On 29 Maj, Vincent Harcq wrote:
> Hi,
> Both of you gives me a clever answer for a stupid question ;)
> What I only wanted to point out, it is that specifying in ejb-jar.xml:
> <acknowledge-mode>AUTO_ACKNOWELDGE</acknowledge-mode>
> is not correct.
> It should be
> <acknowledge-mode>Auto-acknowlede</acknowledge-mode>
>
> - and not _
>
> AUTO_ACKNOWLEDGE is when doing JMS
> Auto-acknowlede is when deploying MDB
>
> I understand (now) that JBossMQ does not care of the value, but the docu
> should give
> the correct definition.
OK, I am with you now. Go ahed and do it. It's in
org.jboss.metadata.MessageDrivenMetaData and in the documentation.
Please , keep AUTO_ACKNOWELDGE as a possible way, just for the sake of
backward compatibility.
//Peter
>
> Regards.
> VIncent.
>
>> -----Message d'origine-----
>> De : [EMAIL PROTECTED]
>> [mailto:[EMAIL PROTECTED]]De la part de
>> Hiram Chirino
>> Envoyé : mardi 29 mai 2001 1:45
>> À : [EMAIL PROTECTED]
>> Objet : Re: [JBoss-dev] MDB Auto-_-_Acknowledge
>>
>>
>> I totally agree with peter. If the container takes the
>> "Dups-ok-acknowledge" setting and implements it just like the
>> "Auto-acknowledge" setting, the container's contract with the client would
>> still be vaild.
>>
>> Regards,
>> Hiram
>>
>> ----- Original Message -----
>> From: "Peter Antman" <[EMAIL PROTECTED]>
>> To: <[EMAIL PROTECTED]>
>> Sent: Monday, May 28, 2001 3:02 AM
>> Subject: Re: [JBoss-dev] MDB Auto-_-_Acknowledge
>>
>>
>> > On 28 Maj, Vincent Harcq wrote:
>> > > Hi,
>> > > After implementing MDB in ejbdoclet, one of the developer find out
>> > > that jboss does not follow the spec for <acknowledge-mode> on MDB.
>> > > Page 462:
>> > > <!--
>> > > The acknowledge-mode element specifies whether JMS AUTO_ACKNOWLEDGE
>> > > or DUPS_OK_ACKNOWLEDGE message acknowledgment semantics should be
>> > > used for the onMessage message of a message-driven bean that uses bean
>> > > managed transaction demarcation.
>> > > The acknowledge-mode element must be one of the two following:
>> > > <acknowledge-mode>Auto-acknowledge</acknowledge-mode>
>> > > <acknowledge-mode>Dups-ok-acknowledge</acknowledgemode>
>> > > Used in: message-driven
>> > > -->
>> > >
>> > > So - for MDB and _ for JMS
>> > >
>> > > Stupidity of the spec maybe, but we need to change jboss to have full
>> > > compliance. I can commit the change and I propose to keep both
>> > > possibilities for safety.
>> > >
>> >
>> > Well, I don't think it is that easy. First we had support for it. Then
>> > Hiram added support for XA transactions in JBossMQ and added support for
>> > that in the MDB container, but broke support for ACK modes. We had some
>> > arguing about this, and finally decided that we did not need to support
>> > DUPS_OK_ACKNOWLEDGE.
>> >
>> > Was this bad or god? Well, I would interpret it this way.
>> >
>> > 1. With bean managed transaction we support AUTO_ACKNOWLEDGE semantics,
>> > i.e every message is automtically acked. Yes, we are doing it with a
>> > transacted session, but that is an implementation question and
>> > nothing else (who cares that non XA transactions in JBossMQ is
>> > actually managed with single commit XA transactions under the hood?
>> >
>> > 2. DUP_OK. To my knowledge this is a flag that the JMS provider MAY
>> > obay (i.e it is completly up to the JMS provider how to implement
>> > support for this - it may even be done as AUTO_ACKNOWLEDGE). What it
>> > says is that if it is used ,the client have to be aware that there
>> > may be some resent messages.
>> >
>> > Therefore I would say that the MDB container is spec compliant. You may
>> > specify AUTO_ACKNOWLEDGE or DUP_OK in the deployment descriptor, but the
>> > implementation does not care (which in my view probably is not a breach
>> > with the spec). If it is possible to show that DUPS_OK if used could
>> > lead to dramatic increase in performance, that would be another
>> > question.
>> >
>> > That to say, if you are able enough to reimplement support for DUPS_PK
>> > without braking anything, please go ahead.
>> >
>> > file://Peter
>> >
>> > > Vincent.
>> > >
>
>
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