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object database support for a software project management environment

ACM SIGPLAN Notices 1988年第2期24卷 85-96页

作者： Liu, Lung-Chun Horowitz, Ellis Univ. of Southern Los AngelesCA60029311 United States

The recent development of object-oriented database models, which combine the power of object programming and the efficient management of data, provides a feasible solution for the construction of a computer-aided software engineering environment or CASE. However, an object oriented database provides only a kernel set of capabilities. This paper identifies the data management requirements related to software project management and shows how they are represented in the model called Design-Net. Then it is shown how the concepts of the work breakdown structure, project history, event monitoring, and re-initiation of tasks are realized in a specific object-oriented system. Limitations of existing object oriented database systems are identified, with respect to implementing these concepts. Based upon an actual prototype, recommendations are made for enhancing future object-oriented systems. © 1988 ACM.

关键词： object-oriented databases

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Class modification in the GemStone object-oriented DBMS 87

Class modification in the GemStone object-oriented DBMS

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1987 Conference on object oriented Programming Systems Languages and Applications, OOPSLA 1987

作者： Penney, D. Jason Stein, Jacob Servio Logic Corporation 15025 S.W. Koll Parkway 1a BeavertonOR97006 United States

ISBN: (纸本)0897912470

We are currently designing a class modification methodology for GemStone. We describe the current status of the design. We choose from two basic approaches and then Introduce those aspects of Gem-Stone necessary for an understanding of the paper. After defining a set of invariants for GemStone databases, we discuss specific class modification operations in terms of maintaining these Invariants. We next discuss several issues that impact class modification. These issues include concurrency and authorization, and lead to difficult choices. © 1987 ACM.

关键词： object-oriented databases

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An object-oriented system for engineering applications 87

An object-oriented system for engineering applications

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1987 ACM SIGMOD International Conference on Management of Data, SIGMOD 1987

作者： Kemper, Alfons Lockemann, Peter C. Wallrath, Mechtild Univ. Karlsruhe Institut fur Informatik II Karlsruhe7500 Germany

ISBN: (纸本)9780897912365

One of the most promising approaches to database support of engineering applications is the concept of object-oriented database management. object-orientation is usually approached from either a behavioral or structural viewpoint. The former emphasizes the application-specific manipulation of technical objects while hiding their structural details whereas the latter concentrates on the structural aspects and their efficient implementation. The thesis of the paper is that the two viewpoints may enter into a fruitful symbiosis where a behaviorally object-oriented system is implemented on top of a structurally object-oriented database system, thereby combining ease of use by the engineer with high database system performance. The thesis will be demonstrated in the paper by a user-friendly interface based on user-definable abstract datatypes and its implementation using a prototype for the non-first-normal-form (NF2) relational model, and will be supported by an engineering example application from off-line robot programming. © 1987 ACM.

关键词： object-oriented databases

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A network environment for computer-supported cooperative work 87

A network environment for computer-supported cooperative wor...

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1987 ACM Workshop on Frontiers in Computer Communications Technology, SIGCOMM 1987

作者： Whitescarver, James Mukherji, Prithviraj Turoff, Murray DeBlock, Ronald J. Czech, Robert M. Paul, Bijoy K. New Jersey Institute of Technology United States

ISBN: (纸本)0897912454

A second generation computer supported cooperative work system called Electronic Information Exchange System (EIES2) is described in this paper. The EIES2 communications environment allows users to network across geographical constraints using asynchronous or synchronous communications. The architecture of the network environment is decentralized, and is implemented using modern standards, and an easy-to-use user interface. At the heart of EIES2 is a high-level, object oriented pseudo machine which incorporates a distributed, communications-oriented database. The set of tools provided by the EIES2 communications environment is well suited for implementing group communication systems that have an extensive set of user features built into it. These tools are well suited to support the group communication model described by the AMIGO task force (IFIP 6.5 and ISO TC97/SC18/WG64). The EIES2 application layer protocols, using CCITT/ISO X.410 Remote Operations, support a distributed object oriented database. © 1988 ACM.

关键词： object-oriented databases

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object-oriented database support for software environments 87

Object-oriented database support for software environments

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1987 ACM SIGMOD International Conference on Management of Data, SIGMOD 1987

作者： Hudson, Scott E. King, Roger Univ. of Arizona Department of Computer Science TucsonAZ85721 United States Univ. of Colorado Department of Computer Science BoulderCO80309 United States

ISBN: (纸本)9780897912365

Cactis is an object-oriented, multi-user DBMS developed at the University of Colorado. The implementation is self-adaptive and concurrent, and runs in the Unix/C Sun workstation environment. A central, unique focus of Cactis is the support of functionally-defined data in a manner which provides good performance. Cactis is intended for use in applications which are conducive to an object-oriented approach and involve derived data. Such applications include software *** supports the construction of objects and type/subtype hierarchies, which are useful for managing the complex and highly-interrelated data found in software environments. Such data types include programs, requirement specifications, milestone reports, configurations, documentation, and many others. Cactis uses techniques based on attributed graphs to ensure that functionally-defined attributes of objects, such as compilation dependencies, cost calculations, and milestone dependencies can be maintained efficiently. Since it is necessary to dynamically add new tools (such as debuggers and compilers) to a software environment, the DBMS allows the user to extend the type structure. The system also supports an efficient rollback and recovery mechanism, which provides the framework for a software version facility. © 1987 ACM.

关键词： object-oriented databases

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Issues in the design of object-oriented database programming languages 87

Issues in the design of object-oriented database programming...

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1987 Conference on object oriented Programming Systems Languages and Applications, OOPSLA 1987

作者： Bloom, Toby Zdonik, Stanley B. MIT Laboratory for Computer Science United States Brown University Department of Computer Science United States

ISBN: (纸本)0897912470

We see a trend toward extending object-oriented languages in the direction of databases, and, at the same time, toward extending database systems with object-oriented ideas. On the surface, these two activities seem to be moving in a consistent direction. However, at a deeper level, we see difficulties that may inhibit their ending up at the same point. We feel that many of these difficulties are a result of the underlying assumptions that are inherent in the fields of programming language and database systems research. Many of these assumptions are historical and contribute to a set of cultural biases that often prevent the two communities from interacting as effectively as possible. © 1987 ACM.

关键词： object-oriented databases

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Intermedia: A case study of the differences between relational and object-oriented database systems 87

Intermedia: A case study of the differences between relation...

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1987 Conference on object oriented Programming Systems Languages and Applications, OOPSLA 1987

作者： Smith, Karen E. Zdonik, Stanley B. Institute for Research in Information and Scholarship Brown University ProvidenceRI02912 United States Department of Computer Science Brown University ProvidenceRI02912 United States

ISBN: (纸本)0897912470

This paper compares two approaches to meeting the data handling requirements of Intermedia, a hypermedia system developed at the Institute for Research in Information and Scholarship at Brown University. Intermedia, though written using an object-oriented programming language, relies on a traditional relational database management system for data storage and retrieval. We examine the ramifications of replacing the relational database with an object-oriented database. We begin by describing the important characteristics each database system. We then describe Intermedia and give an overview of its architecture and its data handling requirements. We explain why and how we used a relational database management system and the problems that we encountered with this system. We then present the design of an object-oriented database schema for Intermedia and compare the relational and object-oriented database management system approaches. © 1987 ACM.

关键词： object-oriented databases

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Version management in an object-oriented database

Version management in an object-oriented database

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International Workshop on Advanced Programming Environments, 1986

作者： Zdonik, Stanley B. Brown University ProvidenceRI02912 United States

ISBN: (纸本)9783540171898

We describe a database system that includes a built-in version control mechanism that can be used in the definition of any new object types. This database system is object-oriented in the sense that it supports data abstraction, object types, and inheritance. We show how this version control mechanism can be used to manage change in the definition of a system. In particular, we show how versions of type defining objects serve to maintain consistent behavior of objects as the system evolves over time. We also show how the system can use other information such as the component-of relationship to propagate changes to the appropriate places. The version mechanism is also used to control consistency during the process of design. The notions of consistency surface, design step, and slice are introduced. The version mechanism also gives us a way of potentially tolerating more concurrency than in conventional systems. © 1986, Springer-Verlag.

关键词： object-oriented databases

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Version modeling concepts for computer-aided design databases 86

Version modeling concepts for computer-aided design database...

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1986 ACM SIGMOD International Conference on Management of Data, SIGMOD 1986

作者： Katz, Randy H. Chang, Ellis Bhateja, Rajiv Computer Science Division Electrical Engineering and Computer Science Department University of California Berkeley BerkeleyCA94720 United States

ISBN: (纸本)0897911911

We describe a semantic object-oriented data model for representing how a complex design database evolves over time Structural relationships, introduced by the data management system, are imposed on the objects created by existing CAD tools The relationships supported by the model are (1) version histories, (2) time-varying configurations, and (3) equivalences among objects of different types We describe mechanisms for (1) identifying current versions, (2) supporting dynamic configuration binding, and (3) verifying equivalence relationships The data model is being implemented in a Version Server, under development at the University of California, Berkeley. © 1986 ACM.

关键词： object-oriented databases

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The management of changing types in an object-oriented database 86

The management of changing types in an object-oriented datab...

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Conference on object-oriented Programming Systems, Languages and Applications, OOPSLA 1986

作者： Skarra, Andrea H. Zdonik, Stanley B. Department of Computer Science Brown University ProvidenceRI02012 United States

ISBN: (纸本)0897912047

We examine the problem of type evolution in an object- oriented database environment. Type definitions are persistent objects in the database and as such may be modified and shared. The effects of changing a type extend to objects of the type and to programs that use objects of the type. We propose a solution to the problem through an extension of the semantic data model. A change in the interface defined by a type may result in errors when programs use new or old objects of the type. Through the use of an abstraction of the type over time, timestamping and error handling mechanisms provide support for the type designer in creating compatible versions of the type. The mechanisms are incorporated into the behavior defined by the type and are Inherited via the type-lattice. © 1986 ACM.

关键词： object-oriented databases

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