Composing New Abstractions From Object Fragments

Kuhn, Adrian; Nierstrasz, Oscar Marius (2008). Composing New Abstractions From Object Fragments. In: Rajan, Hridesh (ed.) 2nd Workshop on Virtual Machines and Intermediate Languages for Emerging Modularization Mechanisms (pp. 1-12). New York: Association for Computing Machinery ACM 10.1145/1507504.1507505

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As object-oriented languages are extended with novel modularization mechanisms, better underlying models are required to implement these high-level features. This paper describes CELL, a language model that builds on delegation-based chains of object fragments. Composition of groups of cells is used: 1) to represent objects, 2) to realize various forms of method lookup, and 3) to keep track of method references. A running prototype of CELL is provided and used to realize the basic kernel of a Smalltalk system. The paper shows, using several examples, how higher-level features such as traits can be supported by the lower-level model.

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