Integration

hi all,

Apologies if this is a stupid question, but i throw my hands up and admit my ignorance (I'm mainly a core Java developer; OSB/ALSB is kind of a sideline for me). That said...

I've used OSB (actually ALSB) on a couple SOA projects within the last 3 years. on my previous projects, we mainly only ever used Routing actions. I'm now working on a 3rd project that also uses OSB. But on this new project, they mainly only ever use Service Callout actions and Publish actions.

My question is: what are the criteria for choosing between one or the other (Routing action or Service Callout action or Publish action)?

What does one do that the others can't? I've RTFM. But it still isn't obvious to me. Please, can you fill in the gaps in my knowledge?

Thanks in advance for your time.