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From kitplummer <kitplum...@gmail.com>
Subject Re: Special Topic/Queue...
Date Thu, 04 May 2006 20:37:10 GMT

Ok, I'm a little confused on how to specify the the lastImage policy.  Is it
possible to do this programmatically?


kitplummer wrote:
> 
> What I am trying to do is create a notification mechanism for interested
> servers.  For example, there is a system flag (which defines a system
> behavior) which would be published.  Any consumer interested in that
> system flag would get latest system state by consuming a published
> message.
> 
> New subscribers would not need to access any previous messages, only the
> most recent.
> 
> I'm going to look into the Subscription Recovery stuff a bit.  Looks like
> the Retroactive Consumer might do the trick.  Thanks.
> 
> Kit
> 
> 
> James.Strachan wrote:
>> 
>> Could you describe your requirements a little more just to check I
>> understand. You basically want a topic which always sends 1 message to
>> every
>> consumer when they start subscribing and this message changes over time
>> right? When the message changes is it sent to all consumers active, or is
>> it
>> just sent to new subscribers?
>> 
>> You could go with durable subscribers; but then that means all messages
>> sent
>> to a topic are persisted until your consumer restarts. It seems like you
>> just want 'the last one' available to new consumers?
>> 
>> So maybe using a Subscription Recovery Policy might be cleaner...
>> http://activemq.org/Subscription+Recovery+Policy
>> 
>> so that you can decide what message is sent to new consumers using a
>> cached
>> 'last image' that is sent when new consumers start; then you just send a
>> message to everyone when this 'last image' changes?
>> 
>> 
>> On 5/4/06, kitplummer <kitplummer@gmail.com> wrote:
>>>
>>>
>>> I suppose all I need to do is setup the consumers as durable
>>> subscribers.
>>> The producer side doesn't matter does it?
>>> --
>>> View this message in context:
>>> http://www.nabble.com/Special-Topic-Queue...-t1558344.html#a4233834
>>> Sent from the ActiveMQ - User forum at Nabble.com.
>>>
>>>
>> 
>> 
>> --
>> 
>> James
>> -------
>> http://radio.weblogs.com/0112098/
>> 
>> 
> 
--
View this message in context: http://www.nabble.com/Special-Topic-Queue...-t1558344.html#a4236924
Sent from the ActiveMQ - User forum at Nabble.com.


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