Download Advanced Database Systems: 10th British National Conference by Michael L. Brodie (auth.), Peter M. D. Gray, Rob J. Lucas PDF

By Michael L. Brodie (auth.), Peter M. D. Gray, Rob J. Lucas (eds.)

The subject of this booklet is the possibility of new complex database platforms. the quantity offers the complaints of the tenth British nationwide convention on Databases, held in Aberdeen, Scotland, in July 1992. the quantity comprises invited papers, one at the promise of dispensed computing andthe demanding situations of legacy platforms via M.L. Brodie, and the opposite on object-oriented necessities catch and research and the Orca undertaking by means of D.J.L. Gradwell. the subsequent 4 elements every one comprise 3 submitted papers chosen from a complete of 36 submissions. The components are entitled: - Object-oriented databases - Parallel implementationsand commercial platforms - Non-relational info types - common sense programming and databases

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Additional resources for Advanced Database Systems: 10th British National Conference on Databases, BNCOD 10 Aberdeen, Scotland, July 6–8, 1992 Proceedings

Sample text

One could store it together with the object fields or in the object handle. Storing it in the handle has the advantage to be reference-specific. Another interesting idea is to generate the slot only when needed, as in MetaBeta with dynamic slots [3]. We have not investigated yet if this mechanism can be implemented efficiently in a JVM. Storing the metaobject reference in the handle means an additional memory consumption in the handle space of 50%. This also applies for VMs where references point directly to the object, without going through a handle.

This happens when the monitorenter/monitorexit bytecodes are executed or a synchronized static method of the class is called. We stated above that shadowing must be transparent to the base level. Therefore the locks of C and C’ must be identical. So, metaXa uses the class object of the class structure pointed to by the type link for locking. Garbage Collection. e. when the metaobject is detached. The garbage collector follows the baselevel link (Fig. 2) to mark classes in the tower of shadow classes (tower of metaobjects).

The object and the proxy need not even provide the same interface. The proxy object only defines the “doesNotUnderstand” method, which is called by the Smalltalk runtime if the called method is not implemented by the receiver. Smalltalk systems implement the method invocation mechanism in a way that adds only little overhead when using the “doesNotUnderstand” method. 4 M. Golm and J. Kleinoeder The VM approach Being able to extend the JVM provides complete functionality while preserving transparency.

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