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Maybe expose some interface having commit / rollback methods to make it easier for component developers to implement custom logic. Currently they may not know about OnCompletion and how to use UnitOfWork on Exchange to do this today.

Unify uri/ref (cmueller)

+1: claus, cmueller

Instead of having both uri and ref for endpoints, we should unify this and only use uri. If people want to use ref, then they can do that using "ref:xx" as an uri. This would simplify code as we dont have to check for either one.

Refactor UnitOfWork

The implementation of DefaultUnitOfWork seems to have transformed itself into a to broad concern where unit of work is doing a bit more work than the transactional aspect that ties to its name.
Maybe this implementation should be named ExchangeContext and we can introduce a simpler UnitOfWork concept. This would also allow us to refactor the SubUnitOfWork into a general parent/child unit of work concept.
However this requires API changes and thus is best kept for Camel 3.0

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