ReadOnly methods for entity beans

[annapurna]

This is related to my earlier message regarding the ejbStore control... I found that we can make some fields read-only, is there a way we can make some methods read-only in JBoss?

If yes, can someone let me know how it is done.

Thanks,
Anna.

[qjafcunuas]

Hi
You should declare NotSupported transaction in your ejb-jar.xml like this :
<container-transaction>

<ejb-name>yourEJBName</ejb-name>
<method-name>yourMethod</method-name>

<trans-attribute>NotSupported</trans-attribute>
</container-transaction>

Bruno

[annapurna]

Making the transaction not Supported ... doesnt this call the ejbStore but just do it outside a transaction?

Actually I was trying out with Required as the transaction attribute assuming I start my transaction in the session bean and continue it in my calls to the entity bean so that any number of gets I make do not raise ejbStore method.But this didnt happen.

Can anyone explain why?

[qjafcunuas]

Making the transaction not Supported ... does that you are in a read-only transaction.

I don't know if it's possible that ejbStore isn't call.

Nevertheless, you can define a boolean member variable to say if your data have been changed. So, in your ejbStore, you can evaluate your boolean to know if you have data to save.

[hezekiel]

NotSupported has nothing to do with ejbStore being called or not. It's a transaction attribute.

Just out of the curiosity I tried that out and it didn't do the trick. Even though my bulk accessor method (getData()) was marked with NotSupported transaction attribute - the call to that method caused ejbStore to be fired.

I think that the original question was that does JBoss support read-only methods (especially with BMP) like Web Logic and Resin do.

The answer is no. But I sure hope that it would be supported in the future! No more 'isModified'-hacks...

[hezekiel]

Oops...
Just found out (from the Jboss book 30_x.pdf)
Go buy it! - it's well worht the cost! =)

<enterprise-beans>

<ejb-name>nextgen.EnterpriseEntity</ejb-name>
<jndi-name>nextgen.EnterpriseEntity</jndi-name>
<method-attributes>

<method-name>get*</method-name>
<read-only>true</read-only>


<method-name>anotherReadOnlyMethod</method-name>
<read-only>true</read-only>

</method-attributes>

</enterprise-beans>