So, MQ was an active area for a while with several contenders like AP4R.
Many libs seemed focused on triggering long or scheduled processes, and
not really for connecting many small apps together to build responses
for a Rails front-end app.
After some googling, it seems like activity has dies off. AP4R seems to
have stalled (I can't find anything newer than a year old). None of the
projects that surfaced from 05 through 08 seems to have become the de
facto "winner" that I can see.
I'm looking for a MQ system that's not about just offloading long or
scheduled activities, but for real-time messaging to connect several
small independent Rails/Ruby apps to build a Rails page.
I'm hoping to find something that can handle a number of different data
formats for replies (XML, YAML, native AR objects or maybe even
marshalled ruby objects).
Any suggestions on the best contenders?