Missing part of README: using Graph for building the whole application from "services"

[si14]

There were a lot of mentions in various talks and mail lists that Prismatic uses Graph to structure it's applications and not only "computation flow" in a single part of a program. There is even a short example in tests. However, as far as I know, there is no definitive overview of how to really build an application this way.

There is a non-Prismatic library to do something similar, but how does that library differs from what you do?

Personally, I didn't find the perfect way to structure Clojure apps, everything that I've tried had some serious downsides. It looks like I'm not alone in this. Is it possible to extend this project's README to include more details on the topic?

[w01fe]

Thanks for your interest in this. We know this is missing currently in Graph, and it's been something we have planned to release for a while. But, there are a number of additional pieces that fit together to make our service infrastructure useful, and our plan has been to release these together with an example service and such -- we just have unfortunately not had the resources to do this yet. We hope to release our version soon, but in the mean time system-graph seems like a reasonable alternative.

Concretely, our setup is composed of:

• Graph, plus something like component to allow shutting down of node resources. system-graph seems to capture this aspect well.
• Service configuration files, with a built-in notion of things like service names, runtime configuration modes, and so on.

[niquola]

👍

[kramano]

👍

[tom-pang]

+1

[cprice404]

We had a similar need at Puppet Labs, though we have slightly different requirements due to the fact that we ship on-premise software and a lot of the existing things seem to lend themselves more easily to a SaaS environment. We wrote a framework that uses Graph for managing dependencies, has a protocol for service lifecycles, and allows you to use clojure protocols to specify the interfaces for custom services that you write.

I'm sure the pure prismatic solution will be fantastic (as are the current libraries you guys ship!), but if anyone is interested in the interim, ours is called trapperkeeper.

[tangrammer]

+1