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Data Management in Component-Based   Embedded Real-Time Systems
Mälardalen University, School of Innovation, Design and Engineering. (Model-Based Engineering of Embedded Systems)
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis presents new data management techniques for run-time data in component-based embedded real-time systems. These techniques enable data to be modeled, analyzed and structured to improve data management during system development, maintenance, and execution. The foundation of our work is a case-study that identifies a number of problems with current state-of-practice in data management for industrial embedded real-time systems.

We introduce two novel concepts: the data entity and the database proxy. The data entity is a design-time concept that allows designers to manage data objects throughout different design and maintenance activities. It includes data-type specification, documentation, specification of timing and quality properties, tracing of dependencies between data objects, and enables analysis and automated validation.

The database proxy is a run-time concept designed to allow the use of state-of-the-art database technologies in contemporary software-component technologies for embedded systems. Database proxies decouple components from an underlying database residing in the component framework. This allows components to remain encapsulated and reusable, while providing temporally predictable access to data maintained in a database, thus enabling the use of database technologies, which has previously excluded, in these systems.

To validate our proposed techniques, we present a tool implementation of the data entity as well as implementations of the database proxy approach, using commercial tools, the AUTOSAR standardized automotive software architecture, and automotive hardware.  Our results show that the presented techniques can contribute to the development of future component-based embedded real-time systems, by providing structured and efficient data management.

Place, publisher, year, edition, pages
Västerås: Mälardalen University , 2012.
Series
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 125
National Category
Computer and Information Science
Research subject
Computer Science
Identifiers
URN: urn:nbn:se:mdh:diva-14511ISBN: 978-91-7485-064-2 OAI: oai:DiVA.org:mdh-14511DiVA: diva2:517486
Public defence
2012-06-01, Gamma, Mälardalen University, Västerås, 13:00 (English)
Opponent
Supervisors
Available from: 2012-04-26 Created: 2012-04-23 Last updated: 2012-05-10Bibliographically approved
List of papers
1. Design-Time Management of Run-Time Data in Industrial Embedded Real-Time Systems Development
Open this publication in new window or tab >>Design-Time Management of Run-Time Data in Industrial Embedded Real-Time Systems Development
2008 (English)In: Proceedings of 13th IEEE International Conference on Emerging Technologies and Factory Automation (ETFA'08), IEEE Industrial Electronics Society, Hamburg, Germany, 2008, 1285-1293 p.Conference paper, (Refereed)
Abstract [en]

Efficient design-time management and documentation of run-time data elements are of paramount importance when developing and maintaining modern real-time systems. In this paper, we present the results of an industrial case-study in which we have studied the state of practice in data management and documentation. Representatives from five companies within various business segments have been interviewed and our results show that various aspects of current data management and documentation are problematic and not yet mature. Results show that companies today have a fairly good management of distributed signals, while internal ECU signals and states are, in many cases, not managed at all. This lack of internal data management results in costly development and maintenance and is often entirely dependent of the know-how of single individual experts.

Furthermore, it has, in several cases, resulted in unused and excessive data in the systems due to the fact that

whether or not a data is used is unknown.

National Category
Computer and Information Science
Identifiers
urn:nbn:se:mdh:diva-7225 (URN)10.1109/ETFA.2008.4638566 (DOI)000260495500208 ()2-s2.0-56349134398 (Scopus ID)978-1-4244-1506-9 (ISBN)978-1-4244-1505-2 (ISBN)
Conference
13th IEEE International Conference on Emerging Technologies and Factory Automation Location: Hamburg, GERMANY Date: SEP 15-18, 2008
Available from: 2009-09-25 Created: 2009-09-25 Last updated: 2013-12-03Bibliographically approved
2. A Data-Entity Approach for Component-Based Real-TimeEmbedded Systems Development
Open this publication in new window or tab >>A Data-Entity Approach for Component-Based Real-TimeEmbedded Systems Development
2009 (English)In: 14th IEEE International Conference on Emerging Technology and Factory Automation, 2009Conference paper, (Refereed)
Abstract [en]

In this paper the data-entity approach for efficientdesign-time management of run-time data in componentbasedreal-time embedded systems is presented. The approachformalizes the concept of a data entity which enabledesign-time modeling, management, documentationand analysis of run-time data items. Previous studies ondata management for embedded real-time systems showthat current data management techniques are not adequate,and therefore impose unnecessary costs and quality problemsduring system development. It is our conclusion thatdata management needs to be incorporated as an integralpart of the development of the entire system architecture.Therefore, we propose an approach where run-time datais acknowledged as first class objects during developmentwith proper documentation and where properties such asusage, validity and dependency can be modeled. In thisway we can increase the knowledge and understanding ofthe system. The approach also allows analysis of data dependencies,type matching, and redundancy early in the developmentphase as well as in existing systems.

Keyword
Data management, real-time systems, real-time database, component
National Category
Engineering and Technology
Identifiers
urn:nbn:se:mdh:diva-7511 (URN)10.1109/ETFA.2009.5347028 (DOI)2-s2.0-77949955302 (Scopus ID)9781424427284 (ISBN)
Conference
2009 IEEE Conference on Emerging Technologies and Factory Automation, ETFA 2009; Mallorca; Spain; 22 September 2009 through 26 September 2009
Note

©2009 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE

Available from: 2009-11-20 Created: 2009-11-19 Last updated: 2013-12-03Bibliographically approved
3. Data Management for Component-Based Embedded Real-Time Systems: the Database Proxy Approach
Open this publication in new window or tab >>Data Management for Component-Based Embedded Real-Time Systems: the Database Proxy Approach
2012 (English)In: Journal of Systems and Software, ISSN 0164-1212, Vol. 85, no 4, 821-834 p.Article in journal (Refereed) Published
Abstract [en]

We introduce the concept of database proxies intended to mitigate the gap between two disjoint productivity-enhancing techniques: Component Based Software Engineering (CBSE) and Real-Time Database Management Systems (RTDBMS). The two techniques promote opposing design goals and their coexistence is neither obvious nor intuitive. CBSE promotes encapsulation and decoupling of component internals from the component environment, whilst an RTDBMS provide mechanisms for efficient and predictable global data sharing. A component with direct access to an RTDBMS is dependent on that specific RTDBMS and may not be useable in an alternative environment. For components to remain encapsulated and reusable, database proxies decouple components from an underlying database residing in the component framework, while providing temporally predictable access to data maintained in a database. Our approach provide access to features such as extensive data modeling tools, predictable access to hard real-time data, dynamic access to soft real-time data using standardized queries and controlled data sharing; thus allowing developers to employ the full potential of both CBSE and an RTDBMS. Our approach primarily targets embedded systems with a subset of functionality with real-time requirements. The implementation results show that the benefits of using proxies do not come at the expense of significant run-time overheads or less accurate timing predictions.

National Category
Computer and Information Science
Identifiers
urn:nbn:se:mdh:diva-13607 (URN)10.1016/j.jss.2011.10.036 (DOI)000301630700004 ()2-s2.0-84857356711 (Scopus ID)
Available from: 2011-12-15 Created: 2011-12-15 Last updated: 2014-06-16Bibliographically approved
4. Data Management in AUTOSAR: a Tool Suite Extension Approach
Open this publication in new window or tab >>Data Management in AUTOSAR: a Tool Suite Extension Approach
2012 (English)Report (Other academic)
National Category
Computer and Information Science
Research subject
Computer Science
Identifiers
urn:nbn:se:mdh:diva-14510 (URN)
Conference
MRTC report, in submission
Available from: 2012-04-23 Created: 2012-04-23 Last updated: 2013-12-03Bibliographically approved
5. Introducing Database-Centric Support in AUTOSAR
Open this publication in new window or tab >>Introducing Database-Centric Support in AUTOSAR
2012 (English)In: 7th International Symposium on Industrial Embedded Systems (SIES): Conference Proceedings, IEEE , 2012, 138-147 p.Conference paper, (Refereed)
Abstract [en]

We propose to integrate a real-time databasemanagement system into the basic software of the AUTOSARcomponent model. This integration can be performed withoutviolating the fundamental principles of the component-basedapproach of the AUTOSAR standard. Our database-centricapproach allows developers to focus on application developmentinstead of reinventing data management techniques ordevelop solutions using internal data structures. We use stateof-the-art database pointer techniques to achieve predictabletiming, and database proxies to maintain component encapsulationand independence of data-management strategy. Thepaper illustrates the feasibility of our proposal when databaseproxies are used to manage the data communication betweencomponents and to perform run-time monitoring on the virtualfunction bus. Our implementation results show that the abovebenefits do not come at the expense of run-time overheadsor less accurate timing predictions. Under typical workloadconditions, our concept only introduces in the order of 4%CPU overhead.

Place, publisher, year, edition, pages
IEEE, 2012
National Category
Computer and Information Science Engineering and Technology
Research subject
Computer Science
Identifiers
urn:nbn:se:mdh:diva-14509 (URN)10.1109/SIES.2012.6356579 (DOI)2-s2.0-84871544622 (Scopus ID)978-1-4673-2684-1 (ISBN)
Conference
7th IEEE International Symposium on Industrial Embedded Systems, SIES 2012; Karlsruhe; 20 June 2012 through 22 June 2012
Available from: 2012-04-23 Created: 2012-04-23 Last updated: 2013-12-03Bibliographically approved

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