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Sounds like you just recreated Microsoft Biztalk.

But to sound less like a dick - communicating with a low probability of errors is hard !

Having implemented, deployed, and supported "workflows" using BizTalk, ICAN/JCAPS, Orion, homegrown JMS-based stacks, Cache & Ensemble, etc...

Someone1234's solution is the antithesis of BizTalk, the complete refutation of the ultimate futility of using workflow engines.

As someone who's actually used Biztalk quite extensively: You wish Biztalk was that straightforward.