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From "Jerry Cwiklik (JIRA)" <uima-...@incubator.apache.org>
Subject [jira] Commented: (UIMA-1288) Need a Better Approach For Specifying UIMA AS Broker URL in Deployment Descriptor
Date Fri, 27 Mar 2009 18:08:50 GMT

    [ https://issues.apache.org/jira/browse/UIMA-1288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12689992#action_12689992
] 

Jerry Cwiklik commented on UIMA-1288:
-------------------------------------

Vm protocol is no longer used. It was used for messaging between colocated
services. Since we use java queues for internal messaging, vm is obsolete. We do need to support
http in addition to tcp protocol however. In a near future we need to support lists of URLs
to support
broker failover in deployments that use Network of Brokers.


> Need a Better Approach For Specifying UIMA AS Broker URL in Deployment Descriptor
> ---------------------------------------------------------------------------------
>
>                 Key: UIMA-1288
>                 URL: https://issues.apache.org/jira/browse/UIMA-1288
>             Project: UIMA
>          Issue Type: Improvement
>          Components: Async Scaleout
>            Reporter: Jerry Cwiklik
>
> Each UIMA AS deployment descriptor requires at least one Broker URL for the connection
factory. Instead of hard coding the URL, perhaps a placeholder for it should be used. At runtime,
the placeholder could be resolved to the actual URL by Spring resolver component. The value
could come from either an external file or from an environment. The new approach should accommodate
specifying more than one placeholder, since an aggregate may have delegates whose queues are
managed by a different broker. The new approach would simplify deployment of UIMA AS services,
especially during testing.
> A placeholder syntax could be inherited from Spring, where it looks like ${placeholder-name}.

> dd2spring would need to change to handle a placeholder notation in addition to supporting
hard coded broker URL that we use now. A new bean must be added to the generated xml. It will
be :
> <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
>     <property name="systemPropertiesModeName"  value="SYSTEM_PROPERTIES_MODE_OVERRIDE"/>
>    </bean>
>  
> This bean is setup to resolve placeholders using system variables, like -Dplaceholder-name=placeholder-value

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