Microsoft has promoted ASP.NET’s new web services more than almost any other part of the.NET Framework. But despite their efforts, confusion is still widespread about what a web service is and, more importantly, what it’s meant to accomplish. This chapter introduces web services and explains their role in Microsoft’s vision of the programmable web. Along the way, you’ll learn about the open standards plumbing that allows web services to work and removes some of the confusion surrounding technical terms like WSDL (Web Service Description Language), SOAP, and UDDI (universal description, discovery, and integration).

Web Services Architecture

From time to time books emerge which become part of APL's folklore; the obvious example being \"APL-An Interactive Approach\" by Gilman and Roses. Some are more recent and more tangentical in their relevance; exam-pies are Myers \"Refiable Software Through Composite Design\" and Tufte's \"Visualization of Quantitative Data\". I believe that this most recent book of Mr. Gilb's may be destined to become part of this select group. A long-standing belief in the APL world is, that we can deliver \"productivity\"-recent explorations of topics like Function Point Analysis are (belatedly) showing good quality evidence to back this belief. At heart I feel that Mr. Gilb is saying that even though we're moving in the fight direction we're still a very long way from the goal we ought to be shooting for-but that we can achieve the ultimate objective if we take a wider view of the world. Point one-the term 'software engineering' is being hijacked and is in imminent danger of becoming the vogue term for a much smaller range of topics than it purports to cover. Point two-APL applications have long tended to solve broader and more strategic problems than the more established languages. For all of his 442 pages, Mr. Gilb's messages axe brief, relevant and, I believe, achievable. They also embody common sense-that rarest of commodities-it is hard to believe that so many people can have been neglecting the principles for so long. I'd like to summarise his message in three ways. [1] Measure what you're being asked to do in terms meaningful to the business, user or application. And measure what you achieve. [2] Deliver your solution in many incremental stages-at all times delivering the highest value at least cost in the shortest time (remember, you just quantified all of this). [3] Early detection and solution of problems costs orders of magnitude less to fix than late detection and remedy. Think about it-its not novel is it? And doesn't the seemed message have a familiar ring7 What Mr. Glib is attempting to do is to bring rigour into the process. I think that if we were to adopt these methods in a similarly serious-minded vein we might easily discover a lot about ourselves and just possibly find a new way of getting our message into wider environments. I offer a challenge to the APL COmmunity in general and the APL90 organisers in particular. Lets find at least …

Principles of software engineering management

http://www.isa.us.es/sites/default/files/I1A4-Capilla14-JSS.pdf

An overview of Dynamic Software Product Line architectures and techniques: Observations from research and industry

Web Scale Computing: The Power of Infrastructure as a Service.- Services in the Long Tail World: Challenges and Opportunities.- Services for Science.- Managing and Internet Service Bus.- Quality-Driven Business Policy Specification and Refinement for Service-Oriented Systems.- Adaptation of Web Service Composition Based on Workflow Patterns.- Protocol-Based Web Service Composition.- Design and Implementation of a Fault Tolerant Job Flow Manager Using Job Flow Patterns and Recovery Policies.- Building Mashups for the Enterprise with SABRE.- Adaptation of Service Protocols Using Process Algebra and On-the-Fly Reduction Techniques.- Automatic Workflow Graph Refactoring and Completion.- Authorization and User Failure Resiliency for WS-BPEL Business Processes.- Reasoning on Semantically Annotated Processes.- Event-Driven Quality of Service Prediction.- Automatic Realization of SOA Deployment Patterns in Distributed Environments.- The LLAMA Middleware Support for Accountable Service-Oriented Architecture.- ubiSOAP: A Service Oriented Middleware for Seamless Networking.- Towards a Service-Oriented Approach for Managing Context in Mobile Environment.- An Autonomic Middleware Solution for Coordinating Multiple QoS Controls.- Transparent Runtime Adaptability for BPEL Processes.- Organizational Constraints to Realizing Business Value from Service Oriented Architectures: An Empirical Study of Financial Service Institutions.- E-Marketplace for Semantic Web Services.- Business Driven SOA Customization.- Sound Multi-party Business Protocols for Service Networks.- Automatic Mash Up of Composite Applications.- Non-desynchronizable Service Choreographies.- A Framework for Semantic Sensor Network Services.- Context-Driven Autonomic Adaptation of SLA.- Determining QoS of WS-BPEL Compositions.- An Initial Approach to Explaining SLA Inconsistencies.- Ontology-Based Compatibility Checking for Web Service Configuration Management.- SOAlive Service Catalog: A Simplified Approach to Describing, Discovering and Composing Situational Enterprise Services.- WorldTravel: A Testbed for Service-Oriented Applications.- TCP???Compose ??? - A TCP-Net Based Algorithm for Efficient Composition of Web Services Using Qualitative Preferences.- A Runtime Quality Architecture for Service-Oriented Systems.- QoS Policies for Business Processes in Service Oriented Architectures.- Deriving Business Service Interfaces in Windows Workflow from UMM Transactions.- From Business Process Models to Web Services Orchestration: The Case of UML 2.0 Activity Diagram to BPEL.- Batch Invocation of Web Services in BPEL Process.- Formation of Service Value Networks for Decentralized Service Provisioning.- Towards Automated WSDL-Based Testing of Web Services.- Automated Service Composition with Adaptive Planning.- A Planning-Based Approach for the Automated Configuration of the Enterprise Service Bus.- Verifying Interaction Protocol Compliance of Service Orchestrations.- Specify Once Test Everywhere: Analyzing Invariants to Augment Service Descriptions for Automated Test Generation.- A Model-Driven Approach to Dynamic and Adaptive Service Brokering Using Modes.- Integrated Security Context Management of Web Components and Services in Federated Identity Environments.- Predicting and Learning Executability of Composite Web Services.- Authorization Policy Based Business Collaboration Reliability Verification.- VGC: Generating Valid Global Communication Models of Composite Services Using Temporal Reasoning.- A Framework for Advanced Modularization and Data Flow in Workflow Systems.- Model Identification for Energy-Aware Management of Web Service Systems.- LASS - License Aware Service Selection: Methodology and Framework.- Integrated and Composable Supervision of BPEL Processes.- Optimised Semantic Reasoning for Pervasive Service Discovery.- COSMA - An Approach for Managing SLAs in Composite Services.- Resource Calculations with Constraints, and Placement of Tenants and Instances for Multi-tenant SaaS Applications.- SPIN: Service Performance Isolation Infrastructure in Multi-tenancy Environment.- Management as a Service for IT Service Management.- SMART: Application of a Method for Migration of Legacy Systems to SOA Environments.- Discovering and Deriving Service Variants from Business Process Specifications.- Market Overview of Enterprise Mashup Tools.- Siena: From PowerPoint to Web App in 5 Minutes.- Exploration of Discovered Process Views in Process Spaceship.- ROME4EU: A Web Service-Based Process-Aware System for Smart Devices.- WS-Engineer 2008.- MetaCDN: Harnessing Storage Clouds for High Performance Content Delivery.- Yowie: Information Extraction in a Service Enabled World.

Service-oriented computing - ICSOC 2008 : 6th international conference Sydney, Australia, December 1-5, 2008 proceedings

The increasing penetration level of photovoltaic (PV) power generation in low voltage (LV) networks results in voltage rise issues, particularly at the end of the feeders. In order to mitigate this problem, several strategies, such as grid reinforcement, transformer tap change, demand-side management, active power curtailment, and reactive power optimization methods, show their contribution to voltage support, yet still limited. This paper proposes a coordinated volt-var control architecture between the LV distribution transformer and solar inverters to optimize the PV power penetration level in a representative LV network in Bornholm Island using a multi-objective genetic algorithm. The approach is to increase the reactive power contribution of the inverters closest to the transformer during overvoltage conditions. Two standard reactive power control concepts, cosφ(P) and Q(U), are simulated and compared in terms of network power losses and voltage level along the feeder. As a practical implementation, a reconfigurable hardware is used for developing a testing platform based on real-time measurements to regulate the reactive power level. The proposed testing platform has been developed within PVNET.dk project, which targets to study the approaches for large PV power integration into the network, without the need of reinforcement.

/pdf/voltage-regulation-in-lv-grids-by-coordinated-volt-var-2o6xmc7ohq.pdf

Voltage regulation in LV grids by coordinated volt-var control strategies

A service-oriented approach that combines feature-oriented analysis with a self- managing quality-of-service framework addresses the challenges associated with dynamic software product lines.

Engineering Service-Based Dynamic Software Product Lines

The notion of software as a service promises agile, flexible and low maintenance system development through a dynamic runtime architecture that allows third-party functionality and capability to be added on demand. There is growing research interest in how service-orientation can be adopted a means for enhancing agility and flexibility in product line engineering. However, integrating service-orientation in product line engineering poses a number of challenges. These include difficulty in identifying services, ensuring services reflect user needs, and determining configurations of services that are relevant in different user contexts. This paper describes an approach for service-oriented product line development that integrates feature-oriented engineering with a self-managing consumer-centred negotiation process to address these challenges.

A consumer-centred approach for service-oriented product line development

System quality aspects such as dependability, adaptability to a changing runtime environment, and concerns such as cost and provider reputation, are increasingly important in a competitive software service market. Service-oriented system quality is not just a function of the quality of a provided service, but the interdependencies between services, the resource constraints of the runtime environment and network outages. This makes it difficult to anticipate how these factors might influence system behaviour, making it difficult to specify the right system environment in advance. Current quality management schemes for service-oriented systems are inadequate for ensuring runtime system quality as they focus on static service properties, rather than emergent properties. They also offer the consumer only limited control over the quality of service. This paper describes a novel consumer-centred runtime architecture that combines service monitoring, negotiation, forecasting and vendor reputation, to provide a self-managing mechanism for ensuring runtime quality in service-oriented systems.

/pdf/a-runtime-quality-architecture-for-service-oriented-systems-5z1heo69yi.pdf

A Runtime Quality Architecture for Service-Oriented Systems

Service-oriented system quality is not just a function of the quality of a provided service, but the interdependencies between services, the resource constraints of the runtime environment and network outages. This makes it difficult to anticipate how the consequences of these factors might influence system behaviour, which in turn makes it difficult to specify the right system environment in advance. Current quality management schemes for service-oriented systems are inadequate for assuring system quality as they rely largely on static service properties to predict system quality. Secondly, they offer the consumer only limited control over the quality of service. This paper describes a self-managing, consumer-centred approach based on a brokerage architecture that allows different monitoring, negotiation, forecasting and provider reputation schemes to be integrated into a runtime quality assurance framework for service-oriented systems. We illustrate our solution with a small service-oriented application.

A Self-Managing Brokerage Model for Quality Assurance in Service-Oriented Systems

Software product line engineering offers developers a low-cost means to rapidly create diverse systems that share core assets. By modeling and managing variability developers can create reconfigurable software product families that can be specialised at design- or deployment-time. Service-orientation offers us an opportunity to extend this flexibility by creating dynamic product-lines. However, integrating service-orientation in product line engineering poses a number of challenges. These include difficulty in i) ensuring product specific service compositions with the right service quality levels at runtime, ii) maintaining system integrity with the dynamically composed services, and iii) evaluating actual service quality level and reflecting this information for future service selections. In this paper, we propose a negotiation framework that alleviates these difficulties by providing a means of achieving the dynamic flexibility of service-oriented systems, while ensuring the user-specific product needs can be also satisfied.

Daniel Robinson

Papers

Engineering Service-Based Dynamic Software Product Lines

A consumer-centred approach for service-oriented product line development

A Runtime Quality Architecture for Service-Oriented Systems

A Self-Managing Brokerage Model for Quality Assurance in Service-Oriented Systems

A Negotiation Framework for Service-Oriented Product Line Development