Selective Multicast

[narita bagchi]

Is there a way I can selectively multicast? 

But I do not want to do a multicast-filter like -
multicast().filter(header("foo").isEqualTo("bar")).to(
"file:outbox1", "file:outbox2", "file:outbox3");

In my case, the destinations (say outbox1, outbox2 and outbox3) are obtained 
dynamically.

~Narita