Theory and Practice of Object Systems最新文献

Designing object systems for evolution 为进化设计对象系统

Theory and Practice of Object Systems Pub Date : 1997-10-01 DOI: 10.1002/(SICI)1096-9942(1997)3:4<265::AID-TAPO4>3.0.CO;2-R

K. Mätzel, W. Bischofberger

引用次数: 11

Maintenance of object-oriented systems during structural evolution 在结构演变过程中维护面向对象的系统

Theory and Practice of Object Systems Pub Date : 1997-09-01 DOI: 10.1002/(SICI)1096-9942(1997)3:3<185::AID-TAPO2>3.0.CO;2-T

Paul L. Bergstein

{"title":"Maintenance of object-oriented systems during structural evolution","authors":"Paul L. Bergstein","doi":"10.1002/(SICI)1096-9942(1997)3:3<185::AID-TAPO2>3.0.CO;2-T","DOIUrl":"https://doi.org/10.1002/(SICI)1096-9942(1997)3:3<185::AID-TAPO2>3.0.CO;2-T","url":null,"abstract":"We have previously developed a mathematical treatment of a calculus for class transformations that preserve or extend a set of objects. Methods for automating the maintenance of structural and behavioral consistency in systems based on evolving class structures have been provided for the object-preserving and object-extending transformations. This work extends the calculus of class transformations to include certain transformations that reflect not only the extension and reclassification of existing objects, but also structural changes (other than addition of attributes) in the original objects. Language-preserving transformations are a special case of transformations that change the structure of existing objects. If an object schema is decorated with concrete syntax, it defines not only a class structure, but also a language for describing the objects. When two schemas define the same language but different classes, the language may be used to guide the transportation of functionality between domains. The languagepreserving transformations defined here form the basis of a complete transformation system for a subset of class graphs powerful enough to express the regular languages. c 1997 John Wiley & Sons","PeriodicalId":162930,"journal":{"name":"Theory and Practice of Object Systems","volume":"363 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126700026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 22

A formal model of views for object-oriented database systems 面向对象数据库系统的正式视图模型

Theory and Practice of Object Systems Pub Date : 1997-09-01 DOI: 10.1002/(SICI)1096-9942(1997)3:3<157::AID-TAPO1>3.3.CO;2-M

G. Guerrini, E. Bertino, B. Catania, Jesús García-Molina

{"title":"A formal model of views for object-oriented database systems","authors":"G. Guerrini, E. Bertino, B. Catania, Jesús García-Molina","doi":"10.1002/(SICI)1096-9942(1997)3:3<157::AID-TAPO1>3.3.CO;2-M","DOIUrl":"https://doi.org/10.1002/(SICI)1096-9942(1997)3:3<157::AID-TAPO1>3.3.CO;2-M","url":null,"abstract":"The de nition of a view mechanism is an important issue for object-oriented database systems, in order to provide a number of features that are crucial for the development of advanced applications. Due to the complexity of the data model, the object-oriented paradigm introduces new problems in the de nition of a view mechanism. Several approaches have been de ned, each de ning a particular view mechanism tailored to a set of functionalities that the view mechanism should support. In particular, views can be used as shorthand in queries, can support the de nition of external schemas, can be used for content-dependent authorization, and, nally, can support some form of schema evolution. In this paper, we formally introduce a view model for object-oriented databases. Our view model is comparable to existing view models for what concerns the supported features; however, our model is the only one for which a formal de nition is given. This formal de nition of object-oriented view mechanisms is useful both for understanding what views are and as a basis for further investigations on view properties. The paper introduces the model, discussing all the supported features both from a theoretical and practical point of view. A comparison of our model with other models is also presented.","PeriodicalId":162930,"journal":{"name":"Theory and Practice of Object Systems","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126350711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 50

Inheritance anomaly in CORBA multithreaded environments CORBA多线程环境中的继承异常

Theory and Practice of Object Systems Pub Date : 1900-01-01 DOI: 10.1002/(SICI)1096-9942(1997)3:1<45::AID-TAPO5>3.0.CO;2-6

Pedro de las Heras Quirs, J. Milln

引用次数: 3

OO Databases and applications (selected papers from ICDE'98) 面向对象数据库与应用(1998年ICDE论文选集)

Theory and Practice of Object Systems Pub Date : 1900-01-01 DOI: 10.1002/(SICI)1096-9942(1999)5:3<125::AID-TAPO1>3.0.CO;2-1

E. Bertino, S. Urban, Elke A. Rundensteiner

引用次数: 0