Socially Enhanced Services Computing

Modern Models and Algorithms for Distributed Systems

herausgegeben von: Schahram Dustdar, Daniel Schall, Florian Skopik, Lukasz Juszczyk, Harald Psaier

Verlag: Springer Vienna

Enthalten in: Springer Professional "Wirtschaft+Technik" , Springer Professional "Technik" , Springer Professional "Wirtschaft"

Einloggen, um Zugang zu erhalten

Über dieses Buch

Socially enhanced Services Computing deals with a novel and exciting new field at the intersection between Social Computing, Service-oriented Computing, Crowd Computing, and Cloud Computing. The present work presents a collection of selected papers by the editors of this volume, which they feel will help the reader in understanding this field. The approach discussed allows for a seamless integration of people into trusted dynamic compositions of Human-provided Services and Software-based services, thus empowering new interaction models and processes in massive collaboration scenarios in a Future Internet.

Inhaltsverzeichnis

Frontmatter

Chapter 1. The Human-Provided Services Framework

Abstract

The collaboration landscape evolves rapidly by allowing people to participate in ad-hoc and process-centric collaborations. Thus, it is important to support humans in managing highly dynamic and complex interactions. The problem currently with managing interactions is that humans are unable to specify different interaction interfaces for various collaborations, nor able to indicate their availability to participate in collaborations. This work introduces the Human-provided Services (HPS) framework, which allows users to provide services based on their skills and expertise. Such services can be used by human actors and software services in both ad-hoc and process-centric collaborations. With the HPS framework, people can offer multiple services and manage complex interactions, while requesters can find the right experts and available users for performing specific tasks. In this work, we present the HPS middleware, which is the core of the HPS framework. We show how HPS services can be used in Web-scale ad-hoc collaboration scenarios.

Daniel Schall, Hong-Linh Truong, Schahram Dustdar

Chapter 2. Unifying Human and Software Services in Web-Scale Collaborations

Abstract

As collaborative Web-based platforms evolve into service-oriented architectures, they promote composite and user-enriched services. In such platforms, the collaborations typically involve both humans and software services, thus creating highly dynamic and complex interactions. However, todays collaboration tools don’t let humans specify different interaction interfaces (services), which can be reused in various collaborations. Furthermore, humans need more ways to indicate their availability and desire to participate in collaborations. The Human-Provided Services (HPS) framework lets people manage their interactions and seamlessly integrate their capabilities into Web-scale workflows as services. It unifies humans and software services and supports ad hoc and process-centric collaborations.

Daniel Schall, Hong-Linh Truong, Schahram Dustdar

Chapter 3. Modeling and Mining of Dynamic Trust in Complex Service-Oriented Systems

Abstract

The global scale and distribution of companies have changed the economy and dynamics of businesses. Web-based collaborations and cross-organizational processes typically require dynamic and context-based interactions between people and services. However, finding the right partner to work on joint tasks or to solve emerging problems in such scenarios is challenging due to scale and temporary nature of collaborations. Furthermore, actor competencies evolve over time, thus requiring dynamic approaches for their management. Web services and SOA are the ideal technical framework to automate interactions spanning people and services. To support such complex interaction scenarios, we discuss mixed service-oriented systems that are composed of both humans and software services, interacting to perform certain activities. As an example, consider a professional online support community consisting of interactions between human participants and software-based services. We argue that trust between members is essential for successful collaborations. Unlike a security perspective, we focus on the notion of social trust in collaborative networks. We show an interpretative rule-based approach to enable humans and services to establish trust based on interactions and experiences, considering their context and subjective perceptions.

Florian Skopik, Daniel Schall, Schahram Dustdar

Chapter 4. Script-Based Generation of Dynamic Testbeds for SOA

Abstract

This chapter addresses one of the major problems of SOA software development: the lack of support for testing complex service-oriented systems. The research community has developed various means for checking individual Web services but has not come up with satisfactory solutions for testing systems that operate in service-based environments and, therefore, need realistic testbeds for evaluating their quality. We regard this as an unnecessary burden for SOA engineers. As a proposed solution for this issue, we present the Genesis2 testbed generator framework. Genesis2 supports engineers in modeling testbeds and programming their behavior. Out of these models it generates running instances of Web services, clients, registries, and other entities in order to emulate realistic SOA environments. By generating real testbeds, our approach assists engineers in performing runtime tests of their systems and particular focus has been put on the framework’s extensibility to allow the emulation of arbitrarily complex environments. Furthermore, by exploiting the advantages of the Groovy language, Genesis2 provides an intuitive yet powerful scripting interface for testbed control.

Lukasz Juszczyk, Schahram Dustdar

Chapter 5. Behavior Monitoring in Self-Healing Service-Oriented Systems

Abstract

Web services and service-oriented architecture (SOA) have become the de facto standard for designing distributed and loosely coupled applications. Many service-based applications demand for a mix of interactions between humans and Software-Based Services (SBS). An example is a process model comprising SBS and services provided by human actors. Such applications are difficult to manage due to changing interaction patterns, behavior, and faults resulting from varying conditions in the environment. To address these complexities, we introduce a self-healing approach enabling recovery mechanisms to avoid degraded or stalled systems. The presented work extends the notion of self-healing by considering a mixture of human and service interactions observing their behavior patterns. We present the design and architecture of the VieCure framework supporting fundamental principles for autonomic self-healing strategies. We validate our self-healing approach through simulations.

Harald Psaier, Florian Skopik, Daniel Schall, Schahram Dustdar

Chapter 6. Runtime Behavior Monitoring and Self-Adaptation in Service-Oriented Systems

Abstract

Mixed service-oriented systems composed of human actors and software services build up complex interaction networks. Without any coordination, such systems may exhibit undesirable properties due to unexpected behavior. Also, communications and interactions in such networks are not preplanned by top-down composition models. Consequently, the management of service-oriented applications is difficult due to changing interaction and behavior patterns that possibly contradict and result in faults from varying conditions and misbehavior in the network. In this chapter we present a self-adaptation approach that regulates local interactions to maintain desired system functionality. To prevent degraded or stalled systems, adaptations operate by link modification or substitution of actors based on similarity and trust metrics. Unlike a security perspective on trust, we focus on the notion of socially inspired trust. We design an architecture based on two separate independent frameworks. One providing a real Web service testbed extensible for dynamic adaptation actions. The other is our self-adaptation framework including all modules required by systems with self-* properties. In our experiments we study a trust and similarity based adaptation approach by simulating dynamic interactions in the real Web services testbed.

Harald Psaier, Lukasz Juszczyk, Florian Skopik, Daniel Schall, Schahram Dustdar

Backmatter

Titel: Socially Enhanced Services Computing
herausgegeben von: Schahram Dustdar
Daniel Schall
Florian Skopik
Lukasz Juszczyk
Harald Psaier
Verlag: Springer Vienna
Electronic ISBN: 978-3-7091-0813-0
Print ISBN: 978-3-7091-0812-3
DOI: https://doi.org/10.1007/978-3-7091-0813-0

Springer Professional

Über dieses Buch

Inhaltsverzeichnis

Frontmatter

Chapter 1. The Human-Provided Services Framework

Chapter 2. Unifying Human and Software Services in Web-Scale Collaborations

Chapter 3. Modeling and Mining of Dynamic Trust in Complex Service-Oriented Systems

Chapter 4. Script-Based Generation of Dynamic Testbeds for SOA

Chapter 5. Behavior Monitoring in Self-Healing Service-Oriented Systems

Chapter 6. Runtime Behavior Monitoring and Self-Adaptation in Service-Oriented Systems

Backmatter

Premium Partner