Emmerich, W.

Finkelstein, A.

Guerra, S.

Takahashi, K.

English

UCL Discovery

System Development Using Application Services over the NetKenji TakahashiInformation Sharing PlatformLabs, NTT3-9-11 Midoricho, MusashinoTokyo 180-8585 Japankt@nttlabs.comWolfgang Emmerich, Anthony Finkelstein & Soﬁa GuerraDept. of Computer ScienceUniversity College LondonGower StreetLondon WC1E 6BT, UKfw.emmerichj a.ﬁnkelsteinj s.guerrag@cs.ucl.ac.uk1W H A T I S A S P ?An Application Service Provider (ASP) is an organizationthat delivers a variety of applications to multiple customersover a network. It deploys and manages application soft-ware, system hardware, and networking at a centralized fa-cility on behalf of the customers. Customers then pay a li-cense fee for being able to use these application services fora particular period of time, usually a month or a quarter.The promise of ASP is that by using application servicesover networks (the Internet, intranets, and/or extranets), asigniﬁcant part of system requirements can be met with, itis suggested, little need for initial developmentand recurringin-house maintenance effort.Recently more and more kinds of applications, such as ERPand messaging services, have become available on the In-ternet. At the same time, the pressure to downsizing forcesbusiness organizationsto outsource services in areas outsidetheir primary competence. These two trends have led to theincrease in ASPs. Although the ASP industry is very young,the use of ASP becomes popular as one of the key elementsto reduce the total cost of ownership(TCO) of systems. ASPhas attracted a lot of interest from a variety of communi-ties including users wishing to reduce information systemcosts, software vendors seeking to introduce their productsto wider range of customers, and network service providerswishing to increase trafﬁc and value derived from their ser-vice offerings. As we have been experiencing the transitionin mainstream from in-house to COTS-based developmentstyle, the next logical step will be ASP-based system devel-opment. The tutorial will be the ﬁrst to explore the emerg-ing ASP based system developmentparadigm and foster thisnew area of software engineering.2 TUTORIAL CONTENTThe aim of this tutorial is to give participants a detailed un-derstanding of the prospects for, and issues arising from, theemergingASP industry. In this tutorial, we give an overviewof the ASP industry and illustrate how ASP works in realsettings using case studies.The tutorial will cover the requirements that application ser-vices provided over networks need to meet. These are inparticular non-functional requirements and include security,reliability,scaleability,interoperability,ﬂexibilityandappro-priate performance.The tutorial will address different architectural options forASP. These options range over web-based client/server ar-chitectures (a web server is accessed through browser-basedclient interfaces), server based architectures (applicationcode is executed on the ASP host) and mobile-code archi-tectures (application code migrates from the ASP host to theclient and executes there).Architectures for ASP systems are built on enabling tech-nologies, which are discussed in the tutorial. Technologiesfor building web-based clients include XML and Java Ap-plets. Application servers are distributed systems and thetutorial will describe the different forms of middleware thatcan be used to simplify distribution and heterogeneity. Onthe server-side, Servlets and CGI scripts may be used andthe tutorial also discusses these.New formsof developmentprocesses will needto be used byASPs. The tutorial will describe a goal-oriented approach tospecifying services. We will then show how to match thesespeciﬁcations with requirements that customers may have.We will also discuss the selection of components that areused for service provisionand issues that arise from the inte-gration and possible interaction of components.The ability to provide application services of networks pro-vides an opportunity for new forms of businesses. The tu-torial will discuss the different models of these businesses,identify legal challenges for ASPs, such as responsibility,liability and accountability and identify how service levelagreements will be used to mediate between customer andservice provider.Finally the tutorial will identify some of the future prospectsand potential problems with application service provisionand analyze the cost beneﬁts.

System development using application services over the Net (tutorial summary)

City Research Online

              City, University of London Institutional RepositoryCitation: Takahashi, K., Emmerich, W., Finkelstein, A. ORCID: 0000-0003-2167-9844 and Guerra, S. (2000). System development using application services over the Net (tutorial summary). In: Proceedings of the 22rd International Conference on Software Engineering. (p. 830). IEEE Computer Society Press. ISBN 978-1-58113-206-9 This is the accepted version of the paper. This version of the publication may differ from the final published version. Permanent repository link:  https://openaccess.city.ac.uk/id/eprint/26479/Link to published version: Copyright: City Research Online aims to make research outputs of City, University of London available to a wider audience. Copyright and Moral Rights remain with the author(s) and/or copyright holders. URLs from City Research Online may be freely distributed and linked to.Reuse: Copies of full items can be used for personal research or study, educational, or not-for-profit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. City Research OnlineCity Research Online:            http://openaccess.city.ac.uk/            publications@city.ac.ukSystem Development Using Application Services over the NetKenji TakahashiInformation Sharing PlatformLabs, NTT3-9-11 Midoricho, MusashinoTokyo 180-8585 Japankt@nttlabs.comWolfgang Emmerich, Anthony Finkelstein & Sofia GuerraDept. of Computer ScienceUniversity College LondonGower StreetLondon WC1E 6BT, UKfw.emmerichj a.finkelsteinj s.guerrag@cs.ucl.ac.uk1 WHAT IS ASP?An Application Service Provider (ASP) is an organizationthat delivers a variety of applications to multiple customersover a network. It deploys and manages application soft-ware, system hardware, and networking at a centralized fa-cility on behalf of the customers. Customers then pay a li-cense fee for being able to use these application services fora particular period of time, usually a month or a quarter.The promise of ASP is that by using application servicesover networks (the Internet, intranets, and/or extranets), asignificant part of system requirements can be met with, itis suggested, little need for initial development and recurringin-house maintenance effort.Recently more and more kinds of applications, such as ERPand messaging services, have become available on the In-ternet. At the same time, the pressure to downsizing forcesbusiness organizations to outsource services in areas outsidetheir primary competence. These two trends have led to theincrease in ASPs. Although the ASP industry is very young,the use of ASP becomes popular as one of the key elementsto reduce the total cost of ownership (TCO) of systems. ASPhas attracted a lot of interest from a variety of communi-ties including users wishing to reduce information systemcosts, software vendors seeking to introduce their productsto wider range of customers, and network service providerswishing to increase traffic and value derived from their ser-vice offerings. As we have been experiencing the transitionin mainstream from in-house to COTS-based developmentstyle, the next logical step will be ASP-based system devel-opment. The tutorial will be the first to explore the emerg-ing ASP based system development paradigm and foster thisnew area of software engineering.2 TUTORIAL CONTENTThe aim of this tutorial is to give participants a detailed un-derstanding of the prospects for, and issues arising from, theemerging ASP industry. In this tutorial, we give an overviewof the ASP industry and illustrate how ASP works in realsettings using case studies.The tutorial will cover the requirements that application ser-vices provided over networks need to meet. These are inparticular non-functional requirements and include security,reliability, scaleability, interoperability, flexibility and appro-priate performance.The tutorial will address different architectural options forASP. These options range over web-based client/server ar-chitectures (a web server is accessed through browser-basedclient interfaces), server based architectures (applicationcode is executed on the ASP host) and mobile-code archi-tectures (application code migrates from the ASP host to theclient and executes there).Architectures for ASP systems are built on enabling tech-nologies, which are discussed in the tutorial. Technologiesfor building web-based clients include XML and Java Ap-plets. Application servers are distributed systems and thetutorial will describe the different forms of middleware thatcan be used to simplify distribution and heterogeneity. Onthe server-side, Servlets and CGI scripts may be used andthe tutorial also discusses these.New forms of development processes will need to be used byASPs. The tutorial will describe a goal-oriented approach tospecifying services. We will then show how to match thesespecifications with requirements that customers may have.We will also discuss the selection of components that areused for service provision and issues that arise from the inte-gration and possible interaction of components.The ability to provide application services of networks pro-vides an opportunity for new forms of businesses. The tu-torial will discuss the different models of these businesses,identify legal challenges for ASPs, such as responsibility,liability and accountability and identify how service levelagreements will be used to mediate between customer andservice provider.Finally the tutorial will identify some of the future prospectsand potential problems with application service provisionand analyze the cost benefits.

System development using application services over the Net (tutorial summary)

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