Abstract
Telecommunication services are often implemented to maintain their state in persistent storage. The application logic program then has no state variables of its own; it is seeded with a state depending on call context. Superficially, this contradicts the notion of extended state machines as they are defined by SDL-processes, where the state is part of the state machine. This paper presents an approach to separate state from program logic that is transparent to the SDL designer. This approach has been implemented in the SITE SDL runtime system in co-operation with Siemens, Berlin.
We would like to thank our partners at Siemens, in particular Mr. Andreas Vogel, for the numerous ideas and suggestions that lead to the technology described in this paper.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
ITU-T. Recommendation Z.100 (11/99)-Specification and description language (SDL). Geneval, 1999.
Mitschele-Thiel. Systems Engineering With SDL: Developing Performance-Critical Communications Systems. JW Wiley, 2001.
Hennessy, Patterson. Computer Architecture: A Quantitative Approach. Morgan Kaufmann Publishers, 1996.
SDL Integrated Tool Environment of Humboldt University Berlin: http://www. informatik.hu-berlin.de/Themen/SITE
ITU-T. Recommendation X.680 (12/97)-Information technology-Abstract Syntax Notation One (ASN.1): Specification of basic notation. Geneva, 1997.
ITU-T. Recommendation X.690 (12/97)-Information technology-ASN.1 encoding rules-Specification of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER). Geneva, 1997.
ITU-T. Recommendation Z.105 (11/99)-SDL combined with ASN.1 modules (SDL/ASN.1). Geneva, 1999.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2001 Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Courzakis, V., von Löwis, M., Schröder, R. (2001). Using SDL in a Stateless Environment. In: Reed, R., Reed, J. (eds) SDL 2001: Meeting UML. SDL 2001. Lecture Notes in Computer Science, vol 2078. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-48213-X_20
Download citation
DOI: https://doi.org/10.1007/3-540-48213-X_20
Published:
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-42281-5
Online ISBN: 978-3-540-48213-0
eBook Packages: Springer Book Archive