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Change-Id: Ifb661509145c16937c9f1c28803687b7cec4b3a4 Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/261815 Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com> Reviewed-by: Rob Orton <rob@instructure.com> QA-Review: Rob Orton <rob@instructure.com> Product-Review: Rob Orton <rob@instructure.com> |
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README.md
Canvas Engines
Welcome to the modular monolith.
Recommended Reading
https://kellysutton.com/2020/03/12/how-to-break-apart-a-rails-monolith.html https://medium.com/@dan_manges/the-modular-monolith-rails-architecture-fb1023826fc4
These are not gospel. They are reasonable-sounding ideas we're trying out. The theory is that they have a lower lift then fully extracting a service, but are a good step down that road because of the way pulling out packages forces you to reckon with your dependency graph.
As a side benefit, this can be done pretty incrementally, moving over a class or a module at a time.
What's in here?
Sets of functionality that are part of canvas, but that we want to be able to work on without breaking other things.
In theory, each vertical component of canvas could be pulled out into an engine so that it gets it's own test suite, and so that it's interactions with other engines can be restricted in some way, forcing shared behavior into more modular packages.
It also over time may make dependencies between areas within the canvas code base explicit and acyclic. Time will tell whether we reap these benefits...
Why isn't this stuff in gems/plugins?
Although the separation may not be perfect yet, thematically the idea would be that things living in "gems/plugins" may actually override behavior inside canvas, of rails or of other classes within the domain like reports or database access.
The engines living in this portion of the repo are intended to be chunks of functionality that we're trying to dis-entangle from the app, and so should not have things like a "spec_canvas" directory for tests that have to be run within the canvas context.