Search results for: Guido Wirtz

Items from 1 to 20 out of 35 results

article

Troubleshooting Serverless functions: a combined monitoring and debugging approach

Johannes Manner, Stefan Kolb, Guido Wirtz

SICS Software-Intensive Cyber-Physical Systems > 2019 > 34 > 2-3 > 99-104

Today, Serverless computing gathers pace and attention in the cloud computing area. The abstraction of operational tasks combined with the auto-scaling property are convincing reasons to adapt this new cloud paradigm. Building applications in a Serverless style via cloud functions is challenging due to the fine-grained architecture and the tighter coupling to back end services. Increased complexity,...

article

The 11th advanced summer school on service-oriented computing

Guido Wirtz

Computer Science - Research and Development > 2018 > 33 > 3-4 > 279-279

article

BPMN 2.0: The state of support and implementation

Matthias Geiger, Simon Harrer, Jörg Lenhard, Guido Wirtz

Future Generation Computer Systems > 2018 > 80 > C > 250-262

The Business Process Model and Notation 2.0 (BPMN) standard has been hailed as a major step in business process modeling and automation. Recently, it has also been accepted as an ISO standard. The expectation is that vendors of business process management systems (BPMS) will switch to the new standard and natively support its execution in process engines.This paper presents an analysis of the current...

chapter

Data Governance and Semantic Recommendation Algorithms for Cloud Platform Selection

Stefan Kolb, Guido Wirtz

2017 IEEE 10th International Conference on Cloud Computing (CLOUD) > 664 - 671

2017 IEEE 10th International Conference on Cloud Computing (CLOUD)

Platform as a Service is the major productivity enabler in the cloud computing stack. By providing managed and highly automated application environments, it enhances developer productivity and reduces developer operations and maintenance efforts. The market, however, is fast-changing and offerings are differing conceptually as well as in their supported technological ecosystem. Therefore, provider...

chapter

Implementing ReGreT in a Decentralized Multi-agent Environment

Stefan König, Sven Kaffille, Guido Wirtz

Lecture Notes in Computer Science > Multiagent System Technologies > Trust and Reputation > 194-205

Since the last decade reputation management has been examined as a possible foundation for trust establishment and trust dissemination in distributed artificial intelligence. While the systems are distributed the reputation management systems are in most cases centralized. This paper describes the implementation of the ReGreT approach to trust and reputation management in Multi-Agent Systems in a...

chapter

Performance Measurements of Tor Hidden Services in Low-Bandwidth Access Networks

Jörg Lenhard, Karsten Loesing, Guido Wirtz

Lecture Notes in Computer Science > Applied Cryptography and Network Security > Authentication and Anonymity > 324-341

Being able to access and provide Internet services anonymously is an important mechanism to ensure freedom of speech in vast parts of the world. Offering location-hidden services on the Internet requires complex redirection protocols to obscure the locations and identities of communication partners. The anonymity system Tor supports such a protocol for providing and accessing TCP-based services anonymously...

article

Portability of executable service-oriented processes: metrics and validation

Jörg Lenhard, Guido Wirtz

Service Oriented Computing and Applications > 2016 > 10 > 4 > 391-411

A key promise of process languages based on open standards, such as the Web Services Business Process Execution Language, is the avoidance of vendor lock-in through the portability of processes among runtime environments. Despite the fact that today various runtimes claim to support this language, every runtime implements a different subset, thus hampering portability and locking in their users. It...

chapter

Edit Distance-Based Pattern Support Assessment of Orchestration Languages

Jörg Lenhard, Andreas Schönberger, Guido Wirtz

Lecture Notes in Computer Science > On the Move to Meaningful Internet Systems: OTM 2011 > Service Orchestration and Workflows > 137-154

Orchestration languages are of paramount importance when implementing business processes based on services. Several languages for specifying Web Services-based orchestrations are available today. Examples are the Web Services Business Process Execution Language or Windows Workflow. Patterns for process-aware information systems have frequently been used to assess such languages. Various studies discuss...

chapter

Closing the Gap between Object-Oriented Modeling of Structure and Behavior

Holger Giese, Jörg Graf, Guido Wirtz

Lecture Notes in Computer Science > «UML»’99 — The Unified Modeling Language > Precise Behavioral Modeling > 534-549

The UML as standardized language for visual object-oriented modeling allows to capture the requirements as well as the structure and behavior of complex software systems. With the increasing demands of todays systems, behavior aspects like concurrency, distribution and reactivity become more important. But the language concepts of the UML for describing behavioral aspects are weak compared to its...

chapter

Extending UML with Workflow Modeling Capabilities

Guido Wirtz, Mathias Weske, Holger Giese

Lecture Notes in Computer Science > Cooperative Information Systems > Workflow Modeling > 30-41

Nowadays application systems are modeled in object-oriented design languages like the Unified Modeling Language (UML). Although workflow management has to deal with such environments, typically propriatory modeling languages are used. We try to remedy the use of seperate languages by proposing an extension of the UML to allow workflow modeling, thereby providing a seamless integration of workflow...

chapter

Describing Services for Service Ecosystems

Gregor Scheithauer, Stefan Augustin, Guido Wirtz

Lecture Notes in Computer Science > Service-Oriented Computing – ICSOC 2008 Workshops > Enabling Service Business Ecosystems (ESBE 2008) > 242-255

Service ecosystems are electronic market places and emerge as a result of the shift toward service economies. The aim of service ecosystems is to trade services over the internet. There are still obstacles that impede this new form of market places. Two of these challenges are addressed in this paper: (1) identification of appropriate service properties to specify service descriptions, and (2) a need...

chapter

Service-Oriented Multi-tenancy (SO-MT): Enabling Multi-tenancy for Existing Service Composition Engines with Docker

Gabriel Nikol, Michael Trager, Simon Harrer, Guido Wirtz

2016 IEEE Symposium on Service-Oriented System Engineering (SOSE) > 238 - 243

2016 IEEE Symposium on Service-Oriented System Engineering (SOSE)

In Web Services-based SOAs, BPEL 2.0 is the choice for defining services by composing existing ones. BPEL-based services can be directly executed on BPEL engines. With the rise of the cloud, companies aim to outsource service hosting to cloud providers. To achieve economies of scale, a cloud provider must host such services with minimal resources and keep the services from different tenants isolated...

chapter

On the Evolution of BPMN 2.0 Support and Implementation

Matthias Geiger, Simon Harrer, Jorg Lenhard, Guido Wirtz

2016 IEEE Symposium on Service-Oriented System Engineering (SOSE) > 101 - 110

2016 IEEE Symposium on Service-Oriented System Engineering (SOSE)

chapter

Engineering Autonomous Trust-Management Requirements for Software Agents: Requirements and Concepts

Sven Kaffille, Guido Wirtz

Innovations and Advances in Computer Sciences and Engineering > 483-489

Due to the need for open and distributed computer systems the demand for trust and autonomous trust management by software agents has become an important topic. This led to the development of different frameworks to support trust management by autonomous software agents. These frameworks enable software agents to autonomously form trust, make trust decisions, and update trust, but are often limited...

chapter

Application Migration Effort in the Cloud - The Case of Cloud Platforms

Stefan Kolb, Jorg Lenhard, Guido Wirtz

2015 IEEE 8th International Conference on Cloud Computing > 41 - 48

2015 IEEE 8th International Conference on Cloud Computing (CLOUD)

Over the last years, the utilization of cloud resources has been steadily rising and an increasing number of enterprises are moving applications to the cloud. A leading trend is the adoption of Platform as a Service to support rapid application deployment. By providing a managed environment, cloud platforms take away a lot of complex configuration effort required to build scalable applications. However,...

chapter

BPMN Conformance in Open Source Engines

Matthias Geiger, Simon Harrer, Jorg Lenhard, Mathias Casar, more

2015 IEEE Symposium on Service-Oriented System Engineering > 21 - 30

2015 IEEE Symposium on Service-Oriented System Engineering (SOSE)

Service-oriented systems are increasingly implemented in a process-based fashion. Multiple languages for building process-based systems are available today, but the Business Process Model and Notation (BPMN) is becoming ubiquitous. With BPMN 2.0 released in 2011, execution semantics were introduced, supporting the definition of executable processes. Nowadays, more and more process engines directly...

chapter

On the Measurement of Design-Time Adaptability for Process-Based Systems

Jorg Lenhard, Matthias Geiger, Guido Wirtz

2015 IEEE Symposium on Service-Oriented System Engineering > 1 - 10

2015 IEEE Symposium on Service-Oriented System Engineering (SOSE)

Today, process languages are frequently used for implementing service-oriented systems and a variety of specifications for this task exist. These specifications strive for the portability of processes among different runtime environments, i.e., process engines. However, direct portability, especially of executable processes, is seldom achieved. If processes cannot be ported directly among engines,...

chapter

Improving the Static Analysis Conformance of BPEL Engines with BPELlint

Simon Harrer, Matthias Geiger, Christian R. Preissinger, David Bimamisa, more

2015 IEEE Symposium on Service-Oriented System Engineering > 31 - 39

2015 IEEE Symposium on Service-Oriented System Engineering (SOSE)

Today, process-aware systems are ubiquitous. They are built by leveraging process languages for both business and implementation perspectives. In the typical context of a Web Services-based Service-oriented Architecture, the obvious choice to implement service orchestrations is still the Business Process Execution Language (BPEL). For BPEL, a variety of open source and commercial engines have emerged...

chapter

BPEL Conformance in Open Source Engines: The Case of Static Analysis

Simon Harrer, Christian Preissinger, Guido Wirtz

2014 IEEE 7th International Conference on Service-Oriented Computing and Applications > 33 - 40

2014 IEEE 7th International Conference on Service-Oriented Computing and Applications (SOCA)

In 2007, OASIS finalized their Business Process Execution Language 2.0 (BPEL) specification which defines an XML-based language for building orchestrations of Web Services. As the validation of BPEL processes against the official BPEL XML schema leaves room for a plethora of static errors, the specification contains 94 static analysis rules to cover all static errors. According to the specification,...

chapter

Towards a Robustness Evaluation Framework for BPEL Engines

Simon Harrer, Guido Wirtz, Faris Nizamic, Alexander Lazovik

2014 IEEE 7th International Conference on Service-Oriented Computing and Applications > 199 - 206

2014 IEEE 7th International Conference on Service-Oriented Computing and Applications (SOCA)

The selection of the best fitting process engine for a specific project requires the evaluation of engines according to various requirements. We focus on the non-functional requirement robustness, which is critical in production environments but hard to determine. Thus, we propose an evaluation framework to reveal important robustness criteria of process engines. In this work, we focus on message...

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INFONA - science communication portal

Search results for: Guido Wirtz

Troubleshooting Serverless functions: a combined monitoring and debugging approach

The 11th advanced summer school on service-oriented computing

BPMN 2.0: The state of support and implementation

Data Governance and Semantic Recommendation Algorithms for Cloud Platform Selection

Implementing ReGreT in a Decentralized Multi-agent Environment

Performance Measurements of Tor Hidden Services in Low-Bandwidth Access Networks

Portability of executable service-oriented processes: metrics and validation

Edit Distance-Based Pattern Support Assessment of Orchestration Languages

Closing the Gap between Object-Oriented Modeling of Structure and Behavior

Extending UML with Workflow Modeling Capabilities

Describing Services for Service Ecosystems

Service-Oriented Multi-tenancy (SO-MT): Enabling Multi-tenancy for Existing Service Composition Engines with Docker

On the Evolution of BPMN 2.0 Support and Implementation

Engineering Autonomous Trust-Management Requirements for Software Agents: Requirements and Concepts

Application Migration Effort in the Cloud - The Case of Cloud Platforms

BPMN Conformance in Open Source Engines

On the Measurement of Design-Time Adaptability for Process-Based Systems

Improving the Static Analysis Conformance of BPEL Engines with BPELlint

BPEL Conformance in Open Source Engines: The Case of Static Analysis

Towards a Robustness Evaluation Framework for BPEL Engines

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