EPICS : Extensible record and device support.

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Although the design of extensible support was not intentionally object oriented, the design does have an object-oriented flavor. Here we discuss the good and bad aspects of using object-oriented ideas. Since the structures generated from a Record Description File contain only data and not methods, they are not similar to Java or C++ classes. Because methods are not present, a clear separation between static and run-time database access is possible. This is a good feature and should be kept. It also allows generation of C structures that can be used by either C or C++ code. The record and device ... continued below

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4 p.

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Dalesio, L. R. & Kraimer, M. R. November 18, 1997.

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Description

Although the design of extensible support was not intentionally object oriented, the design does have an object-oriented flavor. Here we discuss the good and bad aspects of using object-oriented ideas. Since the structures generated from a Record Description File contain only data and not methods, they are not similar to Java or C++ classes. Because methods are not present, a clear separation between static and run-time database access is possible. This is a good feature and should be kept. It also allows generation of C structures that can be used by either C or C++ code. The record and device support entry tables are almost like Java interfaces or pure abstract C++ classes. We can state that EPICS databases are defined via a Database Definition Language and an Abstract Interface Definition. The two main shortcomings of the existing implementation are (1) only two interfaces are defined RSETS and DSETS (actually a third called a driver entry table is also defined), and (2) the way hardware links are implemented makes it extremely difficult to support arbitrary bus types and additional hardware configuration information.

Physical Description

4 p.

Notes

OSTI as DE00008887

Medium: P; Size: 4 pages

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  • International Conference on Accelerator and Large Experimental Physics '97, Bejing (CN), 11/03/1997--11/07/1997

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  • Report No.: ANL/ASD/CP-94938
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 8887
  • Archival Resource Key: ark:/67531/metadc794301

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Office of Scientific & Technical Information Technical Reports

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  • November 18, 1997

Added to The UNT Digital Library

  • Dec. 19, 2015, 7:14 p.m.

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  • April 10, 2017, 7:55 p.m.

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Dalesio, L. R. & Kraimer, M. R. EPICS : Extensible record and device support., article, November 18, 1997; Illinois. (digital.library.unt.edu/ark:/67531/metadc794301/: accessed June 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.