Make optional references sane
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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
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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