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From nmittal <nmit...@rblt.com>
Subject Re: CMS and Multithreading
Date Fri, 01 May 2009 15:42:27 GMT

Thats awesome. saves a lot of time for me as a developer trying to do my own
synchronization.

thanks Tim.


Timothy Bish wrote:
> 
> On Fri, 2009-05-01 at 06:44 -0700, nmittal wrote:
>> below is an excerpt from the book "ActiveMQ in action"...
>> The JMS spec specifically defines concurrency for various objects in the
>> JMS
>> API and requires that only a few objects support concurrent access. The
>> ConnectionFactory, Connection and Destination objects are required to
>> support concurrent access while the Session, the MessageProducer and the
>> MessageConsumer objects do not support concurrent access. The point is
>> that
>> the Session, the MessageProducer and the MessageConsumer objects should
>> not
>> be shared across threads in a Java application.
>> 
>> However, the the examples that come with ActiveMQ CPP... the onMessage
>> function uses the session, consumer objects. I think the onMessage would
>> be
>> called in seperate threads for each message in the queue. So given that
>> session and consumer classes are not threadsafe...is it correct to do so?
>> 
>> thanks
>> Nishant
>> 
> 
> While the spec defines that certain types be thread safe we've shrived
> to ensure that all operations on the CMS objects are thread safe.  That
> being said I would advise showing constraint on overusing CMS objects in
> a method like onMessage as the time spent in that method delays delivery
> of messages, so you wouldn't want to start producing messages from
> onMessage for instance.  
> 
> Regards
> Tim.
> 
> -- 
> Tim Bish
> http://fusesource.com
> http://timbish.blogspot.com/
> 
> 
> 
> 
> 

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