On 14 May 2008, at 20:18, code.junkie wrote:
Hi All,
I am planning to use ActiveMQ with a java project that I am working
on. I am
planning to use a queue with persisted for reliable messaging
( guaranteed
messaging ). In that regard I have couple of questions for which I
would
love to get some views on:
Great! persistence is the default delivery mode for Queues - so no
problems there.
1) It is my understanding that I can either use ActiveMQ's APIs
directly or
use via JMS ( using jndi). I am not sure what is the advantage of
using the
JMS approach over using the activemq's apis directly?
Keeping to the JMS interface directly will give you more independence
- though things may be a little easier to get started if you use an
ActiveMQConnectionFactory directly.
However, instead of JNDI you could use Spring - see
http://activemq.apache.org/spring-support.html
2) I am planning to use batching for sending messages (persistent)
to the
queue and was confused by reading
http://activemq.apache.org/how-do-i-enable-asynchronous-sending.html
Should I still be using jms.useAsyncSend=true in case of batching ?
The easiest way to batch messages is to use a transaction - see http://activemq.apache.org/how-do-transactions-work.html
- that will send async anyway though the commit will be synchronous
3) What is a good practice for consumer? Should I be reading the
messages
from the queue within a transaction? ( The reason being that I am
using
Session.SESSION_TRANSACTED for the producer, so what should be the
proper
way in consumer assuming producer and consumer processes at the same
speed)
Why not use transactions for the consumer ? - there maybe a marginal
improvement in performance - as it allows us to batch up the
acknowledgements back to the server.
Note of caution though - ensure the transaction boundary is smaller
than the prefetch size - see http://activemq.apache.org/what-is-the-prefetch-limit-for.html
it makes the broker have to work less!
Thanks in advance!
- Rakesh
3)
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cheers,
Rob
http://open.iona.com/products/enterprise-activemq
http://rajdavies.blogspot.com/
