@article{MathesStoidnerSchwarzkopfetal., author = {Mathes, Markus and Stoidner, Christoph and Schwarzkopf, Roland and Heinzl, Steffen and D{\"o}rnemann, Tim and Dohmann, Helmut and Freisleben, Bernd}, title = {Time-constrained services: a framework for using real-time web services in industrial automation}, series = {Service Oriented Computing and Applications}, volume = {3}, journal = {Service Oriented Computing and Applications}, publisher = {Springer London}, pages = {239 -- 262}, abstract = {The use of web services in industrial automation, e.g. in fully automated production processes like car manufacturing, promises simplified interaction among the manufacturing devices due to standardized protocols and increased flexibility with respect to process implementation and reengineering. Moreover, the adoption of web services as a seamless communication backbone within the overall industrial enterprise has additional benefits, such as simplified interaction with suppliers and customers (i.e. horizontal integration) and avoidance of a break in the communication paradigm within the enterprise (i.e. vertical integration). The Time-Constrained Services (TiCS) framework is a development and execution environment that empowers automation engineers to develop, deploy, publish, compose, and invoke time-constrained web services. TiCS consists of four functional layers—tool support layer, real-time infrastructural layer, real-time service layer, and hardware layer—which contain several components to meet the demands of a web service based automation infrastructure. This article gives an overview of the TiCS framework. More precisely, the general design considerations and an architectural blueprint of the TiCS framework are presented. Subsequently, selected key components of the TiCS framework are discussed in detail: the SOAP4PLC engine for equipping programmable logic controllers with a web service interface, the SOAP4IPC engine for processing web services in real-time on industrial PCs, the WS-TemporalPolicy language for describing time constraints, and the TiCS Modeler for composing time-constrained web services into a time-constrained BPEL4WS workflow.}, language = {en} } @inproceedings{MathesSchwarzkopfDoernemannetal., author = {Mathes, Markus and Schwarzkopf, Roland and D{\"o}rnemann, Tim and Heinzl, Steffen and Freisleben, Bernd}, title = {Composition of Time-Constrained BPEL4WS Workflows Using the TiCS Modeler}, series = {13th IFAC Symposium on Information Control Problems in Manufacturing}, volume = {42}, booktitle = {13th IFAC Symposium on Information Control Problems in Manufacturing}, number = {4}, publisher = {Elsevier}, doi = {https://doi.org/10.3182/20090603-3-RU-2001.0104}, pages = {888 -- 893}, abstract = {The adoption of service-oriented architectures based on web services in industrial automation promises increased interoperability and exibility. Since the development and deployment of web services requires in-depth programming knowledge, adequate tools to ease the work of automation engineers are required. In particular, the orchestration of existing web services to workflows is a challenging task that is complicated by the fact that manufacturing processes have time constraints, especially real-time constraints. This paper presents the Time-Constrained Services (TiCS) Modeler that supports the assisted orchestration of BPEL4WS workflows with time constraints.}, language = {en} } @inproceedings{StoidnerMathesFreisleben, author = {Stoidner, Christoph and Mathes, Markus and Freisleben, Bernd}, title = {Sequence-Controlled Web Services for Programmable Logic Controllers}, series = {13th IFAC Symposium on Information Control Problems in Manufacturing}, volume = {42}, booktitle = {13th IFAC Symposium on Information Control Problems in Manufacturing}, number = {2}, publisher = {Elsevier}, doi = {https://doi.org/10.3182/20090603-3-RU-2001.0128}, pages = {396 -- 401}, abstract = {The use of service-oriented architectures based on web services in the manufacturing layer of industrial enterprises enables vertical integration and promises increased interoperability. Unfortunately, the differing execution patterns—cyclic execution on programmable logic controllers vs. on-demand execution on industrial PCs—complicate the use of web services in the manufacturing layer. This paper introduces sequence-controlled web services that permit to easily export a control module as a web service. An automation engineer can use familiar IEC 61131-3 programming languages to implement the control application and subsequently can export selected modules as web services.}, language = {en} } @inproceedings{DoernemannMathesSchwarzkopfetal., author = {D{\"o}rnemann, Tim and Mathes, Markus and Schwarzkopf, Roland and Juhnke, Ernst and Freisleben, Bernd}, title = {DAVO: A Domain-Adaptable, Visual BPEL4WS Orchestrator}, series = {Proceedings of the 23rd IEEE International Conference on Advanced Information Networking and Applications}, booktitle = {Proceedings of the 23rd IEEE International Conference on Advanced Information Networking and Applications}, publisher = {IEEE Computer Society Press}, doi = {10.1109/AINA.2009.78}, pages = {121 -- 128}, abstract = {The Business Process Execution Language for Web Services (BPEL4WS) is the de facto standard for the composition of web services into complex, valued-added workflows in both industry and academia. Since the composition of web services into a workflow is challenging and error-prone, several graphical BPEL4WS workflow editors have been developed. These tools focus on the composition process and the visualization of workflows and mainly address the needs of web service experts.To increase the acceptance of BPEL4WS in new application domains, it is mandatory that non web service experts are also empowered to easily compose web services into a workflow. This paper presents the Domain-Adaptable Visual Orchestrator (DAVO), a graphical BPEL4WS workflow editor which offers a domain-adaptable data model and user interface. DAVO can be easily customized to domain needs and thus is suitable for non web service experts.}, language = {en} } @inproceedings{HeinzlMathesStadelmannetal., author = {Heinzl, Steffen and Mathes, Markus and Stadelmann, Thilo and Seiler, Dominik and Diegelmann, Marcel and Dohmann, Helmut and Freisleben, Bernd}, title = {The Web Service Browser: Automatic Client Generation and Efficient Data Transfer for Web Services}, series = {Proceedings of the 7th IEEE International Conference on Web Services}, booktitle = {Proceedings of the 7th IEEE International Conference on Web Services}, publisher = {IEEE Computer Society Press}, doi = {10.1109/ICWS.2009.22}, pages = {743 -- 750}, abstract = {Web services are supported by almost all major software vendors, but nevertheless there is still a certain barrier that prevents a broader user community to actually use them. The barrier is the lack of appropriate clients offered in conjunction with the services. This paper presents a Web Service Browser that automatically generates a dynamic user interface when the user browses to the location of the service description and additionally handles the invocation of the service. To ease the use of the service, the browser takes care of data management by using an implementation of the Flex-SwA architecture. Results are presented to the user in a human-readable manner. When the result contains multimedia data, an audio or video player is used to present the result. Use cases demonstrate the benefits of the browser. With the Web Service Browser, web services simply become a usable component offered in the WWW.}, language = {en} } @inproceedings{MathesStoidnerHeinzletal., author = {Mathes, Markus and Stoidner, Christoph and Heinzl, Steffen and Freisleben, Bernd}, title = {SOAP4PLC: Web Services for Programmable Logic Controllers}, series = {17th Euromicro International Conference on Parallel, Distributed, and Network-Based Processing}, booktitle = {17th Euromicro International Conference on Parallel, Distributed, and Network-Based Processing}, publisher = {IEEE Computer Society Press}, doi = {https://doi.org/10.1109/PDP.2009.42}, pages = {210 -- 219}, abstract = {The use of service-oriented architectures based on web services in the manufacturing layer of industrial enterprises yields vertical integration and promises increased interoperability and flexibility. Unfortunately, two main obstacles complicate the use of web services in the manufacturing layer. First, the hardware/software used in this layer differs from the hardware/software used in other layers. Second, the manufacturing layer is maintained by automation engineers who typically are not familiar with web services. This paper presents the first SOAP engine for programmable logic controllers to advance the use of web services in the manufacturing layer. The engine offers a low memory footprint to respect the low computational power of programmable logic controllers and allows to export web services automatically without intervention of an automation engineer.}, language = {en} } @inproceedings{MathesGaertnerDohmannetal., author = {Mathes, Markus and G{\"a}rtner, Jochen and Dohmann, Helmut and Freisleben, Bernd}, title = {SOAP4IPC: A Real-Time SOAP Engine for Industrial Automation}, series = {17th Euromicro International Conference on Parallel, Distributed, and Network-Based Processing}, booktitle = {17th Euromicro International Conference on Parallel, Distributed, and Network-Based Processing}, publisher = {IEEE Computer Society Press}, doi = {https://doi.org/10.1109/PDP.2009.21}, pages = {220 -- 226}, abstract = {The adoption of service-oriented architectures based on web services in industrial automation promises increased interoperability and flexibility. However, industrial automation requires real-time processing, i.e. a task has to be processed within a specific deadline, which is a large obstacle for utilizing web services in this domain.The Time-Constrained Services (TiCS) framework meets the demands of industrial automation and empowers automation engineers to develop, deploy, publish, compose, and invoke time-constrained web services. This paper presents the TiCS real-time SOAP engine for industrial PCs called SOAP4IPC. It permits the execution of web services in real-time. The architecture of the SOAP4IPC engine, implementation details, and experimental results are discussed.}, language = {en} } @article{MathesHeinzlSchwarzkopfetal., author = {Mathes, Markus and Heinzl, Steffen and Schwarzkopf, Roland and Freisleben, Bernd}, title = {F\&L-Grid: Eine generische Backup und Recovery Infrastruktur f{\"u}r das D-Grid}, series = {2. DFN-Forum Kommunikationstechnologien}, journal = {2. DFN-Forum Kommunikationstechnologien}, editor = {M{\"u}ller, P. and Neumair, B. and Rodosek, G. D.}, publisher = {Gesellschaft f{\"u}r Informatik e.V.}, address = {Bonn}, pages = {55 -- 67}, abstract = {Grid Computing wird oftmals zur Durchf{\"u}hrung zeitintensiver Experimente, die eine enorme Menge an Daten produzieren, verwendet. Da existierende Backup und Recovery L{\"o}sungen basierend auf GridFTP oder RFT detaillierte technische Kenntnisse bez{\"u}glich Konfiguration und Nutzung erfordern, sind diese nicht unbedingt f{\"u}r alle Anwender geeignet. Viele Wissenschaftler bevorzugen eine m{\"o}glichst einfache und bedienungsfreundliche L{\"o}sung, um ihre experimentellen Ergebnisse zu sichern. Das F\&L-Grid Projekt, welches die Entwicklung eines Grids f{\"u}r Forschung und Lehre beabsichtigt, ist ein Teil des D-Grid. Hauptziel von F\&L-Grid ist der Entwurf und die Entwicklung einer generischen Backup und Recovery Infrastruktur f{\"u}r beliebige Grid-Umgebungen. Dieser Beitrag diskutiert den aktuellen Projektstatus von F\&LGrid und skizziert den Entwurf und die Implementierung der generischen Backup und Recovery Infrastruktur.}, language = {de} } @inproceedings{MathesHeinzlFreisleben, author = {Mathes, Markus and Heinzl, Steffen and Freisleben, Bernd}, title = {Towards a Generic Backup and Recovery Infrastructure for the German D-Grid Initiative}, series = {Tagungsband der ITG/GI-Fachtagung Kommunikation in Verteilten Systemen (KiVS)}, booktitle = {Tagungsband der ITG/GI-Fachtagung Kommunikation in Verteilten Systemen (KiVS)}, publisher = {Springer}, pages = {229 -- 240}, abstract = {Grid computing is often used for conducting time-consuming experiments that produce large amounts of data. Since existing backup and recovery solutions based on GridFTP or RFT require in-depth knowledge, they are not suited for scientists who are not Grid computing experts. Most scientists prefer an easy to use solution to back up and recover their experimental results. The F\&L-Grid project (a Grid providing services for research and education) is part of the German Grid Initiative (D-Grid) and is aimed at the design and development of the first generic backup and recovery infrastructure suitable for arbitrary Grid environments. This paper presents the current status of the ongoing F\&L-Grid project and outlines the generic backup and recovery infrastructure in detail.}, language = {en} } @inproceedings{HeinzlMathesFreisleben, author = {Heinzl, Steffen and Mathes, Markus and Freisleben, Bernd}, title = {The Grid Browser: Improving Usability in Service-Oriented Grids by Automatically Generating Clients and Handling Data Transfers}, series = {Proceedings of the 4th IEEE International Conference on e-Sciencee}, booktitle = {Proceedings of the 4th IEEE International Conference on e-Sciencee}, publisher = {IEEE Computer Society Press}, doi = {10.1109/eScience.2008.19}, pages = {269 -- 276}, abstract = {This paper presents a grid browser as a familiar environment for accessing a service-oriented grid. To relieve the service developer from developing a graphical user interface and a grid service client, and to relieve the service provider from installing and maintaining a grid portal, the proposed grid browser can be used instead of a grid portal. A grid browser is a Web browser that renders WSDL files similar to HTML files. Surfing to the location of the WSDL description of a grid service results in the automatic generation of a graphical frontend in the grid browser which a user can easily fill out to invoke a service or submit a job. Furthermore, data transfers are integrated into the grid browser by integrating an implementation of the Flex-SwA architecture, such that data transmission and service invocation can be done efficiently in a single step. An implementation of the proposed grid browser to improve the usability of a service-oriented grid is presented. A use case points out the advantages of the grid browser.}, language = {en} }