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Subject: RE: Mixing up AMQP QPID and JMS
Date: Thu, 20 Aug 2009 09:47:30 +0200
Message-ID: 
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In-Reply-To: <129a14790908191113k69905d74had0160d9c3f64337@mail.gmail.com>
Thread-Topic: Mixing up AMQP QPID and JMS
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From: "Leglise Yann" <yleglise@sopragroup.com>
To: <users@qpid.apache.org>

Hello Robert,

I am not particulary trying to create queues dynamically. I am in fact =
trying to determine if by using the JMS QPID implementation leads to an =
AMQP compliant behaviour. I mean, by using JMS, as soon as a use a =
consumer on an non-existing queue, this queue is automatically created =
in the broker. Would this happen if I used "low level" QPID java, or C++ =
or python?
As we discussed before, QPID is an implementation of AMQP, so I expected =
that whichever was the underlying language or library used, the use of =
QPID would lead to the same result, i.e. the behaviour specified in =
AMQP.
As I have read that in AMQP queues should be explicitely declared, I was =
just wondering if the automatic queue creation achieved through JMS was =
acceptable since it was not the behaviour described by AMQP, or in other =
words, I am wondering if the JMS QPID implementation is AMQP compliant.

Regards.


Yann LEGLISE

-----Message d'origine-----
De : Robert Greig [mailto:robert.j.greig@gmail.com]=20
Envoy=E9 : mercredi 19 ao=FBt 2009 20:13
=C0 : users@qpid.apache.org
Objet : Re: Mixing up AMQP QPID and JMS

2009/8/19 Leglise Yann <yleglise@sopragroup.com>:

> 2) If it is, are both implementations equivalent and compliant with =
AMQP the same way? I am asking because using JMS, when you create a =
Consumer on a queue that is not declared as an administered object, this =
queue is created in the broker.

This isn't generally the case, it is dependent on the message broker you =
are using. Nearly all brokers will have permissions to limit which =
clients can create queues.

> I believe this a a normal JMS behaviour, but I have read somewhere =
that in AMQP, queues must be explicitly declared, what I understood by =
"if queues are not explicitly declared, they cannot be used".

This is likely referring to the underlying protocol. Higher level APIs =
such as JMS are designed to shield the developer from the low level =
details.

Are you trying to write an application that requires queues be created =
dynamically at run-time by a client?

Robert

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