Using Dirty Flags in CMP ?

Hi
How to use Dirty Flags in CMP so that stopping ejbStore() to improve performance.If i run a query in SQl it is taking 2milliseconds and where as in CMP it is taking 180milli seconds so i want to reduce the ejbStore() operation when data is not updated.Give some advices to tune the CMP bean.
Looking forward for u r suggestions
Regards
Mohan

Maybe this page helps
http://www.weblogic.com/docs/examples/ejb/extensions/isModified/

Similar Messages

Can I use UserTransaction within a CMP Session bean?

Basically the problem is as follow:
I have the following method in a Statefull session bean:
public Whatever do()
processSomething();
notify();
the notify() basically notifying the client that then query for the something that was processed in the processSomething() method.
THE PROBLEM is that the changes have not been committed yet as the do() method is not finished yet and the container has not committed the changes.
THE QUESTION is - can I use UserTransaction inside
processSomething to commit the changes and leave the bean as CMP? I want to leave it as CMP as there are more methods on the bean and I don't want to have to manage the transactions for them.
Anyone has any other ideas?
Thanks in advanced.

Hi again,
The EJB specs say that a stateful Session Bean with CMT is NOT allowed to use the UserTransaction; see page 361 of the EJB2.0 specification. So combining them will not (or should not) work.
I suggest CMT+SessionSynchronization combined with using a flag to indicate whether notify should be called or not. Otherwise, you could try splitting up the bean into two beans: one with CMT and another one without. The one without CMT could use the UserTransaction and notify.
Also, you might want to check http://www.onjava.com/pub/a/onjava/2001/10/02/ejb.html
Hope that helps a bit,
Guy
http://www.atomikos.com

Implementing Dirty Flag for a generated Model (Flex 4)

Hi there,
I try to implement a dirty flag for a model generated by a Data Binding Wizard. I tried several ways but always failed to get it work properly bounded to the 'enabled' property of a button. Is there a "best approach" to implement this in a by Flex 4 generated model?
I have all the Form elements bound to the model's properties and defined fx:Bindings on the model's property as well to get the changes back to the model as well.
-> I tried to listen to the properyChange event on the Super model but I always returned true for the Dirty flag and couldn't set it to false when I loaded the model into a Form.
-> I tried to implement a similar approach like below, instead of doing a normal 'getter' function on the isDirty flag I bounded it to the propertyChange event, it failed exactly the same way as above
I did used my own solution earlier like this:
[RemoteClass(alias="VODictionaryEntry")]
     [Bindable]
     public class VODictionaryEntry
               private var _id:Number = 0;
               private var _terminology:String;
               private var _description:String;
               private var _notes:String;
               private var _insert_date:String;
               private var _update_date:String;
               private var _vendor_related:Boolean;
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               public function get vendor_related():Boolean
                    return _vendor_related;
               public function set vendor_related(value:Boolean):void
                    _vendor_related = value;
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               public function get update_date():String
                    return _update_date;
               public function set update_date(value:String):void
                    _update_date = value;
                    isDirty = true;
               public function get insert_date():String
                    return _insert_date;
               public function set insert_date(value:String):void
                    _insert_date = value;
                    isDirty = true;
               public function get notes():String
                    return _notes;
               public function set notes(value:String):void
                    _notes = value;
                    isDirty = true;
               public function get description():String
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               public function set description(value:String):void
                    _description = value;
                    isDirty = true;
               public function get terminology():String
                    return _terminology;
               public function set terminology(value:String):void
                    _terminology = value;
                    isDirty = true;
               public function get id():Number
                    return _id;
               public function set id(value:Number):void
                    _id = value;
                    isDirty = true;
this is a very simple solution but it worked like a charm. Can somebody suggest me something else, a better solution?
thank you
r. Sandor
P.S.: I didn't include the validators to simplify the example.

hi,
meanwhile I come a little bit further if you implement the isDirty flag into your remote model and let generate ( to be included in the flex model as well) a model with Flex you can listen to the propertyChange event and do implement a correctly functioning bindable property.
public function VOMessageEntry():void
     addEventListener( PropertyChangeEvent.PROPERTY_CHANGE, handlePropertyChange );
private function handlePropertyChange( event:PropertyChangeEvent ):void
     if ( event.property != "isDirty" )
          isDirty = true;
this code must be inserted into the generated Object itself not in the _Super_objectname source code.
I hope I could helped somebody with this solution.
r. Sandor

Dirty flag set for readonly file page

We are using BDB 4.8.26 transactional data store on Windows 2008 R2.
DB is logging the message "dirty flag set for readonly file page" to the error log ... this entry was logged 17 times in a 24 hr period. The system processes about 3-5 requests a second.
We also are having an incorrect "SECONDARY inconsistent with primary" error reported - this used to be very rare but has increased with increased concurrency. But the dirty flag error is recent - after we dropped a secondary and added a new one - there was no error during the secondary drop and rebuild process.
Appreciate any help on this.
Thanks
Kimman Balakrishnan

Hi Kimman,
I assume you are not opening your databases with the DB_RDONLY flag. This could be cause by not running recovery after a system or application failure. Make sure you run recovery correctly, single threaded, after each system or application failure; review the Architecting Transactional Data Store applications documentation section.
Regards,
Andrei

Dirty flag in standard FPM

I notice that I can change the text of some field in PPM then click Close (without hitting <ENTER>).
I get the data changed dialog box.
How does the dirty flag get set without an event triggering to set it?

Hello Robert,
if you have a look at http://help.sap.com/saphelp_nw04s/helpdata/en/45/b76f4169e25858e10000000a1550b0/content.htm you can see, that there are 3 work-protect modes:
·        NONE
This value means that the work protect mode is not used by the Web Dynpro application. If you navigate to another application in the portal, unsaved data is lost, even if you set the dirty flag.
·        APPLICATION_ONLY
This value means that the Web Dynpro application itself decides if there is still unsaved data u2013 that is, whether the application is dirty. This is why the u201Cdirtyu201D status is only monitored by the server. With this value you cannot ensure that data that has not yet been transferred to the server will not be lost.
·        BOTH
This value means the client also checks the u201Cdirtyu201D status. This ensures that no user input that has not yet been transferred to the server will be lost. This is done by setting the dirty status of the application in SAP Enterprise Portal as soon as the user has entered data.
FPM is using the BOTH mode, which results in behaviour you observed.
Best regards,
Christian

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Hello, Together,
I have a big problem using XMLType in a CMP EJB. I don't know, if somebody knows about it:
I am trying to write a CMP EJB, which should be deployed under JBoss later. The problem here is, which java data type should I use to map a column of XMLType. I have tried to use it as a java.lang.Object, and also as a java.lang.String, it did not work properly.
Can someone help me? Thanks a lot!

Just pass the in the JSP/Servlet involved ServletContext through as a method or constructor parameter of that Java class.
Semi-pseudo:protected doPost(req, res) {
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Can I use oracle blob by CMP bean in weblogic 6?

I use weblogic 6.1(sp3) and Jbuilder 7.when I try to use oracle blob by CMP bean,the
errors are:
javax.ejb.FinderException: Exception raised in findByPrimaryKey
java.io.StreamCorruptedException: InputStream does not contain a serialized object
What should I do?Is there examples about using oracle blob?
thanks a lot!

Great! So what was the problem?
Regards,
Slava Imeshev
"Roger Lee" <[email protected]> wrote in message
news:[email protected]...
>
Finally got it working with CMP, which is my preferred choice (over BMP).
I read the Excel Spreadsheet into a "byte []" array, and the Entity Beanmapped
"byte []" to the Blob column in the Oracle table.
"Slava Imeshev" <[email protected]> wrote:
Roger,
I'm not quite sure I undestand the problem. Could you:
1. Post deployment descriptors in part related to this
CMP bean?
2. Post the piece of code that is failing?
Please post the information above and we will help
you to hunt the problem down.
No, I don't have any problems accessing blobs
from CMP.
Regards,
Slava Imeshev
"Roger Lee" <[email protected]> wrote in message
news:[email protected]...
Yes. I have added;
<dbms_column-type>OracleBlob</dbms-column-type>
It fails because the locater to the blob, obtained by findBYPrimaryKeyis
null.
i.e. an empty_blob() is not created.
Have you got CMP to access Blobs in WLS 6.1?
"Slava Imeshev" <[email protected]> wrote:
Hi Roger,
Have you tried using OracleBlob as dbms-column-type?
Also, could you post that part of your code that is failing?
Regards,
Slava Imeshev
"Roger Lee" <[email protected]> wrote in message
news:[email protected]...
I can access Clobs using CMP. If you are using the Oracle OCI Driveryou
do not
need to add this line.
However if you are using the Oracle Type 4 Thin drivers you need
to
add;
<dbms_column-type>OracleClob</dbms-column-type>
to the file;
weblogic-cmp-rdbms-jar-xml
This DOES NOT work with Blobs.
I am unable to get WebLogic 6.1 sp4 persist a Blob to an Oracle
8.1.x
table and
retrieve it using either CMP or BMP.
Unless any one show me a complete working CMP and BMP example?
Roger Lee
Deepak Vohra <[email protected]> wrote:
BLOB and CLOB DBMS Column Support for the Oracle DBMS
http://edocs.bea.com/wls/docs61/ejb/cmp.html#1061636
shybird wrote:
I use weblogic 6.1(sp3) and Jbuilder 7.when I try to use oracle
blob
by CMP bean,the
errors are:
javax.ejb.FinderException: Exception raised in findByPrimaryKey
java.io.StreamCorruptedException: InputStream does not contain
a
serialized
object
What should I do?Is there examples about using oracle blob?
thanks a lot!

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boolean formValid = isFormValid();
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What is the use of flag in CallTransaction?

what is the use of flag in CallTransaction?

Sunil,
Generally a flag is used to know whether a particular thing is validated or not.I mean
if a = b
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K.Kiran.

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I've found a workaround:
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I would have preferred a more elegant solution.
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Frederic

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