Support for marking a CamelProxy as a primary or non-primary spring bean

It would be very handy if a camelProxy bean (which is also a spring bean) could be defined as primary (see http://static.springsource.org/spring/docs/3.0.x/spring-framework-reference/htmlsingle/spring-framework-reference.html, search for @Primary).

I have a content based route, which delegates to some other beans depending on argument values to the proxy. All three beans implement the same interface. So if I could just mark the proxy as primary that bean would be preferred.

Other usecases where you would like it not to be primary probably exist as well.

I suggest adding an optional boolean attribute "primary" which is by default true.