This Article 
   
 Share 
   
 Bibliographic References 
   
 Add to: 
 
Digg
Furl
Spurl
Blink
Simpy
Google
Del.icio.us
Y!MyWeb
 
 Search 
   
An Object-Oriented Command Language
January 1983 (vol. 9 no. 1)
pp. 1-8
R. Snodgrass, Department of Computer Science, University of North Carolina
This paper describes Cola, an object-oriented command language for Hydra; Hydra is a capability-based operating system that runs on C.mmp, a tightly coupled multiprocessor. The two primary aspects of Cola, that it is a command language for Hydra, and that it is based on the object paradigm, are examined. Cola was designed to effect a correspondence between capabilities in Hydra and objects that are supported by the language. Cola is based on Smalltalk in that it uses message-passing as a control structure to allow syntactic freedom in the expression of commands to the system. Cola objects are arranged in a hierarchy, and the message-passing mechanism was designed to exploit this structure by automatically forwarding an unanswered message up the hierarchy. Two ramifications of this mechanism, automatic inheritance and shadowing, are discussed. An evaluation of the design decisions is also given.
Index Terms:
Smalltalk, Capabilities, command language, knowledge representation languages, message-passing, multiprocessors, object-based languages, object hierarchies, Simula
Citation:
R. Snodgrass, "An Object-Oriented Command Language," IEEE Transactions on Software Engineering, vol. 9, no. 1, pp. 1-8, Jan. 1983, doi:10.1109/TSE.1983.236163
Usage of this product signifies your acceptance of the Terms of Use.