Eberhard Karls Universität Tübingen

Mathematisch-Naturwissenschaftliche FakultätProgramming Languages and Software Technology

Presentation at Scala Symposium

Paolo Giarrusso
Paolo Giarrusso
delivers a talk entitled Revisiting the Cake Pattern: Scaling “Scalable Component Abstractions” at the Scala Symposium 2016 in Amsterdam, The Netherlands. The talk is based on joint work with Jonathan Brachthäuser
Jonathan Brachthäuser


The cake pattern was designed to support modular development combining mixins with ML modules, but it is criticized because mixins are not sufficiently isolated from each other’s implementation. Indeed, as discussed by Gabriel, historically mixins were not designed to enforce isolation, but to support separating intrinsically orthogonal concepts in cooperative development scenarios.

We start investigating the issue and clarify which scenarios the cake pattern does succesfully apply to. We compare the cake pattern with an encoding of (recursive) hierarchical modules based on object composition instead of inheritance, that support fully separate modular development at the cost of more boilerplate.

We also suggest one could support separate modular development without additional boilerplate by combining the cake pattern with private implementation inheritance.

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