Web Services the changing landscape of Application Software Development

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Web Services the changing landscape of
Application Software Development

• SCALA Bangalore
• June 18, 2004
• S Sadagopan, ss_at_iiitb.ac.in

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Session Overview

• Programming to architecture
• Functions to components
• Computers to appliances
• Computer networks to network as computer
• Projects to products to productized services
• Web services
• Software as service
• Summary

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Programming to Architecture

• Programming for self (random numbers)
• Programming for friends, community (Bell Labs)
• Programming for someone out there (GE to TCS)
• Project to product (Linux)
• Todays demands to tomorrows dreams (Xbox)
• Artisan to architect

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Functions to Components

• Subroutines (FORTAN)
• Functions procedures (Pascal, c)
• Libraries, Packages (c, c, Java)
• API (MFC, JFC)
• Components (Java Beans, COM components), CLR
• Domain-specific (EJB)

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Computers to Appliances

• Macro-processors (Mainframes)
• Master-slave (Terminals)
• PCs
• Client-server computing
• PDA, Cell phone, Palm, iPAQ, 3G, iPod, MP3
  Player, Digital camera, MPEG devices, Fridge,
  Treo

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Computer network to network is the computer

• LAN / WAN / Network O/S, Netware, Unix,..
• TCP/IP, HTTP, HTML, Browser, Web - universal
• Write once, deploy anywhere open system,
  cross platform, Java
• Scripting, plug-in, applet, servlet
• Client server, 3-tier, n-tier, middleware,
  application server (IBM, BEA, Sun, Pramati)

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Projects to products to productized services

• Customizable product software
• Enterprise software (ERP, SCM, CRM)
• Consulting, implementation services
• Configuring, customization services
• Integration services
• Development to system integration

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Web services - XML

• XML - Message-based RPC
• XML is to structure what HTML is to content
• It is NOT a language
• Extensibility is the key
• Knowing XML is NOT that useful knowing what you
  can do with XML is most useful
• mathXML, ChemXML, ebXML, XML for chess, music

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Web services - SOAP

• Object based universal protocol SOAP
• Object orientation is the key
• XML as payload SOAP as the envelope
• Applications over Net become a reality

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Web services - UDDI

• Service description discovery UDDI
• Way to publish discover
• Provides for intermediaries
• Discovery is automatic

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Web services

• Message-based RPC XML
• Object based universal protocol SOAP
• Service description discovery UDDI
• Web services as a way to deliver software
• Creates an ecosystem of software services
  developers, mediators, buyers, value-added
  retailers
• Very interesting applications - example

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Software as a Service

• Usage-based charging model (utility)
• New form of 3-tier (generation, transmission,
  distribution) with Grid in between
• Internet as grid devices as distribution
  appliances, service providers as generation,
  middleware as transmission
• New form of software services
• Architecture at the core of construction (J2EE
  .Net as possible architectures)

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Summary

• Software construction process is maturing
• There is a paradigm shift in the process
• Architecting will be a key source of
  competitive advantage for countries like India
• Skill-sets would be different Value chain will
  undergo transformation Like hardware system
  software, application software too will get
  layered
• Challenges for software companies are increasing!

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Summary

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