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Would it be possible make interactive systems with this architecture? The requester needs to be notified about result availability, so some communication must be targeted to specific component (the requester) going against the foundation idea of this pattern.

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I didn't cover it in the article, but the key to get interactivity would be to switch to a datastore layer that supports subscribable queries.

I'm aware of Esper[1] which tries to do this. And maybe/arguably Firebase (?)

[1]: http://www.espertech.com/esper/

I believe RethinkDB also has this functionality, but I’m not 100% certain. Will check the docs later and update...

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