Gay, S. J. , Gesbert, N., Ravara, A. and Vasconcelos, V. T. (2015) Modular session types for objects. Logical Methods in Computer Science, 11(4), 12. (doi: 10.2168/LMCS-11(4:12)2015)
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Abstract
Session types allow communication protocols to be specified type-theoretically so that protocol implementations can be verified by static type checking. We extend previous work on session types for distributed object-oriented languages in three ways. (1) We attach a session type to a class definition, to specify the possible sequences of method calls. (2) We allow a session type (protocol) implementation to be modularized, i.e. partitioned into separately-callable methods. (3) We treat session-typed communication channels as objects, integrating their session types with the session types of classes. The result is an elegant unification of communication channels and their session types, distributed object-oriented programming, and a form of typestate supporting non-uniform objects, i.e. objects that dynamically change the set of available methods. We define syntax, operational se-mantics, a sound type system, and a sound and complete type checking algorithm for a small distributed class-based object-oriented language with structural subtyping. Static typing guarantees that both sequences of messages on channels, and sequences of method calls on objects, conform to type-theoretic specifications, thus ensuring type-safety. The language includes expected features of session types, such as delegation, and expected features of object-oriented programming, such as encapsulation of local state.
| Item Type: | Articles |
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| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Gesbert, Dr Nils and Gay, Professor Simon |
| Authors: | Gay, S. J., Gesbert, N., Ravara, A., and Vasconcelos, V. T. |
| College/School: | College of Science and Engineering > School of Computing Science |
| Journal Name: | Logical Methods in Computer Science |
| Publisher: | International Federation of Computational Logic |
| ISSN: | 1860-5974 |
| ISSN (Online): | 1860-5974 |
| Copyright Holders: | Copyright © 2015 The Authors |
| First Published: | First published in Logical Methods in Computer Science 11(4):12 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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