fine,
and the page is refreshed every 5 seconds, but with the sleep in place the event is lost.
View:
{code}
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-GB"
lang="en-GB"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:a4j="http://richfaces.org/a4j"
xmlns:rich="http://richfaces.org/rich">
<h:head>
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8" />
</h:head>
<h:body>
<h:form id="myForm">
<a4j:push address="chat">
<a4j:ajax event="dataavailable" render="count" />
</a4j:push>
<h:outputText value="#{myBean.count}" id="count" />
</h:form>
</h:body>
</html>
{code}
Bean:
{code}
package com.example;
import java.io.Serializable;
import java.util.concurrent.atomic.AtomicInteger;
import javax.enterprise.context.SessionScoped;
import javax.inject.Named;
import org.richfaces.application.push.TopicKey;
import org.richfaces.application.push.TopicsContext;
@Named
@SessionScoped
public class MyBean implements Serializable
{
private AtomicInteger count = new AtomicInteger();
public int getCount()
{
int c = count.get();
new Thread()
{
public void run()
{
try
{
Thread.sleep(5000);
count.incrementAndGet();
TopicKey topicKey = new TopicKey("chat");
TopicsContext topicsContext = TopicsContext.lookup();
topicsContext.publish(topicKey, "");
}
catch (Exception e)
{
e.printStackTrace();
}
};
}.start();
try
{
Thread.sleep(10000);
}
catch (InterruptedException e)
{
}
return c;
}
}
{code}
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