An actor-based metalevel architecture for group-wide reflection.pdf

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An actor-based metalevel architecture for group-wide reflection.pdf

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An actor-based metalevel architecture for group-wide reflection

To appear in Proc. REX School/Workshop on Foundations of Object-Oriented Languages, Noordwijkerhout, the Netherlands, May, 1990, Lecture Notes in Computer Science (forthcoming) An Actor-Based Metalevel Architecture for Group-Wide Re ection Takuo Watanabe Department of Information Science Tokyo Institute of Technology JSPS Fellow (DC) takuo@is.s.u-tokyo.ac.jp Akinori Yonezawa Department of Information Science The University of Tokyo yonezawa@is.s.u-tokyo.ac.jp Abstract The notion of group-wide re ection is presented. Group-wide re ection, a dimen- sion of computational re ection in concurrent systems, allows each computational agent (actor/object/process) to reason about and act upon not only the agent itself, but also a group of agents which may contain the agent itself. Global properties of the group can be dynamically controlled through group-wide re ection. We have developed a simple yet general model for group-wide re ection based on the Actor model[1]. An operational semantics of a group of object-level actors is represented by another group of actors (a group of metalevel actors), which is an implementation of a transition system of the object-level group. We prove that the metalevel group correctly represents the operational semantics of the group in terms of transitions of congurations. Furthermore, migration of an actor from node to node is described as an example of group-wide re ection. Keywords re ection, group-wide re ection, actor model, object-oriented concurrent program- ming, object-group, ABCL/R, ABCL/1 1 Introduction Our research goal is to construct a solid basis for programming adaptive/self-evolving computational systems. We believe that object-oriented concurrent computation with re ection provides a suitable framework for this goal. The motivation of group-wide re ection is to cope with the following issues. Contact Address: Department of Information Science, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, JAPAN, 113, TEL/FAX: +81-