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https://issues.apache.org/jira/browse/ARIES-577?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alasdair Nottingham resolved ARIES-577.
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Resolution: Fixed
Fix Version/s: 0.4
> Make optional references sane
> -----------------------------
>
> Key: ARIES-577
> URL: https://issues.apache.org/jira/browse/ARIES-577
> Project: Aries
> Issue Type: Improvement
> Components: Blueprint
> Reporter: Alasdair Nottingham
> Assignee: Alasdair Nottingham
> Fix For: 0.4
>
>
> One of the problems with optional references is that you have to wrap any
> call to them in a try catch for ServiceUnavailableException which could be
> thrown. There is no realistic way to "know" that the proxy is wired. Any
> option you might choose provides a window where you could still get
> ServiceUnavailableException.
> Instead I propose adding the following optional attribute in the blueprint
> extension schema:
> default="bean id"
> when the no backing service is provided if this is set the request will be
> silently routed to the identified default bean. When the service arrives it
> will switch and route to the target service. When the service goes it will
> route back to the default bean assuming no alternative is available.
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