Re: Synchronization between two clustered SM instances

[tpounds <tr...@gmail.com>]

You could try to use JMS topics to send the message to all interested
parties.  The basic setup being each servicemix in the cluster has a special
JMS bc that listens on a named topic and passes those messages to other
service units inside your assembly.  I hope this helps :)

-Trevor


prossma wrote:
> 
> Hi,
> 
> In a project, we're extending the SecuredBroker's authorization
> mechanism by including XACML functionality. We're operating on SM 3.1.1.
> 
> Basically, this is rather straightforward to implement. The broker
> maintains all XACML policies (in memory). Whenever a MessageExchange
> passes along, we extract certain attributes and run authorization on it.
> 
> However, there'll be a (JSR181) service who allows changing the set of
> available policies. Now we'd need a mechanism that informs the broker
> that a change has occurred, such that it updates its policies.
> 
> When we only have a single instance of the SM container running, from
> the service, we can get access to the container via the component
> context, obtain its broker, and give it an update (see JIRA issue
> SM-858).
> 
> However, our project will deploy SM in a clustered environment - and the
> outlined approach will only allow us to update the broker of the
> container in one of the clustered instances.
> 
> I understand that sending an "update" message won't work, as it will be
> consumed by the "fastest" container and won't reach all clustered
> brokers.
> 
> Now my question is:
> What would be the best way to achieve synchronization between the
> brokers of different clustered containers?
> E.g., is there a way to make sure that a message is being sent to all
> clustered containers?
> 
> We'd like to avoid mechanisms based on writing information to permanent
> memory, as this would seriously affect performance. We were thinking
> about something related to stateful session beans (we're deploying into
> JBoss), but then our solution would be bound to the availability of an
> EJB container.
> 
> Any ideas?
> 
> Thanks in advance,
> Ciao,
> Philipp
> 
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