Piccola - a Small Composition Language

Achermann, Franz; Lumpe, Markus; Schneider, Jean-Guy; Nierstrasz, Oscar (2001). Piccola - a Small Composition Language. In: Bowman, Howard; Derrick, John (eds.) Formal Methods for Distributed Processing - A Survey of Object-Oriented Approaches (pp. 403-426). Cambridge University Press

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Although object-oriented languages are well-suited to implementing software components, they fail to shine in the construction of component-based applications, largely because object-oriented design tends to obscure a component-based architecture. We propose to tackle this problem by clearly separating component implementation and composition. Piccola is a small "composition language" that embodies the paradigm of "applications = components + scripts." Piccola models components and composition abstractions by means of a unifying foundation of communicating concurrent agents. Flexibility and extensibility are obtained by modelling both interfaces to components and the contexts in which they live by extensible records, or "forms". We illustrate the realization of an architectural style in Piccola and show how external components may be adapted and composed according to the style. We show how separating components from their composition can improve maintainability.

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