Web Services

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Web Services

• Igor WasinskiOlumide Asojo
• Scott Hannan

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What are Web Services ?

• Web Services are a set of communication
  protocols and technical standards -- HTTP, Simple
  Object Access Protocol (SOAP), Universal
  Description Discovery and Integration (UDDI) and
  Extensible Mark-up Language (XML) -- that enable
  applications to share information via the
  Internet. Web services enable more efficient
  application-to-application integration and form
  the foundation of service-oriented
  architectures.
• http//www.ebstrategy.com/services/service_arch/se
  rv_arch_faq.htm

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Web Services

• A method of making various applications
  communicate with each other automatically over
  the Internet. (Laymans term.)
• Source
• www.ncipher.com/investors/glossary.php

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Why Use Web Services ?

• To provide easy online self service to customers
• To provide a wider variety of products and
  services with minimal overhead i.e. lower
  operating costs.
• Better handling real time transactions with
  customers. E.g. Cell Phone activation
• Application integration within and across
  organizational boundaries.

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More Benefits of Web Services

• Open the door to new business opportunities by
  making it easy to connect with partners.
• Deliver dramatically more personal, integrated
  experiences to users via the new breed of smart
  devicesincluding PCs.
• Save time and money by cutting development time.
• Increase revenue streams by easily making your
  own Web services available to others.

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Web Services in the organization

• For web services to meet business demands of a
  company, service blueprint needs to be created.
• A key objective of any self-service blueprint is
  to align the business strategy, process, and
  applications.
• Every self-service blueprint is conceptually
  segmented into four layers

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Service Blueprint Layers
http//www.awprofessional.com/articles/article.asp
?p102153
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Service Blueprint Layers

• The focal point layer defines the real business
  impact that needs to be accomplished.
• The services layer defines the critical composite
  processes that support the focal point. Customers
  prefer to deal with holistic end-to-end
  processes, not piecemeal fragments.
• The process layer is where the core business
  processes are defined and then digitized, using
  various applications to implement new customer
  experiences and support the services strategy.
• The integrated enterprise applications layer is
  the foundation and infrastructure of a
  businessthe technology plumbing and wiring that
  links the systems, databases, and applications.

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Practical Side of Web Services

• There are four main issues that organizations
  need be aware of before they considering the
  adoption or implementation of web service
  technology. These issues are Design, Development,
  Scalable Deployment and Support.

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Design Issues

• Scalability and Availability Web Services and
  Applications have to deal a large number of user
  and must be designed to as such. One popular
  design is using Clusters or Grid
• Invocation and Run-Time Instantiation Web
  service applications need to be carefully
  designed to run in multi-tenant mode or be
  deployed with a dedicated instance if it is
  intended for use by several user groups.

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Development

• Configuration Management Clear guidelines and
  policies are needed for assignment, tracking and
  management of unique version numbers for each
  software build.
• Composition Management Since most web service
  applications are made up of simpler web services
  which may be physically hosted on different
  machines on the net and can be from a variety of
  service providers it is very important to keep
  track of what services are being used

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Deployment of Web Services

• Monitoring service level agreements (SLA) for
  web services is more complicated than other
  classical types of software because of the fact
  that web services are composed of other services
  each with its own individual SLA.

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Support Issues in Web Services

• Deployment Support It is important to have a
  well defined methodology to deploy patches and
  fixes.
• Provisioning This involves turning on and
  turning off services
• Network Identity It is important for each user
  to have a unique identity.
• Security Authentication, authorization,
  auditing and encryption should be key issues and
  need to be well supported

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Questions

• ?