UnitOfWork.refreshObject(); don't fire event for Cache Synchronization

My WebApp use JMS for cache synchronization.
and I need to refresh session Cache by using method unitOfWork.refreshObject() but it don't publish any message to JMSserver.
sinse My JMS cache synchronization work well when I do UnitOfWok transaction(insert,update,delete)
How to force cache synchronization ?
thank you,
Kowit Laison

TopLink cache synchronization only synchronizes changes made through a unit of work, it does not synchronize reads or refreshes.
You will need to perform the refresh on each server, or make your own JMS message to notify your other server's to refresh.
You may also wish to investigate the TopLink 10.1.3 Preview release that adds support for Cache Invalidation and Cache Invalidation Synchronization. You may be able to broadcast an invalidation command for the refresh.

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Event for cache invalidation

Hi,
I'm new to TopLink (10.1.3) and I'm a bit puzzled as to how I'll solve my problem. We are currently loadind resources from the database into memory, about the same way as a ResourceBundle. However, I've set a DailyInvalidationPolicy for the cache and I'm trying to find a way to track an event upon expiry. Is there an Event I can use for a Listener implementation that would reload all my objects into memory from the BD? I've seen events like postRefresh and other events in DescriptorEventAdapter and SessionEventAdapter, but nothing seems to be appropriate. Thanks a lot in advance for any reply...

Hello,
The DailyInvalidationPolicy mechanism does not actively invalidate objects. Instead when an object is requested TopLink checks the read date and determines if the object is invalid and requires refreshing. As such the only event available to mark this operation would be a postRefresh event.
--Gordon

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Can somebody explain to me how the error handling works for the distributed cache synchronization ?
Say I have four nodes of a weblogic cluster and 4 different sessions on each one of those nodes.
On Node A an update happens on object B. This update is going to be propogated to all the other nodes B, C, D. But for some reason the connection between node A and node B is lost.
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This "should-remove-connection-on-error" option mainly applies to RMI or RMI_IIOP cache synchronization. If you use JMS for cache synchronization, then connectivity and error handling is provided by the JMS service.
For RMI, when this is set to true (which is the default) if a communication exception occurs in sending the cache synchronization to a server, that server will be removed and no longer synchronized with. The assumption is that the server has gone down, and when it comes back up it will rejoin the cluster and reconnect to this server and resume synchronization. Since it will have an empty cache when it starts back up, it will not have missed anything.
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JMS & Cache synchronization

We have setup Toplink to do cache synchronization using Tibco JMS. We are using Tomcat Servlet environment. We are using the pre-login event in Toplink to specify the necessary information required for cache synchronization using JMS. For some reason Toplink connects to JMS using the name "anonymous" in addition to connecting with the user name we specify in the code. Toplink also seems to connect to some queue in addition to the Topic that is mentioned in the code. Does anyone know why Toplink would behave like this?

Hello,
TopLink uses JNDI to get the TopicConnectionFactory, and will login using the username/password you have specified. It then calls createTopicConnection() that will use the default userid to get a connection to a Topic, so this could be what you are referring to. The login specified in the cache synch setup is only to access JNDI.
That said, TopLink does not use a queue that I have ever seen. The source code for the JMSClusteringService is shipped with TopLink and can be used to fill in parts left out of the documentation, as well as allow for customizations. In this case, it would be good to review it to get an understanding of the calls TopLink does to connect. If this does not help, I'd need to see the configuration used to set up cache synchronization.
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We are in process to integrate CRM On Demand and existing Microsoft SQL DB.
We have the following problem:
For ex., we have CRM Object_1 that already synchronized with the SQL DB. CRM also has independent Object_2 and its child Object_2.1
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Edited by: 955827 on Aug 29, 2012 11:57 AM

Hi,
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Want to fire event receiver before workflow is execute while adding File in Document Library.

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I have Event receiver and workflow attached to same Document
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Best Practice for caching global list of objects

Here's my situation, (I'm guessing this is mostly a question about cache synchronization):
I have a database with several tables that contain between 10-50 rows of information. The values in these tables CAN be added/edited/deleted, but this happens VERY RARELY. I have to retrieve a list of these objects VERY FREQUENTLY (sometimes all, sometimes with a simple filter) throughout the application.
What I would like to do is to load these up at startup time and then only query the cache from then on out, managing the cache manually when necessary.
My questions are:
What's the best way to guarantee that I can load a list of objects into the cache and always have them there?
In the above scenario, would I only need to synchronize the cache on add and delete? Would edits be handled automatically?
Is it better to ditch this approach and to just cache them myself (this doesn't sound great for deploying in a cluster)?
Ideas?

The cache synch feature as it exists today is kind of an "all or nothing" thing. You either synch everything in your app, or nothing in your app. There isn't really any mechanism within TopLink cache synch you can exploit for more app specific cache synch.
Keeping in mind that I haven't spent much time looking at your app and use cases, I still think that the helper class is the way to go, because it sounds like your need for refreshing is rather infrequent and very specific. I would just make use of JMS and have your app send updates.
I.e., in some node in the cluster:
Vector changed = new Vector();
UnitOfWork uow= session.acquireUnitOfWork();
MyObject mo = uow.registerObject(someObject);
// user updates mo in a GUI
changed.addElement(mo);
uow.commit();
MoHelper.broadcastChange(changed);
Then in MoHelper:
public void broadcast(Vector changed) {
Hashtable classnameAndIds = new Hashtable();
iterate over changed
if (i.getClassname() exists in classAndIDs)
classAndIds.get(i.getClassname()).add(i.getId());
else {
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vc.add(i.getId())
classAndIds.add(i.getClassname(),vc);
jmsTopic.send(classAndIds);
Then in each node in the cluster you have a listener to the topic/queue:
public void processJMSMessage(Hashtable classnameAndIds) {
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raq.refreshIdentityMapResult();
ExpressionBuilder b = new ExpressionBuilder();
Expression exp = b.get("id").in(idsVector);
roq.setSelectionCriteria(exp);
session.executeQuery(roq);
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Flex 4 does not dispatch keyboard events for ENTER key.

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Here is the sample application that has got this issue:
<s:Application
   xmlns:fx="http://ns.adobe.com/mxml/2009"
   xmlns:s="library://ns.adobe.com/flex/spark"
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   keyUp="application1_keyUpHandler (event)">
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         import mx.controls.Alert;
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   <s:layout>
      <s:BasicLayout/>
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</s:Application>
If you run this application and try typing anything in a TextArea you will get alerts with key codes. However, if you press ENTER (or ALT), you will get no alert.
I'm pretty sure the code above is right so that means there is a bug in latest nightly builds of SDK (i would swhitch to an older build if i knew which one does not have this bug).
Any ideas?

Flex harUI wrote:
That's true, but in this case, I think the text editing code is eating ENTER key in order to prevent parents from seeing it and acting on it (like a submit button). We'll see if we can find a way around that.
You can get the ENTER key now by listening in capture phase.
Alex Harui
Flex SDK Developer
Adobe Systems Inc.
Blog: http://blogs.adobe.com/aharui
The enter key isn't being disposed of by textedit, the attached example code works without error if you a- remove the alert box and b-set the focus to your text area on initialisation. I agree that pressing the enter key then calling a dialog box will result in the enter key being "gobbled up" as the enter key is overridden by the dialog box code.
I think the first suggestion should be to anyone don't use dialogboxes for testing code. If for some reason debugging isn't desirable instead of a trace statement a simple label can be used as a 'fake' trace.
David
Message was edited by: David_F57: I worded this wrong, imho there is no need for a work around, the textarea component works as it should. When intercepting 'system' keycodes there is a need to consider the effect of the intercept and code appropriately to that end.

UnitOfWork.refreshObject(); don't fire event for Cache Synchronization

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