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https://issues.apache.org/jira/browse/UIMA-1288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12698398#action_12698398
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Jerry Cwiklik commented on UIMA-1288:
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As part of this, modify dd2spring and Uima AS java code to support default
broker URLs. A user may omit specifying a brokerURLs in the Deployment
Descriptor. In such case, dd2spring will add a brokerURL property with a value
of "${defaultBrokerURL}" to the top level service as well as all remote
delegates of this service for which a user did not provide specify brokerURL
property. The value for defaultBrokerURL will be taken from the system property
and it will be set by both UIMA_Service and RunRemoteAsyncAE. A user may
specify the value for defaultBrokerURL by adding a new command line argument
for UIMA_Service and RunRemoteAsyncAE. This would be an optional argument. If
the argument is not provided, the code will set defaultBrokerURL to
"tcp://localhost:61616".
> 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
> Assignee: Marshall Schor
>
> 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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