There are more and more incompatible systems with the growing number of services provided by computers. The user has to chose between expensive huge systems, offered by large companies like Microsoft or Oracle and losing competition. While these huge systems have a lot of possibilities, small and middle sized companies can only use a small portion of options offered there. With the increasing pressure from competitors, this forces users to choose other technologies like Web Services, in order to survive rivalry. WSDL (Web Services Description Language) was invented to describe Web Services in the most simple way there is. Web Service is a collection of protocols and standards used for exchanging data between applications or systems. Software applications written in various programming languages and running on various platforms can use web services to exchange data over computer networks like the Internet in a manner similar to inter-process communication on a single computer. In this work the methods are suggested for creation of stand-alone E-Commerce Hub and combining other systems into it. By the help of Web Services, users of Internet Stores, and other systems based on product and service data, are able to share their information with others through the E-Commerce Hub. It is easily automated and requires no maintenance.

Web services are widely used in banking, finance, insurance, tourism, e-business sectors and so on. Web services have emerged only recently, so the issues are typical for new technologies: ideas had arisen on technological level, and methods for modeling and development are coming only later. Existing development processes and notations such as Object-Oriented Analysis and Design (OOAD), Enterprise Architecture (EA) frameworks, and Business Process Modeling (BPM) provide us with capabilities to identify and describe appropriate architectural abstractions, but it’s not enough for realization of Service Oriented Architecture (SOA). In this work the methodology is proposed for design of stand-alone services and combining them into larger system. Proposed methodology joins main principles of Object-Oriented Analysis and Design, Enterprise Architecture frameworks, and Business Process Modeling. This methodology allows to describe service-oriented models using UML diagrams and to combine them with each other. Stages of designing stand-alone services are: business modeling, requirements analysis, identification of interfaces, analysis of interface interaction, specification of components, service model (WSDL diagram) design. Designing services systems consists of following steps: use case modeling, services identification, choreography modeling, business modeling and composite service modeling. The examples of proposed methodology for designing stand-alone services and combining... [to full text]

Šis darbas aprašo pagrindinius Grid paslaugų kūrimo metodus, kurie bando pasiūlyti operacinius suderinamumus, stabilumą ir produktyvumą, nepaisant to, kad pasaulinio tinklo paslaugos yra jauna technologija su keliais standartais. Tikimės, kad Grid paslaugos sukurtos iš pasaulinio tinklo paslaugų parodys vykdymo problemas, bent jau pradžioje, ir kad eksperimentavimas ir alternatyvų kūrimas, pareikalaus efektyvesnių pasaulinio tinklo paslaugų realizacijų. Pasiūlytas modelis sukurtas Grid architektūros pagrindu, taip išvengiant rizikos perkurti visą infrastuktūrą. / This work has described an approach to building Grid Services that attempts to promote interoperability, stability and productivity, despite the fact that Web Services are a young technology with few standards. We anticipate that Grid services built from Web Services will show performance problems, at least initially, and that experimentation and development of alternate, more efficient implementations of some of these Web Services will be necessary. Proposed model is based on existing Grid architecture, without the risk of rebuilding the whole infrastructure.