Computational Reflection in Object-Oriented Concurrent Computing and its Applications

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1. An Object-oriented Concurrent Language ABCL/R which is able to describe reflective computation was designed and its preliminary implementation has been completed. [1]2. We leaned a new notion called "Group-Wide Reflection" which is the reflective capability for a group of concurrent objects as a whole. [4, 5, 9]3. An Actor-based reflective model and language ACT/R was designed, which have the group-wide reflective capability. [4, 5, 9]4. Various results including correctness of the reflective model have been obtained by analyzing the notion of Group-Wide Reflection. [4, 5, 9]5. A prototype implementation of ACT/R was completed.6. We defined a new reflective notion called "Hybrid Group Reflection" by incorporating the results of our research on Group-Wide Reflection into our language ACT/R. [6, 13, 14]7. In conventional languages, important aspects of parallel computation such as scheduling and shared resource coordination could only be programmed in an ad hoc way. Our research resul … More ts enabled us to model and program such aspects of parallel computation in reflective (user) languages. Using our reflective language, we also showed that controlling and programming such aspects of parallel discrete event simulation can be done in a very succinctly way in the same language as the simulation is written. [13, 14, 11]8. Our implementation of ABCL/R2 on a multi-processor workstation Omuron Luna88k demonstrated the effectiveness of the use of reflective capability in programming parallel discrete event simulation.9. Using examples, we showed that the reflective capability provides an effective means for coping with the inheritance anomaly problem. [6]10. The runtime kernel for an object-oriented concurrent language includes not only its intermediate-code interpreter, method dispatcher, and garbage collector, but also its scheduler and inter-node communication facilities. It is often the case in distributed computing environments that the behavior of the runtime k. emel needs to be adaptive according to its execution environment. For this purpose, we constructed a reflective architecture system called RbCl the almost all runtime facilities of which can be dynamically replaceable with user-defined ones. [8, 11]Other Contributions : - International Workshops -Two of our research members, Satoshi Matsuoka and Takuo Watanabe, organized (as program committee members) the following two international workshops :1. ECOOP/OOPSLA'90 Workshop on Reflection and Metalevel Architectures in Object-Oriented Programming, Ottawa, October 21 1990.2. OOPSLA'90 Workshop on Reflection and Metalevel Architectures in Object-Oriented Programming, Phoenix, October 7, 1991. Less