Web Service Composition Model Research Articles

Web Service Composition Automation based on Timed Automata

Web service composition is a new direction in the research of service computing. To promote the portfolio, the key problem is to achieve efficient and automatic composition process. We propose the web service composition model based on timed automata. In the computing framework, we design the formal model and its construction algorithm; provide a web service interface description language and composition automation engine. In order to validate its performance, using UPPAAL as the service composition simulator, realized the automation process from independent web services into composite ones. The experimental results verify the feasibility of automatic service composition and the effectiveness of the proposed configuration.

Researching the Model of Semantic Web Service Composition Based on Qos

At present, a single Web service provide function is very limited, which can't meet the real life complex application requirements, so need to combination the single Web service. This paper presents a model of semantic Web service composition based on QoS, non-functional attributes to quantify its service performance, makes service quality protocols can be set up between service providers and services requester, meet the quality of service of the service requester personalized needs.

A Research on the Web Services Composition Model and its Transformation Based on MDA

At present, the growing numbers of Web services are available for reuse. It is a valuable research topic that using the existing web services to create more complex web services. The process of creating more complex web services is actually the same to the process of service composition. In this paper, we propose a readable and easy transformed web services composition model based on the profile of Unified Modeling Language (UML). We also implement the transformation from the composition model to Business Process Execution Language (BPEL) based on Model Driven Architecture (MDA).

Web Service Composition Optimization Based on Improved Artificial Bee Colony Algorithm

Web service composition is a hot and active research area in service oriented architecture (SOA). With highly developing of Web service, users pay more and more attention to quality of service (QoS). In order to obtain high comprehensive quality composite services, an optimizing method was presented in this paper. Firstly, build representative QoS properties quantitative models and QoS aggregation models, then proposed the mathematical model of Web service composition optimizing problem. Secondly, presented an improved artificial bee colony algorithm (I-ABC) and applied to solving Web service composition optimizing problem, I-ABC performance was enhanced by importing taboo strategy and chaos. Finally, some simulation experiments are given, and the results proved I-ABC has perfect performance in Web service composition optimizing than ABC

Privacy-aware RBAC model for web services composition

Web services collaborative environments are highly automatic, dynamic, and heterogeneous. These characteristics always lead to high risks of services for interaction participants. Hence, it becomes one of the most important things to guarantee that the private information in cross-domain services is not illegally collected, used, disclosed or stored when the Web services are required to combine secure composition. This paper proposes the privacy-aware role based access control model for Web services composition (WSC-PRBAC), which provides protection for private data of users in composite service. The element services are divided into local services and outside services. Because the local service is authorized by users, it is exactly different from other services in the composition. To avoid sending private information to other outside services directly, we define global roles to help access these data in local service. Using global roles can realize a more strict control of the private data. In the end, the experiment and analysis of the proposed model show its and efficiency.

Formal Modeling of Trust Web Service Composition Using Pi-calculus

To enhance the credibility of Web service composition, Pi-calculus based formal modeling of trust Web service composition is proposed. Trust Web service composition is firstly defined abstractly; then Pi-calculus is used to depict structure and internal interaction of Trust Web service composition, the mapping relation between trust entity and Pi-calculus is provided. Automatic reasoner MWB is adopted to analyze and reason the Trust Web service composition system, which is aimed at finding and correcting the faults before the implementation of trust authentication of Web service composition. It thus meets the users’ demands on trust quality effectively. DOI: http://dx.doi.org/10.11591/telkomnika.v11i8.3039

A Community Based Algorithm for Large Scale Web Service Composition

Web service composition is the process of synthesizing a new composite service using a set of available Web services in order to satisfy a client request that cannot be treated by any available Web services. The Web services space is a dynamic environment characterized by a huge number of elements. Furthermore, many Web services are offering similar functionalities. In this paper we propose a model for Web service composition designed to address the scale effect and the redundancy issue. The Web services space is represented by a two-layered network architecture. A concrete similarity network layer organizes the Web services operations into communities of functionally similar operations. An abstract interaction network layer represents the composition relationships between the sets of communities. Composition synthesis is performed by a two-phased graph search algorithm. First, the interaction network is mined in order to discover abstract solutions to the request goal. Then, the abstract compositions are instantiated with concrete operations selected from the similarity network. This strategy allows an efficient exploration of the Web services space. Furthermore, operations grouped in a community can be easily substituted if necessary during the composition's synthesis's process.

The Performance Analysis of Web Service Composition Based on Timed Colored Petri Net

On the premise of meeting functional requirements, the performance of web service composition is key to customers. Therefore, performance modeling of web service composition has been an important research direction of reengineering. Time coloured Petri net (TCPN) can not only establish a simulation model for system behaviour, but also extract or collect many performance analysis results from the model combined with predefined data monitors, which can satisfy user demands for the performance of QOS, and solve the problems which stochastic process algebra and queue network suffer when analyzing system performance.

Case Study on Web Service Composition Based on Multi-Agent System

Rapid development of the Internet and increasing number of available Web services has generated a need for tools and environments facilitating automated composition of atomic Web services into more complex Web processes. However ,reasoning optimization and utilization in such AI related solutions is still an open problem .In this paper, we proposed a novel multi-agent based semantic web service composition model(SWSCPA) which exploits the relationships among different service consumers and providers, together with the corresponding optimization approach to strengthen the effectiveness of Web service composition. We argue that agents and web services are distinct. In our work, agents provide a distinctive additional capability in mediating user goals to determine service invocations. Through the model, an optimization method was proposed based on the substitute relationship and the dependency relationship. The case study and experimental analysis demonstrates the capability of the proposed approach.

A GEOSPATIAL WEB SERVICES COMPOSITION FRAMEWORK SUPPORTING REAL-TIME STATUS MONITORING

Abstract. Geospatial web services composition becomes one of the main solutions for complex computing in the GIS realm with the development of information interoperability and advanced IT technologies. Standard geospatial web services only have two simple statuses: success or failure. However the procedures for geospatial information processing and analysis always feature intensive data, complex computation, and long processing times. Thus, standard geospatial web services composition only provides basic functions and cannot fully satisfy geospatial information processing and analysis needs. The problems with standard geospatial web services are numerous, including difficulties in controlling and monitoring geospatial web services, composition optimization, and error tracking. The execution status of geospatial web services composition must be monitored becoming the basis for further optimization of the geospatial web services composition model. This paper proposes a framework for geospatial web service composition that supports real-time status monitoring. This framework effectively integrates geospatial web services with status interfaces and dynamic monitoring technology. Experiments show that this framework can effectively monitor execution information, reminding users of bottleneck information thus providing the foundation for further improvements in the model's execution efficiency.

CSP Based Web Service Composition Model with Buffer at the Business Logic Process Level

This research aims to efficient and practical interface handling of web service. Therefore we propose web service composition model at the business logic process level. Business logic process is a unit of web service. When the web service consumer requests to service to web service on the internet, business logic process in the service performs practically. To consider their interface for business logic process, the business logic process buffer was used. To get information of web service composition, transaction service in our model manages them to composition database. And we design this model specification by formal method, CSP, for practically and accurately interface behavior.

An Efficient Ontology-based Semantic Web Services Composition Model for Peer to Peer Work

An Efficient Ontology-based Semantic Web Services Composition Model for Peer to Peer Work

Research on Verification Tool for Software Requirements

To verify the software requirements of network software, a verification tool OWLSVerifyTool is proposed, designed and developed to deal with model checking of Web service composition model in this paper. It can convert OWL-S documents into Petri nets document and then analysis and verify it in Petri nets with engine in dynamic context. While compositing the DL reasoning engine Pellet and F-logic-based reasoning engine Flora-2, it can play their respective advantages to reason and verify static model in static context of software requirement. The automated validation tool can effectively verify software requirement meta-model based on Web service described with OWL-S.

An Approach to Reliability Evaluation of Web Services Composition Based on BPEL

Aiming at the deficiency of research on reliability evaluation of Web Services composition models, basing on the theories and methods of stochastic Petri net, this paper proposes an approach to reliability evaluation of web services composition based on business process execution language (BPEL). Firstly, the Web Services composition model is analyzed and built basing on the stochastic Petri net, and then the BPEL processes are transformed into composite service process Net model (CSPNet) correspondingly. Combining with the reliabilities of component services and the structures of CSPNet, the reliability formula of several composite services are obtained. Finally, a recursive algorithm is built to evaluate the reliability of Web Services composition. The experimental results show that the approach to reliability evaluation of web Services composition based on BPEL is simple, tractable and efficient.

Constrained evolutionary computing approach to Web service compositions

Web services are being adopted as a viable means of accessing Web-based applications. Web services are not only used to exchange information between enterprises but also to help software developers provide value-added services for various demands. Web service compositions are synthesised by researchers from elementary Web services, offering the opportunity for service providers and application developers to create value-added services. However, a problem exists in the current distribution process of Web service compositions: the general analysis and selection of services can be overly complex and are completed manually. Therefore, there is a need to manage composite Web services automatically. But the research related to ranking candidate services and selection of optimisation strategies is sparse. Yet, few have been published that consider the constraints of non-functional properties. In this article, a systemic but autonomous composition process has been proposed. This study proposes an evolutionary approach that applies the characteristics of the object-oriented concept of Web services and the genetic algorithm to effectively manage and optimise the Web service composition. It is capable of escaping not only from local optima due to a population-based approach, but also from unbiased nature, which enables it to perform well in a situation with little domain knowledge. In this article, the related literature is reviewed. Then, the Web service composition model incorporated with a genetic algorithm is proposed. Finally, a practical implementation is illustrated and shows a good result in terms of solution quality.

Research on Context-aware Web Service Composition based on the Fluent Calculus

With the exponential growth in available web services and diversity of user needs, automatic web service selection and composition techniques have attracted the attention of many researchers. This paper presents a fluent calculus-based, context-aware web service composition model. The model uses an artificial intelligence (AI) planning-based web service composition technique, which translates web service composition problems into AI planning problems, and then achieves target goals by acquisition and reasoning using existing environmental knowledge. We first construct a model for service, service context, and service composition on the basis of the fluent calculus theory. Then, we extend the basic axioms of the fluent calculus (initial state and state update axioms) to describe context information, an approach that endows context-aware ability to the fluent calculus-based web service composition. Furthermore, we implement a fluent calculus-based, context-aware web service composition model using a fluent calculus executor or FLUX in a digital tourism service scenario. The experimental results show that the proposed model has context-aware capability and exhibits better performance in service composition.

A Quality of Service Broker Based Process Model for Dynamic Web Service Composition

Problem statement: With fast spreading of web services technology ove r the Internet, the quality aspects of a web service has received signi ficant attention to the practitioners. The quality of web service includes both functional and nonfunctio nal details. In order to provide the correct and meaningful information to web service consumer, sometimes there is a need to compose existing web services in order to create new web service. Approach: We have proposed a Quality of Service (QoS) broker based process model for Dynamic Web Service Composition (DWSC). The QoS broker in the proposed model is responsible for web servic e collection, selection, optimization and composition based on the service consumer's require ments. It also verifies and certifies the functiona l and QoS specifications provided by service provider at the time of web service registration before publishing it in Universal Description, Discovery a nd Integration (UDDI) registry. The detailed working of QoS broker is also presented in the stud y with functionality of each component. We will also discuss the process flowchart for new web serv ice registration and web service composition at runtime. Results: The proposed QoS broker based model for dynamic web service composition solves the problems associated with quality of web service. It also prevents the central repository from malicious service provider to publish wrong in formation. Conclusion: The QoS broker-based process model for dynamic web service composition guarantees the quality of delivered service to web service consumers and improve the efficiency of composition.

An Efficient Web Service Composition Method Based on the Price-Time Petri Net

At present, developers can rapidly generate applications through Web service composition, the quality of service (QoS) of web service composition is important, but most of the existing composition methods are difficult to balance the QoS indexes (Such as time and price). In this paper, a web service composition method based on the price-time Petri net is proposed, the minimum cost can be obtained by modeling based on price time Petri net, and presents a method of priced state class to analyze the cost of web service composition model. Theoretical analysis and case analysis show that the price-time Petri net method is feasible to study Web service composition with the minimum cost.

Service Selection Constraint Model and Optimization Algorithm for Web Service Composition

Service Selection Constraint Model and Optimization Algorithm for Web Service Composition

Algorithm for Web Service Composition using Multi Agents

term Web Services describes a standardized way of integrating Web-based applications using the XML, SOAP, WSDL and UDDI open standards over an Internet protocol backbone. Merely providing services to the users in the heterogeneous distributed environments, service oriented systems are very important. Most of the time, the individual services do not have the sufficient conditions to provide any services to the users. In order to resolve the aforementioned problem, one may compose several individual services together. The proposed method currently applied to ensure the robustness and dependability of Web Services compositions do not effectively map to more open dynamic environments. The proposed approach has a new multi-layer Web Services composition model based on Multi-Agent System. We propose a different self-adaptive mechanisms corresponding to different environment's evolutions to improve the reliability of Web Services composition efficiently. Also we introduce an algorithm for dynamic approach to select the best composition. This composition is selected based on the quality and the compose-ability of participated services. Advantage of the proposed approach is to recognize the feasibility of the composition process at any point of execution and produce better throughput and a less consumption of memory to select composition of services dynamically. General Terms: Information systems, Algorithm.