scholarly journals MOSES: A Framework for QoS Driven Runtime Adaptation of Service-Oriented Systems

2012 ◽  
Vol 38 (5) ◽  
pp. 1138-1159 ◽  
Author(s):  
Valeria Cardellini ◽  
Emiliano Casalicchio ◽  
Vincenzo Grassi ◽  
Stefano Iannucci ◽  
Francesco Lo Presti ◽  
...  
Keyword(s):  
Runtime Adaptation ◽  
Service Oriented

Revenue Optimization of Service Compositions using Conditional Request Retries

2013 ◽  
Vol 10 (2) ◽  
pp. 1-22 ◽  
Author(s):  
Miroslav Živković ◽  
Hans van den Berg
Keyword(s):  
Optimal Time ◽  
Adaptation Mechanism ◽  
Revenue Optimization ◽  
Runtime Adaptation ◽  
Qos Parameters ◽  
Service Oriented ◽  
Response Time Distributions ◽  
Service Adaptation ◽  
The Impact ◽  
Concrete Service

Due to the inherent stochastic nature of services execution environment within service oriented systems, a runtime adaptation of the given composition may be required. The authors investigate a runtime service adaptation mechanism based on conditional retries for orchestrated web services. The conditional retry may be issued while a concrete service within composition is executed. The retry could either invoke the same concrete service or a functionally equivalent web service that implements the same task. The authors use dynamic programming to determine the optimal time instances at which the current request should be terminated before request replication. The calculation takes into account different QoS parameters like services' response-time distributions and cost-related parameters, and the solution optimizes the expected revenue of the composite service provider. The authors illustrate the benefits of their approach by numerical calculations, and discuss the impact of considered QoS parameters to the solution at hand.

Social Context as a Service: Managing Adaptation in Collaborative Pervasive Applications

2015 ◽  
Vol 24 (01) ◽  
pp. 1540001 ◽  
Author(s):  
Muhammad Ashad Kabir ◽  
Jun Han ◽  
Alan Colman ◽  
Jian Yu
Keyword(s):  
Social Context ◽  
Social Contexts ◽  
User Requirements ◽  
Runtime Adaptation ◽  
Changing Environments ◽  
Service Oriented ◽  
Execution Environment ◽  
Key Features ◽  
Infrastructure Services ◽  
Pervasive Applications

We present a social context as a service (SCaaS) platform for managing adaptations in collaborative pervasive applications that support interactions among a dynamic group of actors such as users, stakeholders, infrastructure services, businesses and so on. Such interactions are based on predefined agreements and constraints that characterize the relationships between the actors and are modeled with the notion of social context. In complex and changing environments, such interaction relationships, and thus social contexts, are also subject to change. In existing approaches, the relationships among actors are not modeled explicitly, and instead are often hard-coded into the application. Furthermore, these approaches do not provide adequate adaptation support for such relationships as the changes occur in user requirements and environments. In our approach, inter-actor relationships in an application are modeled explicitly using social contexts, and their execution environment is generated and adaptations are managed by the SCaaS platform. The key features of our approach include externalization of the interaction relationships from the applications, representation and modeling of such relationships from the domain and actor perspectives, their implementation using a service oriented paradigm, and support for their runtime adaptation. We quantify the platform's adaptation overhead and demonstrate its feasibility and applicability by developing a telematics application that supports cooperative convoy.

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