ServiceOriented Application Integration ServiceOriented Application Integration Enterprises share

Service-Oriented Application Integration

Service-Oriented Application Integration Enterprises share common application services and information ◦ Define application services they can share ◦ Provide infrastructure for application service sharing ◦ Examples: Sharing common logic to process customers’ credit Calculate shipping costs

Service-Oriented Application Integration Built on multitier client/server architecture ◦ ◦ Set of shared services on a common server Services may be reused Originally created for a single-organization use Allows for loosely coupled applications

Service-Oriented Application Integration Requires changes to most enterprise and B 2 B applications to take advantage ◦ Expensive proposition ◦ Concern about creating applications that share services not under direct control

Service-Oriented Application Integration Web Services ◦ Ability to access remote application services through a well-defined interface, directory, and transport protocol Web Services Description Language (WSDL) Universal Description, Discovery and Integration (UDDI) Simple Object Access Protocol (SOAP)

Web Services Description Language (WSDL) Provides a standard on interfaces between client and server ◦ Defines an XML grammar to describe network services ◦ Recipe to automate the way applications communicate

Universal Description, Discovery and Integration (UDDI) Set of databases where businesses register their Web services ◦ Allows other organizations to find Web service ◦ Understand how to access service programmatically ◦ Understand the interfaces employed

Web Services Locate the service using UDDI Determine the interface definition using WSDL Application services exposed by a company that are discoverable and accessible by other organizations ◦ Example: reserving a flight, calculating tariffs ◦ Discrete business services ◦ Value to many organizations

Web Services Web services tend to be created in a series of small, low risk steps Combine information and applications that exist in local and remote information systems ◦ Redundant application services at two or more systems ◦ New application need

Web Services Event-driven Web Services – architecture that deals more with information movement than application service aggregation EX: moving order information from system to system and company to support purchase of a car

Web Services Composite-application Solutions – architecture that requires many application services to aggregate into a single instance of an application

Web Services Autonomous-distributed Solutions – architectures where Web services are tightly coupled, appear as a single application ◦ Very future architecture

Web Services Missing Pieces ◦ No mechanism to leverage user interfaces ◦ Lack support for authentication, encryption and access control ◦ Lack ability to authenticate publishers or consumers of services

Application Integration Rule ◦ Agreed-upon set of conditions ◦ Example: employees may not fly first class on flights of less than 5, 000 miles ◦ Rules are built into applications to control information flow ◦ Rules can control the flow of information between enterprises

Application Integration Logic ◦ Sequence of instructions in a program ◦ Example: when button is pressed, pop up this screen ◦ Logic tends to be generated differently by different programmers, i. e. , form of art Sequential processing Selection Iteration

Application Integration Data ◦ Information that is shared between applications, computers, or humans Objects ◦ Data and business services bound as objects

Amazon. com Books? CD’s Technology Company?

Amazon. com Amazon Web Services ◦ Patented one-click purchasing system ◦ Tap quickly into sales data for particular products ◦ Merchants & developers can get free access to services ◦ Can use services from any outpost on the Web

Amazon. com May sell wares to 37 million customers assembled at Amazon. com Amazon takes a commission of 15% Is Amazon an on-line mall? Some of the retailers that use its ecommerce system ◦ ◦ Lands’ End Circuit City Store Target Corp Toys ‘R’ Us