A. Bjørnerstedt and S. Britts. AVANCE - an object management system. In Proceedings of the Conference on Object-Oriented Systems, Languages and Applications (OOPSLA), San Diego, California, USA, pages 206--221, September 1988.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....two different approaches to dynamically changing a database schema. Schema evolution ( BKKK87, MSOP86, LH90, BBB 88, Bar91, TS92] systems tend to focus on how changes to the schema are described and ways of ensuring that changes do not invalidate the database contents. Versioning approaches ( BB88, SZ86, Zdo90, MS93, Cla92, Bra93] focus on how to allow multiple versions of an object to co exist at run time. The most obvious similarity between such database systems and DRASTIC is that a process booted over a DRASTIC platform with a persistent store must be able to access the state in the ....

A. Bjørnerstedt and S. Britts. AVANCE - an object management system. In Proceedings of the Conference on Object-Oriented Systems, Languages and Applications (OOPSLA), San Diego, California, USA, pages 206--221, September 1988.

....interest to (all) other objects that use its services. Therefore, it is desirable to define views on an object, differentiating between clients, for better information hiding and improved structuring of object relationships. In languages such as C [Ellis 90] Trellis Owl [Schaffert 86] and PAL [Bj rnerstedt 88] multiple views can be defined by the programmer with respect to the different clients of an object. These mechanisms in general only distinguish between the following categories of clients; the object itself, the descendants of an object, and other client objects. However, they do not allow any ....

....of atomic delegation [Aksit 91] Durability is separated from transactions, and provided as object persistence. Transactions provided by databases are typically defined in some query language, for a sequence of database operations. Only a few languages, such as Argus [Liskov 87] and Avance [Bj rnerstedt 88] support transactions, which are called atomic actions, as a general mechanism in the language for preserving consistency of concurrently accessed resources. Most object oriented systems provide transactions for a program block by delimiting it with begin transaction and end transaction like ....

A. Björnerstedt & S. Britts, AVANCE: An Object Management System, OOPSLA '88, pp. 206-221

....variable, or simply aborting an unsuccessful operation. In spite of their overhead, class versioning techniques have proved indispensable in important domains like CAD CAM and Office Information Systems. They have therefore been integrated in object oriented systems such as Orwell [42] AVANCE [5], ORION [1] and IRIS [2] Class reorganization Class evolution is intimately linked with class design. Suppose programmers build applications chiefly in a bottom up fashion by reusing existing classes. Classes may then require adaptations so that they fully suit the needs of software ....

Björnerstedt, A., and Britts, S. AVANCE: An Object Management System. Proc. OOPSLA'88 (Sept. 1988), 206-221.

....monitors must be judiciously utilized to achieve object protection. 2. The Heterogeneous approach: both data objects similar to those found in sequential languages and protected concurrent objects are supported. The protection of concurrent objects may be accomplished by transactions, as in PAL [3], or by considering such objects as being active, as in the following approach. 3. The Homogeneous approach: threads are explicitly associated with objects, instead of being an independent programming construct. Hybrid [23] POOL T [2] and ABCL 1 [32] fall into this category. Objects conforming to ....

A. Björnerstedt and S. Britts, "AVANCE: An Object Management System," ACM SIGPLAN Notices, Proceedings OOPSLA '88, vol. 23, no. 11, pp. 206-221, Nov 1988.

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Björnerstedt, A and S Britts. AVANCE: An Object Management System. In OOPSLA'88, 206-221. 1988.

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