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A component-based approach for embedded software development 5

A component-based approach for embedded software development

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5th ieee international symposium on object-oriented real-time distributed computing (ISORC 2002)

作者： Yen, IL Goluguri, J Bastani, F Khan, L Linn, J Univ Texas Dallas Dallas TX 75230 USA

ISBN: (纸本)0769515584

The rapid growth in the demand of embedded systems and the increased complexity of embedded software pose an urgent need for advanced embedded software development techniques. Software technology is shifting toward semi-automated code generation and integration of systems from components. component-based development (CBD) techniques can significantly reduce the time and cost for developing software systems. However, there are some difficult problems with the CBD approach. component identification and retrieval as well as component composition require extensive knowledge of the components. Designers need to go through a steep learning curve in order to effectively compose a system out of available components. In this paper, we discuss an integrated mechanism for component-based development of embedded software. We develop an On-line Repository for Embedded Software (ORES) to facilitate component management and retrieval. ORES uses an ontology-based approach to facilitate repository browsing and effective search. Based on ORES, we develop the code template approach to facilitate semi-automated component composition. A code template can be instantiated by different sets of components and, thus, offers more flexibility and configurability and better reuse. Another important aspect in embedded software is the nonfunctional requirements and properties. In ORES, we capture nonfunctional properties of components and provide facilities for the analysis of overall system properties.

关键词： Application software Artificial satellites Costs Embedded software Embedded system Instruments Ontologies Ores Software development management Software systems

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A component model for hard real-time systems: CCM with ARINC-653

A component model for hard real-time systems: CCM with ARINC...

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13th ieee international symposium on object/component/service-oriented real-time distributed computing (ISORC)

作者： Dubey, Abhishek Karsai, Gabor Mahadevan, Nagabhushan Vanderbilt Univ Inst Software Integrated Syst Nashville TN 37212 USA

The size and complexity of software in safety-critical systems is increasing at a rapid pace. One technology that can be used to mitigate this complexity is component-based software development. However, in spite of the apparent benefits of a component-based approach to development, little work has been done in applying these concepts to hard real-time systems. This paper improves the state of the art by making three contributions: (1) we present a component model for hard real-time systems and define the semantics of different types of component interactions;(2) we present an implementation of a middleware that supports this component model. This middleware combines an open-source CORBA component Model (CCM) implementation (MICO) with ARINC-653: a state-of-the-art real-time operating systems (RTOS) standard, (3) finally;we describe a modeling environment that enables design, analysis, and deployment of component assemblies. We conclude with a discussion of the lessons learned during this exercise. Our experiences point toward extending both the CCM as well as revising the ARINC-653. Copyright (C) 2011 John Wiley & Sons, Ltd.

关键词： ARINC-653 real-time component model hard-real time systems

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A fault-tolerant transactional agent model on distributed objects

A fault-tolerant transactional agent model on distributed ob...

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9th ieee international symposium on object and component-oriented real-time distributed computing

作者： Tanaka, Youhei Hayashibara, Naohiro Enokido, Tornoya Takizawa, Makoto Tokyo Denki Univ Tokyo 101 Japan Rissho Univ Tokyo Japan

ISBN: (纸本)076952561X

A transactional agent is a mobile agent to manipulate objects distributed on computers with some type of commitment condition. For example, a transactional agent commits only if at least one object could be successfully manipulated in the at-least-one commitment condition. Computers may stop by fault while networks are assumed to be reliable. In the client-server model, servers can be fault-tolerant according to traditional replication and checkpointing technologies. However, an application program cannot be performed if a client computer is faulty An application program can be performed on another operational computer even if a computer is faulty in the transactional agent model. For example, a transactional agent can move to another operational computer if some destination computer where the agent to move is faulty There are kinds of faulty computers for a transactional agent, current, destination, and sibling computers where a transactional agent now exist, will move, and has visited, respectively. We discuss how the transactinal agent can be tolerant of the types of faults. We show how a program reliably manipulating objects can be realized in a mobile agent in presence of computer faults.

关键词： Fault tolerant computer systems

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On the limits of the precise specification of component interfaces

On the limits of the precise specification of component inte...

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9th ieee international Workshop on object-oriented real-time Dependable Systems

作者： Kopetz, H Suri, N TU Vienna Dept CS Real Time Syst Grp Vienna Austria

ISBN: (纸本)0769520545

When trying to find solutions in a problem domain it is a rational step to first explore the limits of the design space. If, during such an endeavor, an impossibility result is encountered, then the further search space can be selectively seeped for solutions to avoid dead-end avenues. With such a perspective, it is the objective of this contribution to outline and discuss the limits of the precise specification of component interfaces in component-based computing systems. Our interest lies in ascertaining limits covers issues of functional composition and verification. Equally importantly, we provide a rationale behind the causes of the limits and impossibility conditions. We define a component as a self-contained subsystem, including software and hardware that provides a specified service across identified interfaces to its users. Without loss of any generality, we assume that all interfaces are message based [1]. According to [2] it is reasonable to distinguish between the following interface types of a component: The service providing linking interfaces (SPLIF, or LIF for short): this interface provides the services of the components to its users. According to Parnas [3] p.330: The specification must provide to the intended user all the information that he will need to use the program (component) correctly and nothing more. For example, a simple smart transducer component for temperature monitoring delivers at its LIF periodically a message containing the measured temperature and nothing more. The service requesting linking interfaces (SRLIF): This interface is used by the component under consideration to request services from other components or the environment in order to accomplish the stated mission at the components LIF. In order to support the principle of information hiding[3], a user of the LIF should not be aware of the existence of the SRLIF. In our example, the analog voltage of the physical temperature sensor is delivered to the component across a SR

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A timing assumption and a t-resilient protocol for implementing an eventual leader service in asynchronous shared memory systems

A timing assumption and a <i>t</i>-resilient protocol for im...

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10th ieee international symposium on object and component-oriented real-time distributed computing

作者： Fernandez, Antonio Jimenez, Ernesto Raynal, Michel Tredan, Gilles Univ Rennes IRISA Campus de Beaulieu F-35042 Rennes France Univ Rey Juan Carlos LADyR GSyC Mostoles 28933 Spain Univ Politecn Madrid EUI Madrid 28031 Spain

ISBN: (纸本)9780769527659

While electing an eventual common leader despite process crashes, in a shared memory system where the processes communicate only by reading and writing shared registers is possible when the processes progress synchronously, this problem becomes impossible to solve as soon as the processes can progress in a fully asynchronous way. So, an important problem consists in finding additional behavioral assumptions that are, at the same time "as weak as possible" (in order they are practically always satisfied), and "strong enough" in order to allow implementing an eventual leader service despite the net effect of asynchrony and failures. This paper focuses on this dilemma. Afore explicitly, it investigates a timing assumption that allows implementing an eventual leader in presence of partial asynchrony and process crashes. The proposed timing assumptions are particularly weak. They are the following: after some time (i) there is a process that behaves synchronously, and (ii) (t - f) other processes have timers that work correctly (t is the maximal number of processes that may crash, and f the actual number of process crashes;a tinier works incorrectly when it expires too early with respect to the value it has been set). Then, the paper proposes a t-resilient protocol that elects an eventual common leader in any shared memory system that satisfies the previous assumption. Interestingly, this protocol is based on simple design principles.

关键词： asynchronous system atomic register eventual leader fault-tolerance omega process crash shared memory system model timer property timing assumptions

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RTM-TECS: Collaboration Framework for Robot Technology Middleware and Embedded component System 19

RTM-TECS: Collaboration Framework for Robot Technology Middl...

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19th ieee international symposium on real-time distributed computing (ISORC)

作者： Hasegawa, Ryo Yawata, Naofumi Ando, Noriaki Nishio, Nobuhiko Azumi, Takuya Osaka Univ Grad Sch Engn Sci Suita Osaka 565 Japan Ritsumeikan Univ Grad Sch Informat Sci & Engn Kyoto Japan Natl Inst Ind Sci & Technol AIST Tokyo Japan

ISBN: (纸本)9781467390323

Robot technologies, such as robot technology middleware (RTM) that is a component-oriented platform, are popular. However, RTM does not ensure stable real-time processing in common object request broker architecture. In this paper, a collaboration framework of RTM and TOPPERS embedded component system (TECS) is proposed to address this problem. TECS, a system that satisfies real-time processing requirements, is employed to enhance real-time processing in the proposed framework. To implement the collaboration of RTM and TECS, we have adopted remote procedure call and one-way communication. In addition, extending a generator enables the generation of robot technology components from TECS components. We have evaluated the processor cycle counts of the proposed framework in comparison with those of a conventional method. In addition, we evaluated the execution time of serial communication and a motor application using the proposed framework. The evaluation results show that the proposed framework is functionally employed in a hard real-time system. Furthermore, we evaluated the amount of code generated by the proposed framework. The evaluation results reveal that the code generated by the proposed framework is reusable and can enhance productivity.

关键词： Middleware

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Handling QoS in a dynamic real-time environment

Handling QoS in a dynamic real-time environment

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8th ieee international Workshop on object-oriented real-time Dependable Systems (WORDS 2003)

作者： Almeida, C Univ Tecn Lisboa Inst Super Tecn DEEC P-1049001 Lisbon Portugal

ISBN: (纸本)0769519296

In the new emerging communications infrastructures there is the desire and the demand to build applications with every increasing requirements in what concerns real-time and dependability. However the dynamic characteristics of those environments make it difficult, if even possible, to always offer the desired quality-of-service (QoS). It is thus important to have some support to handle QoS in such scenarios. In this paper based on the quasi-synchronous approach, we propose a set of group communication protocols with different QoS properties (timeliness, order agreement), that are built in a component based fashion. Depending on the characteristics of the environment, applications may choose the best QoS that is still possible to have at a give moment.

关键词： Quality of service

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Analysis of guaranteed service times of distributed real-time objects 3

Analysis of guaranteed service times of distributed real-tim...

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3rd ieee international symposium on object-oriented real-time distributed computing, ISORC 2000

作者： Kim, K.H. University of California IrvineCA92697 United States

ISBN: (纸本)0769506070

As the demands for real time distributed systems increase, the need for programming tools useful in development of such application systems is becoming increasingly acute. An issue that the research community has long recognized as an important technological challenge but has not shown much progress in meeting the challenge is to guarantee response times of real time distributed systems. Two basic problems must be solved to effectively meet this challenge: (1) to establish the distributed real time program structure and the system infrastructure structure, i.e., the structure of the operating system (OS) and the communication infrastructure, that enable systematic analysis of the worst case time behavior of the application systems;and (2) to establish a tool which performs automated analysis of the worst case time behavior while leaving only minimal work to the designers. The problem area (1) has been recognized as a research area for a long time, but only in recent years has the skeleton of a usable technical foundation started emerging. In other words, there has long been a lack of fully general and yet easily analyzable distributed real time program structures and also a lack of useful OS timing models. However, on the basis of the skeleton emerged, rapid progress is expected in the future toward establishment of a full technical foundation. Therefore, the time seems ripe for launching new larger scale attacks on problem (2) on the basis of those recent developments in handling problem (1). © 2000 ieee.

关键词： Application programs

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Integrating QoS to collaborative distributed virtual reality applications 3

Integrating QoS to collaborative distributed virtual reality...

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3rd ieee international symposium on object-oriented real-time distributed computing, ISORC 2000

作者： Choukair, Z. Retailleau, D. ENST Bretagne Département Informatique Technopôle de l'Iroise Brest cedex29285 France

ISBN: (纸本)0769506070

Today's virtual environments are expected to be distributed to allow collaboration for common purposes. However, they must ensure a high level of quality of service (QoS) to the user, especially in an open context with unknown, a priori, man-in-the-loop event occurrence. This paper presents our distributed Virtual Environment COllaboration Model (DVECOM) and its implementation which aims to provide an end-user QoS support for distributed virtual reality applications. The idea of DVECOM is to guarantee full consistency and soft synchronization of the virtual world distributed displays, with the least rendering degradation possible, and also to auto-adapt the rendering in accordance with the retained strategy, ensuring best effort and least suffering for virtual world rendering. This representation degradation is driven by the users' choices. The receiver-side protocol is based upon the end-user preferences, physical level capability information, as well as the pertinence of the notification to each client (contextual end-user information). When available, such guarantees would make it possible to use DVE out of a closed, oversized, very restricted context for industrial collaborative applications with an expected QoS. © 2000 ieee.

关键词： Quality of service

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Predictable Efficiency for Reconfiguration of service-oriented Systems with Concerto 20

Predictable Efficiency for Reconfiguration of Service-Orient...

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20th ieee/ACM international symposium on Cluster, Cloud and Internet computing (CCGrid)

作者： Chardet, Maverick Coullon, Helene Perez, Christian UBL IMT Atlantique LS2N INRIA F-44307 Nantes France Univ Lyon INRIA CNRS ENS LyonUCBLLIP F-69342 Lyon 07 France

ISBN: (纸本)9781728160955

Dynamic reconfiguration of distributed software systems is nowadays gaining interest because of the emergence of dynamic IoT and smart applications as well as large scale dynamic infrastructures (e.g., Fog and Edge computing). When quality of service and experience is of prime importance, efficient reconfiguration is necessary, as well as performance predictability to decide when a reconfiguration should occur. This paper tackles the problem of efficient execution of a reconfiguration plan and its predictability with Concerto, a reconfiguration model supporting a high level of parallelism. Evaluation performed on synthetic cases and on two real production scenarios show that Concerto provides better performance than state-of-the-art systems with accurate time estimation.

关键词： distributed systems reconfiguration component model performance

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