Recently I gave a presentation at a local technology group about 
reactive-streams. In order to demonstrate back-pressure, I whipped up this 
project which both visualizes the graph of a stream and shows the activity 
as it runs. I built it on Spray (ironically) because I didn't know if a 
web-sockets implementation existed already for akka-http. In the front-end, 
I'm using Dagre (a directed graph renderer) & D3 for visualization, along 
with some coffee script code. I know bonus points would've been awarded for 
scala-js usage.

Anyway, if interested, find the code here:

https://github.com/timcharper/reactive-viz

Instructions are in the README.

The impatient can just watch the following video to get an idea of what it 
does:

http://screencast.com/t/0q0sIGxC4


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