NDLI: Polymorphic identifiers:uniform resource access in objective-smalltalk

Content Provider	ACM Digital Library
Author	Hirschfeld, Robert Weiher, Marcel
Abstract	In object-oriented programming, polymorphic dispatch of operations decouples clients from specific providers of services and allows implementations to be modified or substituted without affecting clients. The Uniform Access Principle (UAP) tries to extend these qualities to resource access by demanding that access to state be indistinguishable from access to operations. Despite language features supporting the UAP, the overall goal of substitutability has not been achieved for either alternative resources such as keyed storage, files or web pages, or for alternate access mechanisms: specific kinds of resources are bound to specific access mechanisms and vice versa. Changing storage or access patterns either requires changes to both clients and service providers and trying to maintain the UAP imposes significant penalties in terms of code-duplication and/or performance overhead. We propose introducing first class identifiers as polymorphic names for storage locations to solve these problems. With these Polymorphic Identifiers, we show that we can provide uniform access to a wide variety of resource types as well as storage and access mechanisms, whether parametrized or direct, without affecting client code, without causing code duplication or significant performance penalties.
Starting Page	61
Ending Page	72
Page Count	12
File Format	PDF
ISSN	03621340 15581160
DOI	10.1145/2578856.2508169
Journal	ACM SIGPLAN Notices (SIGP)
Volume Number	49
Issue Number	2
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1983-05-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Rest Extensibility Identifiers Uniform access principle
Content Type	Text
Resource Type	Article
Subject	Computer Graphics and Computer-Aided Design Software

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