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Constraint meta-object: A new object model for distributed collaborative designing

IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS PART A-SYSTEMS AND HUMANS 1997年第2期27卷 208-221页

作者： Ram, DJ Vivekananda, N Rao, CS Mohan, NK Distributed and Object Systems Group Department of Computer Science and Engineering Indian Institute of Technology Chennai India

object databases have been recognized as providing rich data modeling capabilities for the next generation applications, especially CAD/CAM, software engineering, and multimedia, The core object model consisting of objects, messages and inheritance, however, is not adequate to tackle all the requirements of these applications, Since collaborative activity is one of the key features of next-generation applications, it is essential that the basic object model be extended to support collaborative activity, We propose an object model for collaborative designing based on objects and constraint meta-objects. Each design object has an associated constraint space consisting of one or more constraint meta objects. The object/constraint meta-object separation achieves a clear distinction between design object and its associated design environment and provides a framework for supporting collaboration among members of a design team, Collaboration is modeled as dependencies among multiple constraint spaces on different nodes, and collaborative activity as design transactions satisfying local constraints and propagating constraints among interrelated constraint spaces, We propose language extensions to C++ for capturing the object/constraint meta-object paradigm. The extensions are implemented using filters, a special mechanism for capturing messages sent to an object, Our model has been applied to the case of a mechanical CAD problem.

关键词： collaborative designing computer-aided design (CAD) computer-supported collaborative work (CSCW) constraint meta-object distributed object databases

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